Oncolytic heterologous recombinant newcastle disease virus, preparation method and application thereof

Abstract

Provided are an oncolytic heterologous recombinant Newcastle disease virus (NDV), preparation method and application thereof. The heterologous recombinant NDV can express alpha (1,3) galactosyltransferase (1,3GT). The 1,3GT is the protein represented by the flowing B1) and B2): B1) the protein has an amino acid sequence of SEQ ID No.1; and B2) the protein is derived from B1) and has a function of 1,3GT obtained by substituting and/or deleting and/or adding one or more amino acid residue(s) in the amino acid sequence represented by SEQ ID No.1. The recombination NDV can be used for tumor treatment.

Claims

1. A recombinant Newcastle disease virus that has an expression of 1,3galactosyltransferase (1,3 GT); the recombinant Newcastle disease virus is a negative-stranded RNA virus; an RNA complementary to the negative-stranded RNA is transcribed from the negative-stranded RNA of the recombinant Newcastle disease virus, wherein the complementary RNA is a positive-stranded RNA that contains RNA for coding NP of the Newcastle disease virus, RNA for coding P of the Newcastle disease virus, RNA for coding M of the Newcastle disease virus, RNA for coding F of the Newcastle disease virus, RNA for coding HN of the Newcastle disease virus, RNA for coding L of the Newcastle disease virus and RNA for coding the 1,3galactosyltransferase.

2. The recombinant Newcastle disease virus of claim 1, wherein the 1,3galactosyltransferase (1,3GT) is one of following proteins B1) and B2): B1) a protein with an amino acid sequence of SEQ ID No.1; B2) a protein derived from B1) by replacing and/or deleting and/or adding one amino acid residue in the amino acid sequence shown by the SEQ ID No.1, wherein the derived protein has the function of the 1,3galactosyltransferase (1,3GT).

3. The recombinant Newcastle disease virus of claim 1, wherein the RNA that codes the 1,3galactosyltransferase is located between the RNAs that respectively code the P of the Newcastle disease virus and the M of the Newcastle disease virus.

4. The recombinant Newcastle disease virus of claim 1, wherein a sequence of the positive-stranded RNA is obtained by replacing T with U and remaining other nucleotides unchanged in a sequence corresponding to SEQ ID No. 2 of a sequence table.

5. The recombinant Newcastle disease virus of claim 1, wherein a genome of the recombinant Newcastle disease virus is a single-stranded ribonucleic acid which is obtained by replacing T with U and remaining other nucleotides unchanged in a reversed complementary strand with respect to a single strand shown by SEQ ID No. 2.

6. A genome of a recombinant Newcastle disease virus of claim 1; wherein the recombinant Newcastle disease virus is a negative-stranded RNA virus; an RNA complementary to the negative-stranded RNA is transcribed from the negative-stranded RNA of the recombinant Newcastle disease virus, wherein the complementary RNA is a positive-stranded RNA that contains RNA for coding NP of the Newcastle disease virus, RNA for coding P of the Newcastle disease virus, RNA for coding M of the Newcastle disease virus, RNA for coding F of the Newcastle disease virus, RNA for coding HN of the Newcastle disease virus, RNA for coding L of the Newcastle disease virus and RNA for coding the 1,3galactosyltransferase.

7. The genome of claim 6, wherein the 1,3galactosyltransferase (1,3GT) is one of following proteins B1) and B2): B1) a protein with an amino acid sequence of SEQ ID No.1; B2) a protein derived from B1) by replacing and/or deleting and/or adding one amino acid residue in the amino acid sequence shown by the SEQ ID No.1, wherein the derived protein has the function of the 1,3galactosyltransferase (1,3GT).

8. The genome of claim 1, wherein the RNA that codes the 1,3galactosyltransferase is located between the RNAs that respectively code the P of the Newcastle disease virus and the M of the Newcastle disease virus.

9. The genome of claim 1, wherein a sequence of the positive-stranded RNA is obtained by replacing T with U and remaining other nucleotides unchanged in a sequence corresponding to SEQ ID No. 2 of a sequence table.

10. The genome of claim 6, wherein a sequence of the genome of the recombinant Newcastle disease virus is a single-stranded ribonucleic acid which is obtained by replacing T with U and remaining other nucleotides unchanged in a reversed complementary strand with respect to a single strand shown by SEQ ID No. 2.

11. A vaccine for treating and/or preventing tumor of any of P1)-P4): P1) a vaccine for treating and/or preventing tumor prepared using the recombinant Newcastle disease virus of claim 1; P2) a vaccine for treating and/or preventing tumor prepared using the genome of the recombinant Newcastle disease virus of claim 1; P3) a vaccine for treating and/or preventing tumor prepared using a recombinant vector containing DNA molecules for coding a positive-stranded RNA of the recombinant Newcastle disease virus of claim 1, a recombinant microorganism containing the recombinant vector having DNA molecules for coding a positive-stranded RNA, a recombinant microorganism containing DNA molecules for coding a positive-stranded RNA, a transgenic animal cell line containing DNA molecules for coding a positive-stranded RNA, a transgenic animal cell line containing the recombinant vector having DNA molecules for coding a positive-stranded RNA, a transgenic animal tissue containing DNA molecules for coding a positive-stranded RNA, a transgenic animal tissue containing the recombinant vector having DNA molecules for coding a positive-stranded RNA, a transgenic animal organ containing DNA molecules for coding a positive-stranded RNA, and/or a transgenic animal organ containing the recombinant vector having DNA molecules for coding a positive-stranded RNA; P4) a vaccine for treating and/or preventing tumor prepared by microorganism, animal cell line, animal tissue and/or tissue organ containing the recombinant Newcastle disease virus of claim 1.

