Manganese superoxide dismutase variants and uses thereof

Abstract

The present invention concerns variant proteins of manganese superoxide dismutase (MnSOD) and uses thereof. In particular, the invention concerns a short variant of recombinant MnSOD, and uses thereof for treating or preventing tumors, as well as for treating or preventing diseases with an etiology relating to an excess of free radicals.

Claims

1. A protein encoded by the nucleotide sequence of SEQ ID NO: 3.

2. The protein according to claim 1, produced by a process comprising expressing the nucleotide of SEQ ID NO: 3 in an E. Coli host cell.

3. A protein comprising the amino acid sequence of: SEQ ID NO: 4.

4. The protein according to claim 3, further comprising a TAG sequence.

5. A method for treating or diagnosing a disease characterized by an excess of free radicals, comprising administering an effective amount of the protein according to claim 1 to a patient in need thereof.

6. The method according to claim 5, wherein said disease belongs to the group consisting of vascular disease, including heart, coronary artery or peripheral vascular disease, dilated cardiomyopathy, aneurism, cancer, chronic obstructive pulmonary disease or COPD, dementia, and neurodegenerative disorders, aging, diabetes, autoimmune disorders with rheumatoid arthritis, ocular disease, a disease of the retina or of the crystalline lens, cataract, liver cirrhosis, and non-alcoholic steatohepatitis (NASH).

7. A method for treating a neuroinflammatory disease, comprising administering an effective amount of the protein according to claim 1 to a patient in need thereof.

8. The method according to claim 7, wherein the neuroinflammatory disease is a neurodegenerative disease.

9. The method according to claim 8, wherein the neurodegenerative disease is selected from the group consisting of: Alzheimer's disease, Parkinson disease, Multiple Sclerosis, Depression, Basal Ganglia diseases, Atherosclerosis, Stroke, Trauma, Substance use disorders, Amyotrophic Lateral Sclerosis, and Mitochondrial Encephalopathies.

10. A method for treating or diagnosing a tumor pathology, either alone or in combination, as enhancer, with other therapies, comprising administering an effective amount of the protein according to claim 1 to a patient in need thereof.

11. The method according to claim 10, wherein the tumor pathology is a leukemia.

12. The method according to claim 10, wherein the tumor pathology is a neuroblastoma.

13. A method for treating cataracts, comprising administering an effective amount of the protein according to claim 1 to a patient in need thereof.

14. A method of treating damage induced by a sublethal dose of proton irradiation, comprising administering an effective amount of the protein according to claim 1 to a patient in need thereof.

15. A nucleotide sequence coding for the protein as defined in claim 3.

16. A vector able to efficiently express the protein as defined in claim 3, wherein the vector comprises the nucleotide sequence of SEQ ID NO: 3.

17. A host cell engineered with the vector according to claim 16.

18. A pharmaceutical composition comprising the protein according to claim 1, and suitable excipients, diluents and/or carriers.

19. A kit for the diagnosis of a tumor disease comprising the protein according to claim 1.

20. The method according to claim 11, wherein the leukemia is acute lymphoblastic leukemia.

21. A method of producing the protein according to claim 3, comprising culturing a host cell expressing the nucleotide sequence of SEQ ID NO: 3, and purifying the produced protein comprising the sequence of SEQ ID NO: 4.

Description

FIGURE LEGENDS

(1) The present invention will be illustrated with non-limiting examples in reference to the following figures.

(2) FIG. 1 and FIG. 2: oct microperimetrical examination highlighted in the retina a spot that assesses retinal sensitivity to light stimulus by zone from red 0 to green 16, indicating a good response of the retinal area. For this patient, before treatment there was only one green zone (FIG. 1) and the majority were red zones. After one year of treatment consisting in the administration of 2 eye drops containing rMnSOD long form (100 ug/10 ml) twice a day the green areas were five (FIG. 2). The area of interest is the same as the picture that shows the condition of the patient before treatment. By overlapping the photos, it is possible to observe their perfect match. This demonstrates that it is the same retinal area that is photographed after a lap of time and also demonstrates the proper execution of the examination and its reliability.

(3) FIG. 3: (A) Eyes of rabbits exposed to ultraviolet radiation for 60 minutes, treated with the MnSOD long form: the crystallines are structurally intact. (B) Eyes of rabbits exposed to ultraviolet radiation for 60 minutes, treated with comparative MnSOD w.type: the lenses are destroyed.

(4) FIG. 4: Proliferation assay and growth inhibition. Survival of T-ALL cells, Jurkat cells and lymphocytes, by using MTT analysis, after 72 hours of growth, and following treatment with 0.067 M rMnSOD long form for 5 hours.

(5) (A) Cell viability by Trypan Blue exclusion assay. Results are the average of three independent experiments.

(6) (B) Spontaneous proliferation curve of Jurkat cells line, T-ALL and lymphocytes after 96 hours of growth.

(7) FIG. 5: Effect of rMnSOD long form on apoptosis induction. (A) FACS analysis after double labeling of Jurkat cells with PI and Annexin V following treatment with 0.067 M rMnSOD long form, compared to the control. (B) Distribution of Jurkat cells in the different phases of the cell cycle after treatment with 0.067 M rMnSOD long form.

(8) FIG. 6: (A) Percentage of labeled cells at light microscopy. (B) Percentage of labeled cells in Trypan Blue test after the treatments with the different concentrations of rMnSOD long form for 5 hours. The controls displayed no labeling.

(9) FIG. 7: (A-F) Jurkat cells treated with increasing concentrations of rMnSOD long form. All cells of the panel display an intense brown cytoplasmic and nuclear immunoreaction to anti-rMnSOD, revealed by diaminobenzidine reaction: A) 0.0067 M rMnSOD long form produces only mild pre-apoptotic changes such initial nuclear and cytoplasmic fragmentations, while 0.067 M rMnSOD long form (B, C, D, E) lead to a clear and advanced apoptotic fragmentation both a t nuclear and cytoplasmic level and finally 0.67 M rMnSOD long form (F) is a concentration that, very likely, exceeds the capacity of the cell redox, leading to plasma membrane ruptures.

(10) (G-J) Lymphocytes treated with increasing concentrations of rMnSOD long form. All cells display an intense brown cytoplasmic and nuclear immunoreaction to anti-rMnSOD, revealed by diaminobenzidine reaction: G) control cell; H) and I) cells respectively treated with 0.0067 and 0.067 M rMnSOD long form, showing a condition of well-being without any signs of apoptosis; J) cell treated with 0.67 M rMnSOD long form displaying plasma membrane rupture. Very likely, this is a concentration that exceeds the capacity of the cell redox.

(11) FIG. 8: Apoptotic index. Percentages of apoptotic Jurkat cells following rMnSOD long form treatments.

(12) FIG. 9: (A-F) Jurkat cells by TEM following immunoreaction with anti-rMnSOD long form revealed by 15 nm colloidal gold particles: A-B) cell treated with 0.0067 M rMnSOD long form showing an initial pre-apoptotic nuclear incision and slight cytoplasmic fragmentation; C) and D) cell treated with 0.067 M rMnSOD long form which lead to a clear nuclear and cytoplasmic apoptotic fragmentations; E-F) cell treated with 0.67 M rMnSOD, that shows membrane rupture. (G-L) Lymphocytes treated with increasing concentrations of rMnSOD long form respectively followed by immune-revealing with anti-rMnSOD long form and 15 nm colloidal gold particles. G) and H) Control cells; I) and J) lymphocytes treated with 0.067 M rMnSOD long form displaying a well-being condition while in K) and L) lymphocytes treated with 0.67 M rMnSOD long form show cell damage.

(13) FIG. 10: Western Blot Assay and software analysis of proteins expression: T-ALL cells (A), Jurkat cell line (B) and lymphocytes (C) were processed for the determination of Bcl-2, Bax, the phosphorylation of ERK and AKT after rMnSOD long form treatment at a final concentration ranging from 0.0067 to 0.67 M. The experiments were performed at least three different times and the results were always similar. UC: untreated cells. Scan of the bands associated with expression of Bcl-2, Bax, pERK and pAKT in T-ALL (D), Jurkat (E) and lymphocytes (F) normalized with the house-keeping protein, was performed with a dedicated software and the intensities of the bands were expressed as arbitrary units (%, mean of three different experiments).