12. A drug for treating and/or preventing tumor of any of P1)-P4): P1) a drug for treating and/or preventing tumor prepared using the recombinant Newcastle disease virus of claim 1; P2) a drug for treating and/or preventing tumor prepared using the genome of the recombinant Newcastle disease virus of claim 1; P3) a drug for treating and/or preventing tumor prepared using a recombinant vector containing DNA molecules for coding a positive-stranded RNA of the recombinant Newcastle disease virus of claim 1, a recombinant microorganism containing the recombinant vector having DNA molecules for coding a positive-stranded RNA, a recombinant microorganism containing DNA molecules for coding a positive-stranded RNA, a transgenic animal cell line containing DNA molecules for coding a positive-stranded RNA, a transgenic animal cell line containing the recombinant vector having DNA molecules for coding a positive-stranded RNA, a transgenic animal tissue containing DNA molecules for coding a positive-stranded RNA, a transgenic animal tissue containing the recombinant vector having DNA molecules for coding a positive-stranded RNA, a transgenic animal organ containing DNA molecules for coding a positive-stranded RNA, and/or a transgenic animal organ containing the recombinant vector having DNA molecules for coding a positive-stranded RNA; P4) a drug for treating and/or preventing tumor prepared by microorganism, animal cell line, animal tissue and/or tissue organ containing the recombinant Newcastle disease virus of claim 1.

13. The drug for treating and/or preventing tumor of claim 12, wherein the tumor comprises malignant solid tumor including lung cancer and/or liver cancer and/or prostate cancer and/or pancreatic cancer, and comprises blood cancer including leukemia.

14. The drug for treating and/or preventing tumor of claim 12, wherein the 1,3galactosyltransferase (1,3GT) is one of following proteins B1) and B2): B1) a protein with an amino acid sequence of SEQ ID No.1; B2) a protein derived from B1) by replacing and/or deleting and/or adding one or more amino acid residue in the amino acid sequence shown by the SEQ ID No.1, wherein the derived protein has the function of the 1,3galactosyltransferase (1,3GT).

15. The drug for treating and/or preventing tumor of claim 12, wherein the RNA that codes the 1,3galactosyltransferase is located between the RNAs that respectively code the P of the Newcastle disease virus and the M of the Newcastle disease virus.

16. The drug for treating and/or preventing tumor of claim 12, wherein a sequence of the positive-stranded RNA is obtained by replacing T with U and remaining other nucleotides unchanged in a sequence corresponding to SEQ ID No. 2 of a sequence table.

17. The drug for treating and/or preventing tumor of claim 12, wherein a sequence of the genome of the recombinant Newcastle disease virus is a single-stranded ribonucleic acid which is obtained by replacing T with U and remaining other nucleotides unchanged in a reversed complementary strand with respect to a single strand shown by SEQ ID No. 2.

18. The drug for treating and/or preventing tumor of claim 12, wherein the recombinant vector is pathogenic microorganism for recombining 1,3galactosyltransferase gene; the tumor comprises malignant tumor including lung cancer and/or breast cancer and/or liver cancer and/or intestinal cancer and/or prostate cancer and/or pancreatic cancer and/or leukemia.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 schematically illustrates an NDV/1,3GT having an inserted 1,3GT gene.

(2) FIG. 2 illustrates an RT-PCR result for an NDV/1,3GT, where an electrophoresis lane M represents a DNA marker DL2000, an electrophoresis lane 1 represents a strain of Newcastle disease virus (NDV) JS/07/04/Pi, and an electrophoresis lane 2 represents the NDV/1,3GT.

(3) FIGS. 3A and 3B illustrate an expression result for 1,3GT of an NDV/1,3GT, where FIG. 3A shows an immunofluoresence test result for A549 infected by the NDV/1,3GT, and FIG. 3B shows an immunofluoresence test result for A549 infected by the strain of Newcastle disease virus (NDV) JS/07/04/Pi.

(4) FIG. 4 illustrates respective lethal ratios of an NDV/1,3GT for killing human lung adenocarcinoma cells A549 and hepatoma carcinoma cells HepG2, where rNDV represents the NDV/-1,3GT, NC represents a negative control, and NDV represents a strain of Newcastle disease virus (NDV) JS/07/04/Pi.