(14) FIG. 11: Spectrofluorimetric analysis of reactive oxygen species. (A) Control Jurkat cells treated with or without NAC. (B) Jurkat cells pre-incubated with or without NAC and then with rMnSOD long form. Results are the means of three experiments.

(15) FIG. 12: The effect of rMnSOD long form was investigated by an in vitro model of cell culture (Neuroblastoma SK-N-BE cell line). The recombinant protein was rapidly internalized by neuron-like cells with sign of toxicity after 5-6 hr in culture. Pictures show an altered cellular morphology after rMnSOD long form treatment. A) Untreated cells; B) Cells administered with rMnSOD long form, after 1 h, show round shapes due to retraction of cytoplasm in comparison with control cultures (A); C) Cells exposed to rMnSOD long form show ongoing cell death features after 6 h treatment; Phase-contrast microscopy 40 magnification.

(16) FIG. 13: rMnSOD long form is internalised by undifferentiated and differentiated SK-N-BE after 1 h of treatment. Pictures show the intracellular localization of the recombinant protein immunostained with anti-rMnSOD long form polyclonal antibody. rMnSOD long form is in green, nuclei are blue. A) and B) Undifferentiated cells; C) and D) Differentiated cells; phase-contrast microscopy (A, C); fluorescent microscopy (B, D); 40 magnification.

(17) FIG. 14: rMnSOD long form administration modulates cytokines expression in brain cortex. A) Simultaneous detection of multiple cytochines by the Abcam Membrane Antibody Array provides a powerful tool to screen inflammatory factors unravelling the role of individual factors in physiologic or pathologic processes. The membranes were probed with brain cortex homogenates dissected from rMnSOD long form treated and control mice. B) The Graph represents the comparison of the percentage of expression of 40 inflammatory factors detected in test vs untreated samples (n=8). The picture shows a wide down-regulation of the inflammatory proteins in rMnSOD long form treated mice with significant decrease of 4 cytokines (red bars) listed in the table (C). Moreover, 4 proteins showed a trend of expression decrease borderline of reaching any statistical significance (green bar): Only one protein shows a slight, not statistically significant tendency to increase after rMnSOD long form treatment (C). (D) summary table of the results.

(18) FIG. 15: LDH release into the culture supernatant, expressed as percent of total LDH (from cell lysis induced by detergent treatment). Approximately 3% LDH was found in the medium of untreated cultures. rMnSODs were tested for their cytostatic and cytolytic effects on other human mammary epithelial cell lines of normal (MCF-10) or tumor (MCF-7) origin and on a variety of non mammary transformed cells (OVCAR-3, MiaPaCa, A-375). rMnSOD long form Mancini induced MCF-7 cell culture to release 97% of their LDH content into medium (as compared to the artificial LDH-release induced by detergent treatment), whereas very lower increase in LDH activity could be detected in MCF-10 cell culture supernatants upon application of this recombinant protein versus 12.20% of comparative rMnSOD (Abcam) and 7.30% of comparative rMnSOD (Sigma). The tumor-derived MIA PaCa-2, OVCAR-3, A375 cells all showed a striking sensitivity to rMnSOD long form Mancini-induced killing.

EXAMPLE 1: PRODUCTION OF SP24-MNSOD_SINT (RMNSOD LONG FORM) AND SP6-MNSOD_SINT (RMNSOD SHORT FORM)

(19) Two recombinant synthetic proteins were prepared. The first carrying the leader peptide of 24 aa, the second one, carries, the leader peptide composed of 6 aa. Both proteins exert the same effect/function.

(20) Protocol of Production and Purification of Recombinant Protein rMnSOD Short (Coding Sequence of 639 bp) and rMnSOD Long (Coding Sequence of 693 bp).

(21) Two different nucleotide sequences encoding the rMnSOD, different in the length of the N-terminal end of the protein, respectively rMnSOD short (639 bp) and rMnSOD long (693 bp) were cloned into the expression vector pET21a+(Novagen) using the restriction sites EcoRI to 5HindIII and 3. Specifically the two synthesized gene sequences are SEQ ID NO: 1 for the nucleotide sequence of rMnSOD long (amino acid sequence of rMnSOD long is SEQ ID NO: 2) and SEQ ID No. 3 for the nucleotide sequence of the short rMnSOD (amino acid sequence of rMnSOD short is SEQ ID No. 4).

(22) The resulting recombinant constructs (pET21a+_rMnSOD short and pET21a+rMnSOD long) have been transformed into BL21 cells (Novagen) according to the protocol provided by the manufacturer.

(23) The cells transformed with each of the constructs were inoculated in LB medium (Luria-Bertani) supplemented with Ampicillin (100 mg/ml) in flasks incubated at 37 C. under stirring until reaching an optical density of between 0.4-0.8 OD/ml.

(24) The expression of each of the recombinant proteins was induced by addition of 0.1 mm IPTG (Isopropyl--D-1-thiogalactopyranoside) incubating the culture at 25 C. under stirring. After 4 hr of growth, the culture is stopped and the cells separated from the culture medium by centrifugation.

(25) The cell pellets are re-suspended in T7Tag Bind/Wash Buffer (provided by the kit purification T7Tag Affinity Purification Kit, Novagen) and subjected to sonication.

(26) The cell lysate was then loaded onto a column T7Tag Antibody Agarose (provided by the kit purification T7Tag Affinity Purification Kit, Novagen) and purified according to the specifications given by the manufacturer.

(27) The solution containing the purified protein is sterilized by filtration in sterility with filters with cutoff of 0.22 m. The wild-type SOD bovine protein was purchased from SIGMA (code S 969715KU).

EXAMPLE 2: CYTOTOXIC EFFECT OF SYNTHETIC SP24-MNSOD ON HUMAN TUMOR CELLS IN CONTINUOUS CULTURE, AS ASSESSED BY LDH RELEASE FROM TUMOR CELLS AFTER INCUBATION WITH THE PROTEIN OF THE PRESENT INVENTION

(28) Materials and Methods

(29) Cells

(30) The cells used for the assessment of the cytotoxic activity of the recombinant protein derived from the synthetic gene are the following and have been obtained from the sources indicated below.

(31) MCF-7 cells (human breast carcinoma) from ATCC HTB-22, A-2780 (human ovarian carcinoma cells) from the European Collection of Cell Cultures (ECACC, Salisbury, Wiltshire, UK), Huh7 (human hepatoma cells by JCRB043 NIBIO JCRB Cell Bank, National Institute of Biomedical Innovation), DU145 (cells of human prostate cancer) from ATCC HTB 81 and finally the A375 (human melanoma cells) from the ATCC CRL 1619, MiaPaCa-2 (ATCC-CRL-1420, OVCAR-3 (ATCC-HTB-161), MCF-10(ATCC-CRL-10317).

(32) All cells were grown in Eagle culture medium modified by Dulbecco, and supplemented by 10% fetal calf serum and kept in incubator at 37 C. in a humidified atmosphere.

(33) Cytotoxicity Assay

(34) Cell lysis induced by the recombinant protein sp24-MnSOD was measured through the release of the enzyme lactate dehydrogenase (LDH). The protein was added to the cells MCF-7, A-2780, HUH-7, DU-145, A375 in exponential growth at a concentration ranging from 0.06 and 1 M. The release of LDH in the supernatant culture medium was quantified at different times (24 h), using the Cytotox 96 non-radioactive cytotoxicity assay kit from Promega, according to the instructions provided by Promega. The experiments were performed in triplicate, using different preparations.

(35) Results

(36) TABLE-US-00004 TABLE I Cytotoxic effect of sp24-MnSOD (rMnSOD long form) on human cancer cells LDH release (SP24-MnSOD- LDH release Cells Synthetic) W.Type SOD. (SIGMA) MCF-7 90% 7% Ca breast A2780 95% 3% Ovarian Ca HUH-7 77% 4% HCC A375 78% 5% Melanoma DU145Prostate Ca 76% 4%

(37) After 24 hours of incubation of sp24-MnSOD at a concentration of 1.5 M, the release of the enzyme lactate dehydrogenase from the cells indicates a cytotoxicity and therefore a mortality that varies, depending on the cells. What is very noticeable is that the wild-type protein exerts a cytotoxic activity very weak compared to that of the protein sp24-MnSOD.

(38) The same effect was observed with sp6-MnSOD (rMnSOD short form).

EXAMPLE 3: ASSESSMENT OF MANGANESE PRESENT IN SP24-MNSOD-SYNTHETIC (OR RMNSOD LONG FORM) COMPARED TO THE AMOUNT EXPRESSED BY THE WILD-TYPE MNSOD, BY ATOMIC ABSORPTION SPECTROPHOTOMETRY

(39) Materials and Methods

(40) The Manganese Superoxide (hMnSOD) is a mitochondrial metal enzyme and consists of 4 identical monomer units composed of 22 kDa. Each monomer contains, at the center of the molecule, a Manganese (II)/(III) ion which is surrounded by a trigonal pyramid linked to three histidine residues, an aspartate residue and a solvent molecule (Jan-Ling Hsu, et al., 1996, Karuppiah Chockalingam, et al. 2006).

(41) Manganese is commonly quantified by an examination of atomic absorption spectrometry. The measurement is performed using a graphite furnace equipped with a correction of background with Zeeman effect. A pyrolytic pipe coated with graphite THGA (Perkin-Elmer) placed on an integrated platform, Lvov-type, was used to quantify the metal. A normal solution of Mg in 2.5% HNO.sub.3 (Spectrascan) was used as a mother solution for the construction of the calibration curve at 3 points. Each measurement was carried out in triplicate. A modifying matrix was added (0.015 mg Pd and 0.01 mg Mg (NO.sub.3).sub.2. The protein concentration of SOD samples, prior to the quantitative analysis of Mn was assessed using the Protein Assay Bio-Rad (Lowry).

(42) Results

(43) Assessment of the amount of manganese contained in rMnSOD long form is reported in Table II.

(44) TABLE-US-00005 TABLE II quantitive examination of manganese present in the molecule sp-24-MnSOD Manganese present in sp24-MnSOD-Synthetic 0.01 atoms/monomer Manganese present in the MnSOD w.type (SIGMA) 0.6-0.7 atoms/monomer

(45) The atomic absorption analysis of rMnSOD long form has shown that in each monomer there is a number of manganese atoms equal to 0.014. These data suggest that the manganese is not the primary metal in rMnSOD. The examination of the MnSOD wild-type has shown, however, the presence of 0.6-0.7 manganese atoms for each monomer.

(46) A similar result was observed with sp6-MnSOD (rMnSOD short form).

EXAMPLE 4: PROTECTIVE AND RESTORATIVE ACTIVITIES OF SYNTHETIC SP24-MNSOD (RMNSOD LONG FORM) ON THE HUMAN RETINA

(47) Materials and Methods

(48) Oct-microperimetric exam with the instrument (Spectral OCT/SLO Otinophthalmic of America Technologies Inc. Canada) (Spaide R F et al., 2008, Fenolland J R et al. 2011).

(49) Preparation of Eye Drops (Eye Lotion)

(50) The eye drop solution was prepared by dissolving 100 g of sp24-MnSOD in 100 ml of 0.9% saline solution. 10 mg of benzalkonium chloride were then added to the solution. The pH of the solution was adjusted to 7.00.

(51) Two drops of eye preparation were administered, twice a day, to three patients with Myopic Retinopaty for twelve months.

(52) Results

(53) From the oct microperimetrical assay, a spot was observed in the retina. The spot assesses quantitatively the sensitivity of the retina to detect and transmit light stimulus, for each area, ranging from zero (red) to sixteen (green). The latter is an indication of an optimal retinal function. The initial examination carried out on the patient, as indicated above, showed a single green area, while most of the areas were red (FIG. 1). After the use of eye drop preparation containing sp24-MnSOD, administered to the patient for twelve months, every day, the examination of the retinal area showed the presence of five green areas (FIG. 2). This result suggests that the retinal cells of the affected area have doubled and are able to detect and transmit light signal. This results demonstrate that the reparative effectiveness of the rMnSOD long form based eye drops, and the reliability of the assay.

(54) The same effect was observed with sp6-MnSOD (rMnSOD short form).

EXAMPLE 5: INHIBITION OF CATARACTOGENESIS BY THE USE OF EYE-DROPS CONTAINING THE SYNTHETIC P24-MNSOD-AFTER EXPOSURE TO UV RAYS

(55) Oxidative stress caused by exposure to ultraviolet radiation of the eye structures exerts a key role in cataractogenesis. In the present invention, the inventor wanted to assess whether the sp24-MnSOD-synthetic could provide protection to the crystalline lens of rabbit eyes exposed to high doses of ultraviolet radiations (UV) emitted by a quartz lamp jeloprotectdouble irradiation 220 v-w 30-2540 amperes (McCourt E A, et al. 2010, Fujiwara T, et al. 2009).

(56) Material and Methods

(57) Normal NZW rabbits (Charles River code 052) were exposed to ultraviolet radiation in the presence or absence of a collyrium of 10 ml, containing 100 g of sp24-MnSOD-synthetic dissolved in 0.9% NaCl+10 mg of benzalkonium chloride, administering 2 drops/eye/day for 15 days. At the end of the experiments, the rabbits were sacrificed and the eyes analyzed histologically to study structural modifications. Similarly, and as negative control, an eye drop containing the comparative wild type MnSOD was used at the same concentration and the same composition.

(58) Results

(59) The treatment of the eyes exposed to UV with the drops containing the synthetic sp24-MnSOD- has shown that the protein exerts a significant protective role on the crystalline lens of rabbits. Protection is evidenced by the maintenance of the integrity of the crystalline lens which showed a normal transparency (FIG. 3A). This result suggests that the synthetic-sp24-MnSOD reduces oxidative stress caused by UV radiations (lamp 220-v-w-2540 30 Ampere), preventing them from damaging the ocular structures and in particular the crystalline. The treatment of rabbit eyes with a similar eye drops containing the comparative MnSOD w.type gave completely negative results shows that, in this case, the lenses were completely destroyed (FIG. 3B). In conclusion, the administration of eye drops containing the synthetic sp24-MnSOD, in rabbit eyes exposed to ultraviolet radiation, provides significant protection against the process of cataractogenesis.

(60) The same effect was observed with sp6-MnSOD (rMnSOD short form).

(61) Therefore, the proteins of the invention may be used for the prevention and/or treatment of cataracts.

EXAMPLE 6: EFFECT OF THE PROTEINS OF THE INVENTION ON LEUKEMIA CELLS

(62) Materials and Methods

(63) Culture Cells

(64) Lymphoblastic leukemia cells were collected from one patient diagnosed and treated for T-cell acute lymphoblastic leukemia (T-ALL) at the Pediatric Oncology Unit of Second University of Naples and purified by bone marrow using Ficoll Hystopaque density gradient centrifugation. Clinical characteristics of patient at diagnosis were: age 3 years old, white blood count 197000/L, FAB classification L2, good prednisone responder and early T immunophenotype.

(65) Leukemic lymphoblasts, Jurkat cells and lymphocytes from healthy donors (as control) were cultured at a density of 110.sup.6 cells/mL in RPMI media supplemented with 1% Penstrep and 10% FBS in a humidified atmosphere containing 5% CO.sub.2 at 37 C.

(66) Cell Viability Assay

(67) Cell viability was analyzed by MTT [3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyl tetrazolium bromide] assay. Cells were seeded in 96-well plates at the density of 110.sup.3 cells/well in a final volume of 100 L. Cells were then incubated at 37 C. in a humidified atmosphere to allow exponential growth. After 72 hours of growth, cells were treated with rMnSOD long form at a final concentration ranging from 0.0067 M to 0.67 M, for 5 hours. At 5 hours from the treatment, cells were exposed to 10% MTT for 3 hours at 37 C. to form formazan crystals by reacting with metabolically active cells. The formazan crystals were solubilized in a 1N isopropanol/HCL 10% solution at 37 C. for 30 minutes. The absorbance at 595 nm was then determined. Cell viability was determined by the formula: Cell viability (%)(absorbance of the treated wellsabsorbance of the blank control wells)/(absorbance of the negative control wellsabsorbance of the blank control wells)100%. Control cells (leukemic lymphoblasts, Jurkat cells and lymphocytes) were cultured under identical conditions but in the absence of rMnSOD long or short form. All experiments were performed in triplicate.

(68) Cell Cycle Analysis

(69) Jurkat cells were seeded at density of 110.sup.6 and then incubated 24 hours in humidified atmosphere at 37 C. The next day, the cells were treated with 0.067 M rMnSOD long form for 5 hours in humidified atmosphere at 37 C. After incubation, cells were washed in PBS 1, pelleted, and stained with Propidium Iodide (PI) solution (50 mg PI in 0.1% Sodium citrate, 0.1% NP40, pH 7.4) for 30 minutes at 4 C. in the dark. Flow cytometry analysis was performed using a FACScan flow cytometer (Becton Dickinson, San Jose, Calif.). To evaluate cell cycle, PI fluorescence was collected as FL2 (linear scale) by the ModFIT software (Becton Dickinson). The intracellular DNA content evaluation, was performed by analyzing 20000 events for each point in triplicate. Each experiment gave a S.D. less than 5%.

(70) Evaluation of Apoptosis by DNA-Flow Cytometry

(71) Apoptotic cell death was analyzed by Annexin-V-FITC staining Annexin-V-FITC binds to phosphatidylserine residues, which are translocated from the inner to the outer leaflet of the plasma membrane during the early stages of apoptosis. Apoptotic cell labeling was performed using an Annexin-V kit (MedSystems Diagnostics, Wien, Austria). Jurkat cells were seeded at the density 110.sup.6 and then incubated 24 hours in humidified atmosphere at 37 C. Then the cells were treated with 0.067 M rMnSOD long form and incubated at 37 C. for 5 hours. After the incubation the cells were collected and centrifuged for 5 minutes at 1,500 rpm. Pellet was washed in PBS 1, incubated with Annexin-V-FITC in a binding buffer (10 mM HEPES, pH 7.4, 150 mM NaCl, 5 mM KCl, 1 mM MgCl2, 2.5 mM CaCl2) for 30 minutes at 4 C. Analysis of apoptotic cells was performed by flow cytometry (FACScan, Becton Dickinson). 1010.sup.4 events were acquired for each sample. Analysis were carried out in triplicate.

(72) Immunocytochemistry at Light Microscopy

(73) Lymphoblastic leukemia cells, Jurkat cells, and lymphocytes were incubated for five hours in the presence or absence of rMnSOD long form at a final concentrations ranging from 0.0067 to 0.67 M. Subsequently, a cytospin was used to smear cells onto slides. The smears were fixed in Zamboni solution (4% paraformaldehyde, 15% picric acid) for 60 minutes and then washed with 1PBS and incubated for five minutes with 3% hydrogen peroxide to quench endogenous peroxidase activity. Immunostaining was performed using the DAKO LSA+System HRP kit. Rabbit anti-rMnSOD-Lp (1:200), was incubated on slides for 30 minutes, followed by incubation with the biotinylated secondary antibody for 30 minutes and peroxidase-labeled streptavidin for 30 minutes. To complete the reaction, a substrate-chromogen solution was used. The smears were counterstained with hematoxylin.

(74) Determination of the Apoptotic Index

(75) Apoptotic cells and bodies were counted from several areas of each sample. The apoptotic index (AI) was estimated as the number of apoptotic cells and/or bodies per 1000 tumor cells, expressed in percentages.

(76) Immunogold Method at Transmission Electron Microscopy

(77) Both leukemic cells and lymphocytes were incubated for six hours in the presence or absence of rMnSOD long form at a final concentration ranging from 0.0067 to 0.67 M. The cells were then fixed using 0.1% glutaraldehyde and 4% paraformaldehyde in 0.1 M sodium cacodylate buffer for 60 minutes at room temperature and washed twice in 0.1 M sodium cacodylate buffer. Samples were then treated with 1% OsO4 for 10 minutes, dehydrated, embedded in Epon 812, and polymerized at 60 C. for 24 hours. Ultrathin sections were prepared using a Leica Ultracut UCT ultramicrotome and mounted on nickel grids. The sections were subsequently subjected to antigen unmasking in citrate buffer, incubated with 10% hydrogen peroxide for 10 minutes, washed 3 times in PBS 0.9% for 5 minutes, and incubated in BSA 1% and glycine 0.15% in PBS for 30 minutes. The samples were incubated with polyclonal rabbit anti-rMnSOD-Lp (1:20) in Tris-HCl 0.05 mol/L with 1% BSA overnight at 4 C., washed three times in PBS 0.9% for 10 minutes, and incubated with a donkey anti-rabbit secondary antibody conjugated to 15 nm colloidal gold diluted (1:10) in 0.1% BSA for 2 hours at room temperature. The sections were washed in PBS (pH 7.4) and distilled water prior to counterstaining with uranyl acetate and lead citrate. Ultrathin sections were examined using a LEO 912AB Zeiss transmission electron microscope.

(78) Protein Extraction and Western Blot Analysis.

(79) Protein extraction was performed on ice for 30 minutes using lysis-buffer (1M Tris-HCl pH 8, 5M NaCl, 0.5 M NaF, 100% NP40) with protease-inhibitors (4 L/mL PMSF, 2 L/mL aprotinin and pepstatin, 1 L/mL Na Ortovanadate). Cell lysates were centrifuged at 20,000 g for 2 minutes at 4 C., and proteins were extracted from supernatant. Total protein concentration was determined using Bradford assay (Bio-Rad). For Western blot analysis, 30 g of total protein was run on 10% polyacrylammide gel and blotted onto PVDF membrane (Millipore, Marlborough, Mass.). The membrane was blocked in 5% nonfat dry milk dissolved in TBS buffer (2 mM Tris, 13.7 mM NaCl, 0.1% tween-20, pH 7.6) overnight. All washes were performed in TBS buffer. Immunoblotting was performed using primary antibodies against Bcl-2 (100), Bax (N20), AKT (H-136), pAKT (Ser473), ERK (G-12), and pERK (E-4) (Santacruz Biotechnology, INC) (1:500) incubated for 1 hour. Secondary antibodies (Santacruz Biotechnology 1:5000) were incubated at room temperature for 1 hour. Bands were visualized using a chemiluminescent system (ECL-Amersham). The intensity of each band was acquired with a CCD camera and analyzed with Quantity One 1-D analysis software (Biorad Laboratories). Results were normalized against the level of -actin expression in each sample.

(80) Detection of Reactive Oxygen Species

(81) Cell samples were pretreated with or without 10 mM NAC (Sigma-Aldrich, Saint Louis, USA) at 37 C. for 20 minutes, and incubated with 0.067 M rMnSOD long form for 5 hours, then the cells were washed with PBS 1 and incubated with 10 M 2,7-dichlorodihydrofluorescein diacetate (DCFH-DA-Cayman, Baverno, Italy) at 37 C. for 20 minutes. DCFH-DA diffused into cells is deacetylated by cellular esterases to non-fluorescent 2,7-Dichlorodihydrofluorescin (DCFH), which is rapidly oxidized to highly fluorescent 2,7-Dichlorodihydrofluorescein (DCF) by ROS. The fluorescence intensity is proportional to ROS levels within the cell cytosol; the fluorescence intensity was assessed using a Hitachi (Model U-2000) double-beam spectrofluorimeter with excitation at 484 nm and emission at 530 nm. Background fluorescence (conversion of DCFH-DA in absence of homogenate) was corrected by the inclusion of parallel blanks.

(82) Results

(83) Effects of rMnSOD Long Form on Growth Inhibition on Human T-ALL Cells, Jurkat Cells and Lymphocytes.

(84) Cells were cultured and monitored for 3 days to assess cellular concentration and proliferation using Trypan blue exclusion assay and MTT tests (Table III).

(85) TABLE-US-00006 TABLE III 3 day-culture cell viability Cell Concentration Trypan Blue Morphology A T-leukemic cells T0 1000000/mL 78% NM. ND. Clump absent T1 400000/mL 87% NM. ND. Clump absent T2 400000/mL 65% NM. ID. Clump present B Jurkat cells 800000/mL 100% NM. ID. Clump present C Normal Lymphocytes T0 1200000/mL 100% NM. ND. Clump absent T1 800000/mL 90% NM. ID. Clump absent T2 800000/mL 70% NM. ID. Clump present NM: normal morphology; ND: normal density; ID: increased density

(86) To perform the experiments with the optimal dose of rMnSOD long form, the inventor initially determined the dose-dependent survival rate of Jurkat and T-ALL upon rMnSOD long form treatment. The inventor observed, based on Trypan blue exclusion assay and MTT tests, a less than 5% cell death after 5 hours treatment with 0.003 M rMnSOD long form, whereas a significant reduction in cell viability (by 30%, data not shown) was induced by a 5 hours treatment with 0.067 M rMnSOD long form. Thus, 0.067 M rMnSOD long form was selected for the subsequent experiments to minimize the apoptosis-induced alteration in protein expression.

(87) In details, after 72 hours of growth, cells were treated with 0.067 M rMnSOD long form for 5 hours in culture. The inventor observed, with MTT test, a proliferation rate of 1% T-ALL cells, 40% Jurkat and 70% lymphocytes (FIG. 4A). Moreover with Trypan blue exclusion assay, performed in the same conditions, the inventor observed a growth inhibition of 99% T-ALL cells, 60% Jurkat and 30% lymphocytes (FIG. 4B). Spontaneous proliferation curves of Jurkat cells line, T-ALL and lymphocytes were used as normalized controls. These curves showed an increase of Jurkat cell's growth, a decrease of lymphocyte growth after 48 h and a slight decrease followed by a stabilization of T-cell ALL's growth after 48 h to 96 h (FIG. 4C).

(88) The same effect was observed with rMnSOD short form.

(89) Effect of rMnSOD Long Form on Apoptosis Induction

(90) After the treatment with 0.067 M rMnSOD, the inventor evaluated the induction of apoptosis on Jurkat cells by FACS analysis, after staining with Annexin-V-FITC and PI, as above described. As shown in FIG. 5 and Table IV, a significant increase of apoptotic cells compared to control cells has been detected. In details, the inventor found that the treatments with 0.067 M rMnSOD long form for 5 hours induced apoptosis in 23.7% of Jurkat cells, compared to 5% untreated cells.

(91) TABLE-US-00007 TABLE IV Cell Cycle analysis UR LL LR UL Late Living Early Necrosis Apoptosis Cells Apoptosis CTR 3.8 5 90.8 0.4 rMnSOD 2.5 23.7 67.1 6.6 0.067 M Insets, % of positive cells. UL = Upper Left (necrosis); UR = Upper Right (late apoptosis); LL = Lower Left (viable); LR = Lower Right (early apoptosis). Untreated cells, CTR.

(92) FIG. 5 (B) shows cell cycle FACS analysis after Propidium Iodide (PI) incorporation in Jurkat cells. The inventor observed that 0.067 M rMnSOD long form did not induce significant changes in cell cycle distribution if compared to untreated cells.

(93) The same effect was observed with rMnSOD short form.

(94) Light Microscopy

(95) The treatments performed respectively with 0.0067, 0.067 and 0.67 M rMnSOD long form for 5 hours on the three cell populations gave the following percentages of labeled cells: 40%, 60% and 76% of cultured leukemic T cells; 60%, 73% and 100% of Jurkat cells and 60%, 70% and 75% of lymphocytes, while the controls displayed no labeling (FIG. 6A). Overall, these results indicate that most cells internalized rMnSOD, as they displayed both mainly cytoplasmic and less nuclear immunoreactivity (FIG. 7A-F; H-J). The percentages of viability as a result of the three concentrations of rMnSOD long form tested are reported in FIG. 6B.

(96) The same effect was observed with rMnSOD short form.

(97) Leukemic T-Cell and Jurkat Cells

(98) The T leukemic cells and Jurkat cells, treated with 0.67 M rMnSOD long form, displayed cytoplasmic and nuclear positivity as well as rupture of the plasma membrane, (FIGS. 7F; 9E-F). In contrast, both the cells treated with 0.0067 and 0.067 M rMnSOD long form showed cytoplasmic positivity as well as the pre-apoptotic changes of early and complete nuclear and cytoplasmic fragmentation (FIGS. 7A-E; 9A-D).

(99) The same effect was observed with rMnSOD short form.

(100) Lymphocytes

(101) Lymphocytes treated with 0.67 M rMnSOD long form showed cytoplasmic and slight nuclear positivity as well as rupture of the plasma membrane. (FIGS. 7J; 9K-L); whereas cells treated with 0.0067 or 0.067 M rMnSOD long form showed no morphological alterations (FIGS. 7H-J; 9I-L). Lymphocytes (not treated with rMnSOD) displayed no positivity (FIGS. 7G; 9G-H). Together, these findings indicate that 0.0067 and 0.067 M rMnSOD long form cause apoptosis of only leukemic cells, instead 0.67 M rMnSOD long form is a toxic concentration.

(102) The same effect was observed with rMnSOD short form.

(103) Determination of the Apoptotic Index

(104) The number of the cells displaying both apoptotic nuclear and cytoplasmic fragmentation, is reported in FIG. 8. Apoptotic cells and bodies were counted from several areas of each sample. The apoptotic index (AI) was estimated as the number of apoptotic cells and/or bodies per 1000 tumor cells, expressed in percentages. rMnSOD long form treatment induces apoptosis in both cultured ALL patient cells and in Jurkat cell line, without adverse effects on lymphocytes. In fact it is shown that 0.067 M rMnSOD long form causes apoptosis of leukemic T cells and of Jurkat cells in vitro and it is observed (by MTT assay) a survival rate of 1% T-ALL cells, 40% Jurkat and 70% lymphocytes after treatment with rMnSOD long form.

(105) The same effect was observed with rMnSOD short form.

(106) Transmission Electron Microscopy

(107) The inventor used transmission electron microscopy (TEM) to confirm the internalization of rMnSOD long form by leukemic T cells, Jurkat cells, and lymphocytes treated with 0.0067, 0.067 and 0.67 M of rMnSOD. The TEM results show colloidal gold particles (10 nm) dispersed mainly in the cytoplasm and sometimes near the mitochondrial envelope (FIGS. 9A-F; I-L), confirming that rMnSOD long form enters the cells. The internalization of rMnSOD long form was also evident in nuclear and cytoplasmic apoptotic fragments (FIGS. 9C-D) and in damaged cells (FIGS. 9E-F). rMnSOD long form also enters lymphocytes, as indicated by the presence of the 10 nm-gold particles distributed in the cytoplasm (FIGS. 9I-L) after the 5 hour treatment. No labeling was observed in untreated cells (FIGS. 9G-H).

(108) The same effect was observed with rMnSOD short form.

(109) rMnSOD Long Form Treatment on Survival Pathway

(110) To determine the mechanism of growth inhibition by rMnSOD long form in more details, the inventor analyzed the apoptotic profile after treatment with rMnSOD. In particular the inventor evaluate expression of Bcl-2 and Bax in leukemic T cells, Jurkat cells, and lymphocytes at a final concentration ranging from 0.0067 to 0.67 M of rMnSOD.

(111) The treatment of leukemic T cells with 0.067 M rMnSOD long form induces the expression of pro-apoptotic Bax and suppresses expression of Bcl-2 in comparison to non-treated cells (FIG. 10A-D). Jurkat cells treated with 0.067 M rMnSOD long form also showed increased expression of Bax and decreased expression of Bcl-2 (FIG. 10B-E). Conversely, the treatment of lymphocytes with 0.067 M rMnSOD long form did not affect Bcl-2 or Bax expression in comparison to non-treated counterparts (FIG. 10C-F).

(112) The same effect was observed with rMnSOD short form.

(113) rMnSOD Long Form Treatment on Proliferation Pathway

(114) To analyze if rMnSOD long form acts also on key regulators of proliferation pathways, the inventor assess AKT and ERK phosphorylation respect to basal levels. The inventor founded that rMnSOD long form treatment did not affect AKT phosphorylation in all tested samples. No changes in the expression of phosphorylated ERK, following rMnSOD long form treatment, resulted in T-ALL cells and in lymphocytes (FIG. 10A, C), while a slightly decreased expression of phosphorylated ERK was detected in Jurkat cells (FIG. 10B), thus indicating that growth inhibition after rMnSOD long form treatment could be not influenced by MAP/ERK chinase pathway but by apoptotic pathway, except for Jurkat cells that are a model with altered multiple pathways.

(115) The same effect was observed with rMnSOD short form.

(116) Detection of Reactive Oxygen Species

(117) N-acetylcysteine (NAC) resulted in blocking of rMnSOD-induced ROS generation, as shown in FIG. 11. In fact 10 mM NAC induced a DCF decrease, following incubation with 0.067 M rMnSOD, while the treatment without NAC, showed fluorescence comparable to the control. These data suggest that 0.067 M rMnSOD long form induces ROS production in much higher amounts than in controls, as expected.

(118) The same effect was observed with rMnSOD short form.

(119) It is well known that leukemic cells produce high levels of reactive oxygen species and have a disturbance of the protective role of enzyme against free radical. This variability of cell antioxidant machinery and ROS production, according to the cancer type, may be explained by the level of antioxidant defense which lead to a ROS production effective in generating neoplastic cell transformation but not enough to trigger apoptosis. Increasing evidence demonstrates the key role of ROS in the regulation of cell life and death. The toxic potential of ROS is able to activate the immune response.

(120) Thus, the development of new therapeutic interventions must deal with the duality of ROS in both protective cytotoxic against non self action and injurious action of their exceeding accumulation able to induce carcinogenesis (Manda et al., 2009). Similarly the rMnSOD long form shows a duality of action too, being able to trigger apoptotic death of cancer cells while oxygenates the healthy cells, or, if it exceeds the ability of catalase to transform the peroxide into oxygen and water, can induce necrosis in both tumor cells and healthy cells (Mancini et al., 2006). So the redox balance appears to be the main mechanism of carcinogenesis control (Manda et al., 2009; Barbosa et al., 2012). In this study, the inventor demonstrated that rMnSOD long form treatment induce apoptosis in both cultured ALL patient cells and in Jurkat cell line, without adverse effects on lymphocytes. In fact the inventor showed that 0.067 M rMnSOD long form causes apoptosis of leukemic T cells and of Jurkat cells in vitro and the inventor observed (by MTT assay) a survival rate of 1% T-ALL cells, 40% Jurkat and 70% lymphocytes after treatment with rMnSOD. Moreover, the inventor showed that 0.067 M rMnSOD long form upregulates the pro-apoptotic protein Bax and inhibits the anti-apoptotic protein Bcl-2 in leukemic T cells. This data are in accordance with Mancini et al. (Mancini et al., 2006) on breast cancer cells who confirm a strong upregulation of pro-apoptotic Bax gene expression in the presence of rMnSOD, suggesting that this treatment might induce the apoptotic cascade. The possible involvement of an apoptotic mechanism was suggested by the strong inhibition of anti-apoptotic Bcl-2 gene expression detected in tumor cells in the presence of rMnSOD (Mancini et al., 2008). In addition, FACS analysis of cells treated with 0.067 M rMnSOD long form displayed an evident increase of apoptotic cells in 23.7% of Jurkat cells, as compared to control cells.

(121) Interestingly, leukemic cells internalize the exogenous rMnSOD long form that converts free radicals present in H.sub.2O.sub.2. Notably, catalase detoxifies H.sub.2O.sub.2 into molecular oxygen and it is usually in lower amount in leukemic cells than in healthy cells. (Battisti et al., 2008). Thus, treatment with rMnSOD long form may lead to accumulation of H.sub.2O.sub.2 and subsequent death of leukemic cells. In contrast, lymphocytes do not show this reduction in catalase activity and can tolerate high levels of endogenous H.sub.2O.sub.2 production. However, a concentration of 0.67 M rMnSOD long form is toxic to leukemic cells and to lymphocytes; in fact at this concentration the rMnSOD long form induces necrosis due to a stechiometric imbalance that is created between the enzymes MnSOD and catalase. The same effect was observed with rMnSOD short form.

(122) In conclusion, the present findings suggest that rMnSOD long and short forms could be considered as an associated additional treatment for leukemia, particularly as low concentrations of rMnSOD long or short form seem specifically toxic to cancer cells while having a protective effect on healthy cells. According to the current knowledge about the therapeutic target role of the redox balance (Barbosa et al., 2012; Manda et al., 2009), these results suggest an action for the rMnSOD long and short forms which would achieve a good therapeutic efficiency and no side effects.

EXAMPLE 7: EFFECT OF RMNSOD LONG FORM ON NEUROBLASTOMA

(123) The effect of the novel isoforms of recombinant human manganese superoxide dismutase (rMnSOD) with long and short leader peptide were investigated in an in vitro model of cell culture (neuroblastome SK-N-BE cells cell cultures). Several lines of evidence suggested indicated that the new molecule acts as an anticancer agent.

(124) To evaluate this hypothesis, the inventor treated our neuron-like cell cultures with two different rMnSOD long form with long and short leader sequence.

(125) Cells growing in their specific medium were incubated in the presence of rMnSOD (long and short rMnSOD) added to the culture medium. To determine the cytotoxicity of both proteins, cells were examined to light microscope for induction of cytopathic changes as exemplified in the FIG. 12 (a-b-c) with the long form.

(126) Both the recombinant proteins were rapidly internalized by neuron-like cells and show tumorigenic activity on cells, with sign of toxicity after 5-6 h in culture.

(127) Methods

(128) 20000 neuroblastome SK-N-BE cells were seeded in 24-multiwell (FALCON) with MEM medium supplemented by 10% FCS (GIBCO). 24 hr later the long and the short rMnSOD (1.25 M) was added in each well. After 24 and 48 hr the cells were washed twice with PBS. Then the cytotoxic activity of both proteins rMnSOD were evaluated by using the LDH tests accordingly to method described in (Int. J. of Cancer123, 2684-2695, 2008).

(129) Results

(130) The results show that the cytotoxic effect of rMnSOD long form on neuroblastome SK-N-BE cells generate its killing effect (FIG. 12a-c).

(131) The same effect was observed with the rMnSOD short form.

(132) In conclusion, these data suggest that the two recombinant iso forms (with the short and long leader sequence) MnSOD are cytotoxic for neuroblastoma cells SK-N-BE, suggesting their use in the treatment of neuroblastoma.

EXAMPLE 8: EFFECT OF RMNSOD LONG FORM ON BRAIN INFLAMMATION

(133) The effect of rMnSOD long form was investigated by an in vivo animal model of middle-aged mice. Several lines of evidence suggested that rMnSOD long form is able to strongly blunt oxidative stress and tissue inflammation. These biological processes appear to bear critical components involved in physiological aging and pathological neuro-degeneration, thus suggesting that the activity of the rMnSOD long form could partially modulate both these processes and potentially reduce some of their adverse aspects effects.

(134) To evaluate this hypothesis the inventor treated middle-aged mice Balb-C (18 months of age) with rMnSOD long form by chronic intra-nasal administration. (2 g of protein in 50 l/day)

(135) The present findings show that although no behavioural differences were observed in learning and memory tasks, the biochemical analysis of the cerebral cortices of treated mice in comparison to controls showed a significant decreasing pattern of the expression of 5 proteins involved into inflammatory pathways (BLC, CD30L, Fas Ligand, Kc, TNFR2), paralleled by a lower protein expression trend observed for IL-1Beta and I-Tac. (FIG. 14)

(136) The same effect was observed with rMnSOD short form.

(137) Material and Methods

(138) Simultaneous Detection of Cytokine Levels in Mice Cortical Tissues.

(139) Simultaneous detection of multiple mouse cytokines was performed with Mouse Cytokine Antibody Array-Membrane (Abcam, Cambridge, UK) according to manufacturer's instructions. On the membrane were spotted antibodies against 97 mouse cytokines, positive (biotin-conjugated IgG protein) and negative (buffer used to dilute antibodies printed on the array) controls. Briefly the cortical tissues of mice treated with rMnSOD long form and saline solution were lysed with lysis buffer containing protease inhibitors, homogenized and clarified by centrifugation. The membrane was incubated with blocking buffer for 30 min at room temperature (RT), then with 500 g of total proteins in blocking buffer overnight at 4 C. After 3 washing with wash buffer I and 3 washing with wash buffer II, the membrane was incubated with biotin conjugated anti-cytokines overnight at 4 C. After 3 washing with wash buffer I and 3 washing with wash buffer II, the membrane was incubated with HRP-conjugated streptavidin overnight at 4 C. The chemiluminescent signals were revealed with detection buffer. The membrane was transferred to imaging system and exposed for 2 min. The raw densitometry data were subtracted from the background (negative control probes) and normalized to the positive probe signals for comparison of results across multiple arrays.

(140) In conclusion, these data suggest that the recombinant iso forms of manganese superoxide dismutase of the invention as long or short forms are able to enter inside neuronal cells and modify brain protein expression. This suggests their effects on central nervous system and particularly in neurodegenerative diseases as possible pharmacological tool to develop innovative therapies.

EXAMPLE 9: COMPARISON BETWEEN THE RMNSOD LONG AND SHORT FORMS OF THE INVENTION AND DIFFERENT RECOMBINANT MNSOD

(141) The cytotoxic effect on tumor cells of the present proteins (Long and Short rMnSOD) were examined in comparison with two others human recombinant SOD2:

(142) the first, SEQ ID No. 7 (called SIGMA), is a human recombinant SOD2, a full-length GST-tagged protein, with the leader peptide of 24 aminoacids and without 5 aminoacids at C-terminal;

(143) the second, SEQ ID No. 8 (called Abcam), is a human recombinant SOD2, a full-length protein, without the leader peptide of 24 aminoacids, without tag and without 5 aminoacids at C-terminal.

(144) TABLE-US-00008 SequenceofcomparativerMnSOD(namedSIGMA,SEQ IDNO.7): MSPILGYWKIKGLDQPTRLLLEYLEEKYEEHLYERDEGDK WRNKKFELGLEFPNLPYYIDGDVKLTQSMAIIRYIADKHN MLGGCPKERAEISMLEGAVLDIRYGVSRIAYSKDFETLKV DFLSKLPEMLKMFEDRLCHKTYLNGDHVTHPDFMLYDALD VVLYMDPMCLDAFPKLVCFKKRIEAIPQIDKYLKSSKYIA WPLQGWQATFGGGDHPPKSDLVPRGSMLSRAVCGTSRQLA TVLGYLGSRQKHSLPDLPYDYGALEPHINAQIMQLHHSKH HAAIVNNLNVTEEKYQEALAKGDVTAQIALQPALKFNGGG HINHPIFWTNLSPNGGGEPKGELLEAIKRDFGSFDKFKEK LTAASVGVQGPGWGWLGFNKERGHLQIAACPNQDPLQGTT GLIPLLGIDVWEHAYYLQYKNVRPDYLKAIWNVINWENVT ERYMACKK SequenceofcomparativerMnSOD(namedAbcam,SEQ IDNo.8): KHSLPDLPYDYGALEPHINAQIMQLHHSKHHAAYVNNLNV TEEKYQEALAKGDVTAQIALQPALKFNGGGHINHSIFWTN LSPNGGGEPKGELLEAIKRDFGSFDKFKEKLTAASVGVQG SGWGWLGFNKERGHLQIAACPNQDPLQGTTGLIPLLGIDV WEHAYYLQYKNVRPDYLKAIWNVINWENVTERYMACKK

(145) The cytotoxic effect of two comparative recombinant proteins has been assessed through LDH assay (Table V), at the concentration of 1.5 M, and compared to the effect achieved by the rMnSOD proteins of the present invention (rMnSOD Long Mancini and rMnSOD Short Mancini).

(146) TABLE-US-00009 TABLE V Citotoxic effect of different rMnSOD on various cell lines MCF- MCF-7 MiaPaCa OVCAR3 A375 10 rMnSOD Long Mancini 1.5 M 97% 86% 94% 68% 13.50% rMnSOD Short Mancini 1.5 M 98.10% 85.80% 95% 71% 12% rMnSOD abcam 1.5 M 12.20% 2.30% 9.90% 14% 11% rMnSOD SIGMA 1.5 M 7.30% 4.15% 8% 15.30% 11.70% cisPt 25 M 38.80% 36.90% 20.30% 35% 51% cisPt 1.5 M 15.30% 5.80% 2.20% 12% 17.70% CRTL (glicerol buf. Acqueous) 2.20% 2.20% 2.20% 2% 2% CRTL (HEPES 20 mM) 6.60% 6.60% 6.60% 6.60% 6.60%

(147) The results are also illustrated on FIG. 15. Cell lysis induced upon four different rMnSOD treatments was measured through release of LDH enzyme. rMnSODs were added to exponentially growing cultures to a final concentration of 1.5 M (unless differently indicated), and the release of LDH into the medium supernatant was measured at indicated times post application, using the CytoTox 96 nonradioactive cytotoxicity assay kit from Promega, according to the manufacturer's recommendations. Experiments were performed in triplicate, using different rMnSOD preparations (rMnSOD long Mancini, rMnSOD long Mancini rMnSOD SIGMA and rMnSOD Abcam) and the LDH release was expressed as the fraction of total LDH released upon detergent treatment.

(148) LDH release into the culture supernatant, expressed as a percentage of the total LDH (from cell lysis induced by detergent treatment). Approximately 3% LDH was found in the medium of untreated cultures. rMnSODs were tested for their cytostatic and cytolytic effects on other human mammary epithelial cell lines of normal (MCF-10) or tumor (MCF-7) origin and on a variety of non-mammary transformed cells (OVCAR-3, Mia PaCa, A-375). rMnSOD (long and short) Mancini induced MCF-7 cell culture to release 97%-98.10% of their LDH content into medium (as compared to the artificial LDH-release induced by detergent treatment), whereas very lower increase in LDH activity could be detected in MCF-10 cell culture supernatants upon application of this recombinant protein versus 12.20% of rMnSOD Abcam and 7.30% of rMnSOD Sigma. The tumor-derived MIA PaCa-2, OVCAR-3, A375 cells all showed a striking sensitivity to rMnSODs Mancini-induced killing.

(149) Then the rMnSOD long and short form of the present invention display improved properties compared to other forms of rMnSOD.

EXAMPLE 10: EFFECT OF THE RECOMBINANT MNSOD OF THE PRESENT INVENTION ON LIVER CIRRHOSIS AND ORGANS FOR GRAFT

(150) High oxidative stress plays a major role in increasing hepatic vascular resistance in cirrhosis, by facilitating liver fibrosis and by increasing hepatic vascular tone. Inventor's study aimed at investigating whether the use of rMnSOD could be a new therapeutic strategy to reduce oxidative stress and portal hypertension in cirrhotic rats. In CCl.sub.4 and BDL-cirrhotic rats treated with rMnSOD long form (i.p. 15 g/Kg/day) or its vehicle for 7 days, mean arterial pressure (MAP), portal pressure (PP) and portal blood flow (PBF) or small mesenteric arterial flow (SMABF) were measures. In addition, in CCl.sub.4-cirrhotic rats, we evaluated the hepatic vasodilatatory response to acetylcholine, liver fibrosis with Sirius red staining and hepatic stellate cell activation by -smooth muscle actin (-SMA) protein expression. rMnSOD long form treatment significantly reduced PP either in CCl.sub.4.sup. or BDL-cirrhotic rats without significant changes in splanchnic blood flow, suggesting a reduction in hepatic vascular resistance. MAP was not modified. Reduction in PP was associated with a significant reduction in liver fibrosis, and -SMA protein expression as well as with improved vasodilatatory response to acetylcholine.

(151) Chronic rMnSOD long form administration to cirrhotic rats reduces portal pressure by reducing hepathic vascular resistance without deleterious effects on systemic hemodynamic, suggesting that it might constitute a new antioxidant to be considered as additional therapy for treating portal hypertension in cirrhosis.

(152) Hepatic microcirculatory dysfunction due to cold storage and warm reperfusion (CS+WR) injury during liver transplantation is partly mediated by oxidative stress and may lead to early graft dysfunction. This is especially relevant when steatotic donors are considered. The inventor aimed at characterizing the effects of rMnSOD on the microcirculation, parenchymal injury and endothelial function of livers undergoing CS+WR.

(153) Oxidative stress and nitric oxide were determined in primary cultured liver endothelial cells cold stored with rMnSOD long form or its vehicle and then warm reperfused. Control and steatotic rats received a single dose of rMnSOD long form or its vehicle 30 min before liver procurement and grafts were cold stored for 0 h (control group) or 16 h. After 1 h of warm reperfusion, hepatic microcirculation, endothelial function and phenotype, and liver injury were analyzed. The antioxidant effects of adding rMnSOD long form to a cold storage solution were also assessed in rat and human livers undergoing CS+WR.

(154) After CS+WR, the liver endothelium exhibited elevated superoxide and diminished nitric oxide levels; these detrimental effects were prevented by rMnSOD. CS+WR control and steatotic rat livers exhibited markedly deteriorated microcirculation and acute endothelial dysfunction development, together with liver damage, inflammation, oxidative stress, and low nitric oxide. rMnSOD long form markedly blunted oxidative stress, which was associated with global improvement in liver damage and microcirculatory derangements. rMnSOD long form addition to cold storage solution maintained its antioxidant capability protecting both rat and human liver tissues.

(155) The same effects were observed with rMnSOD short form.

(156) rMnSOD longand short form represent a new and highly effective therapy to significantly upgrade liver procurement for transplantation.

EXAMPLE 11: EFFECT OF THE RECOMBINANT MNSOD OF THE PRESENT INVENTION ON ROS, IN PARTICULAR IN A MODEL OF DILATED CARDIOMYOPATHY (CMD)

(157) Material and Methods

(158) ROS Measurement Assay

(159) To measure the level of ROS in the kidney, the inventor performed a 27 dichloroflurescin diacetate assay as described in (Borrelli, et al., 2011). At the end of the in vivo treatment, rats were anaesthetized and then sacrificed by exsanguinations and the right kidney was quickly stored at 80 C. Later, the kidneys were thawed on ice and weighed. Kidneys were homogenized in 5 mL of Tris-Hcl 40 mM (pH 7.4) with Ultraturrax. Protein concentration was assessed by the Bio-Rad protein assay. 27 dichloroflurescin diacetate 5 M (Molecular Probes) was utilized for the assay from a 500 M stock. The tissue samples were diluted in a range from 10 000 to 2500 times. The spectrum was analysed from 480 to 525 nm at different times (T0, T10, T30) using a spectrophotometer Jasco FP-777. The levels of ROS were expressed as intensity fluorescence (IF) normalized for grams of tissue and micrograms of proteins.

(160) Results

(161) TABLE-US-00010 TABLE VI ROS quantification in different groups under study Sample serum IF/mg protein nM DCF/mg protein A1 control 13700 590 A2 control + rMnSOD long form 6263 270 B1 CMD 6312 270 B2 CMD + rMnSOD long form 2854 120 C1 CMD 9928 430 C2 CMD + rMnSOD long form 7001 300 A1: human normal serum; A2: human normal serum treated in the presence of rMnSOD long form; B1: human serum of a patient affected by CDM in the absence of rMnSOD long form; B2: human serum of a patient affected by CDM in the presence of rMnSOD long form; DCF: 27 dichloroflurescin diacetate; CDM: Dilated Cardio myopathy; IF: intensity fluorescence

(162) Results from these experiments demonstrated that after only 5 mm incubation with 2 g of rMnSOD long form and 1 ml of serum derived from patient bearing CMD, the amount of ROS has been strongly reduced, suggesting that a continuously infusion i.v. of rMnSOD long form could reduce the CMD in the patients

(163) The same effects were observed with rMnSOD short form.

(164) Then rMnSOD long and short forms are useful for the treatment of CMD.

EXAMPLE 12: PROTECTIVE EFFECT OF THE RECOMBINANT MNSOD OF THE PRESENT INVENTION IN MICE EXPOSED TO THE PROTON RADIATIONS

(165) Material and Methods

(166) Using the model of sublethal whole-body irradiation with protons available at Phasotron of the Joint Institute for Nuclear Research (Dubna), we reconstructed the bone-marrow form of the acute radiation syndrome in mice to test the radioprotective effect of rMnSOD. Male (CBAxC57B16) F1 SPF mice with the average weight of 24 g were exposed to 171 MeV proton beam at the dose of 4 Gy and then subcutaneously treated with either rMnSOD or sodium chloride physiological solution.

(167) Results

(168) After irradiation, the sixfold daily subcutaneous treatment with rMnSOD (long), has provided a statistically significant acceleration of the recovery of thymus and spleen mass and of the number of leukocytes in mice peripheral blood. In contrast, mice irradiated and treated with physiological solution did not demonstrate these positive effects at seventh day after exposure. The number of nucleated cells in bone marrow of irradiated mice has even exceeded its basal level in the control group seven days after irradiation. The rMnSOD-treated group has thus demonstrated a significant hyper restoration of their normal characteristic.

(169) TABLE-US-00011 TABLE VII Treatment of animals in the presence of rMnSOD (long) Number of Number of Mitotic aberrant Time after Body Spleen Thymus BMC, leukocytes in PB, index in bone mitoses in bone irradiation Group mass, g mass, mg mass, mg N 106/femur N 109/L marrow cells, % marrow cells, % 43 h Control 26.4 1.5 126.8 30.5 21.4 9.0 49.4 5.6 9.3 + 2.0 2.5 0.9 2.2 3.2 One-time treated with 24.8 1.3 29.0 5.1 11.8 1.3 22.9 2.4 0.9 0.3 1.3 0.1 47.6 2.8 rMnSOD immediately after irradiation One-time treated with 24.2 1.5 31.8 1.9 11.5 1.0 24.2 1.7 0.9 0.3 1.3 0.2 45.9 8.1 SCPS immediately after irradiation Day 7 One-time treated with 24.6 1.1 34.8 3.1 14.8 3.4 63.1 1.0 4.5 0.4 1.6 0.3 26.7 3.3 rMnSOD immediately after irradiation One-time treated with 24.8 0.8 33.2 9.5 11.7 1.5 64.7 4.9 6.1 1.9 1.5 0.2 22.7 2.9 SCPS immediately after irradiation Sixfold daily treated 25.2 1.9 62.2 16.2 39.0 18.1 79.5 1.7 7.4 0.4 1.5 0.3 29.5 4.8 with rMnSOD Sixfold daily treated 24.6 1.3 32.4 3.4 13.0 6.2 67.9 2.6 5.3 1.2 1.3 0.2 29.4 10.5 with SCPS

(170) Irradiation, of different animal groups subcutaneously treated either with rMnSOD solution (1 g per 0.5 mL) or sodium chloride physiological solution (SCPS) in the volume of 0.5 mL. Three groups of irradiated animals received rMnSOD. Two of them were treated only once immediately after irradiation and were tested after 43 h and 7 days respectively. The third group received sixfold daily treatments with rMnSOD starting with a first injection right after irradiation and was tested at seventh day after exposure. Three other irradiated groups which received SCPS were treated and tested at the same periods of time as the rMnSOD ones. The control unirradiated group did not receive any treatment.

(171) The results on the state of organs of the immune system and hemopoiesis indicate the therapeutic effect of rMnSOD in treating the acute radiation disease induced by a sublethal dose of proton irradiation.

(172) The same effects were observed with rMnSOD short form.

(173) Then rMnSOD long and short forms are useful for the treatment and/or prevention of damages induced by a sublethal dose of proton irradiation.

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