(5) FIG. 5 illustrates tumor treatment effect of an NDV/1,3GT on SCID mice having reconstructed human immune system and human lung adenocarcinoma, where rNDV represents the NDV/1,3GT, NC represents a PBS control, and NDV represents a strain of Newcastle disease virus (NDV) JS/07/04/Pi.

DETAILED DESCRIPTION

(6) Below this disclosure is further described in detail with reference to specific implementations. Those embodiments herein are merely for explaining this disclosure rather than limiting the scope of this disclosure.

(7) Those experimental methods in the following embodiments can be corresponding conventional methods without special definition.

(8) Those materials and reagents used in the following embodiments can be commercially purchased without special definition.

(9) Those SCID mice in the following embodiments are obtained from Beijing Weitonglihua Experimental Animal Technology Co., Ltd.

(10) Those hepatoma carcinoma cells HepG2 in the following embodiments are purchased from ATCC cell bank with an article number of HB-8065.

(11) Those human lung adenocarcinoma cells A549 in the following embodiments are purchased from ATCC cell bank with an article number of CCL-185.

(12) Those transcription vectors TVT/071204, pCI-NP, pCI-P, pCI-L, BSR-T7/5 and a strain of Newcastle disease virus (NDV) JS/07/04/Pi in the following embodiments (Construction and Rescue of infectious cDNA Clone of Pigeon-Origin Newcastle Disease Virus Strain JS/07/04/Pi, Chinese Journal of Virolory, 2012, 28(1):67-72.) are gifted from a key open laboratory of livestock and poultry epidemiology of Ministry of Agriculture. These biological materials are only used for relevant experiments in this disclosure, while they can not be used for any other purposes. The transcription vector TVT/071204 contains full-length cDNA of genome of the strain of Newcastle disease virus (NDV) JS/07/04/Pi.

(13) PBS in the following embodiments is 0.01M PBS (Ph 7.2), and its preparation method is as follows: dissolving 8.00 g sodium chloride (NaCl), 0.20 g potassium chloride (KCl), 1.44 g disodium hydrogen phosphate (Na.sub.2HPO.sub.4) and 0.24 g potassium phosphate monobasic KH.sub.2PO.sub.4 in 800 mL deionized water, regulating by concentrated hydrochloric acid pH value of the solution to pH 7.2, adding deionized water to 1 L and performing autoclaved sterilization on the solution (121 C., 15-20 min).

(14) ISOLECTIN GS-IB4 in the following embodiments is a product with an article number of I32450 from Invitrogen Company. The ISOLECTIN GS-IB4 here is bonded with Alexa Fluor 647.

First Embodiment: Recombinant Newcastle Disease Virus (Recombinant NDV) and its Function

(15) 1. Preparation of Recombinant Newcastle Disease Virus.

(16) The recombinant NDV carrying 1,3GT gene is constructed by reference to methods in the following literatures including Rescue and Preliminary Application of a Recombinant Newcastle Disease Virus Expressing Green Fluorescent Protein Gene, Virologica Sinica, 2007, 22 (1):34-40 and Construction and Rescue of infectious cDNA Clone of Pigeon-Origin Newcastle Disease Virus Strain JS/07/04/Pi, Chinese Journal of Virolory, 2012, 28(1):67-72. Specifically, 1,3GT gene of a pig is cloned to genome of TVT/071204 to obtain recombinant vector TVT07+. Co-transfection through three helper plasmids pCI-NP, pCI-P and pCI-L and the recombinant vector TVT07+ is carried out for BSR-T7/5 cells, which are then transferred after the 60 h co-transfection to repeated freeze thawing for three times at 70 C. After that, the frozen and thawed cells and their supernatants are used to inoculate SPF chick embryo of 9-11 days-age according to 0.2 ml/embryo, and the chick embryo becoming dead within 24 hours is discarded. Allantoic fluid of the chick embryo that dies after 24 hours is collected, and both hemagglutination (HA) test and hemagglutination inhibition (HI) test are performed according to OIE standards on the collected allantoic fluid. The samples having positive HA test result and HI test result contain the recombinant Newcastle disease virus (recombinant NDV) that are saved successively.

(17) The allantoic fluid having positive HA test result and HI test result is propagated on the SPF chick embryo for three generations. The allantoic fluid is then collected to obtain the recombinant Newcastle disease virus (recombinant NDV) expressing 1,3GT gene, which is called as NDV/1,3GT.

(18) 2. RT-PCR of NDV/1,3GT.

(19) RNA of the NDV/1,3GT is extracted according to an instruction of Trizol reagent to obtain total RNA of the NDV/1,3GT. Reverse transcription is carried out taking the total RNA of the NDV/1,3GT as a template to obtain NDV/1,3GT cDNA. Total RNA of the strain of Newcastle disease virus (NDV) JS/07/04/Pi is extracted to obtain the total RNA of the NDV. Another reverse transcription is carried out taking the total RNA of the NDV as a template to obtain NDV cDNA. PCR is performed using the NDV/1,3GT cDNA and NDV cDNA as the template and using P1-1: 5-GACACAGAGGGGTGAAATGACACTC-3 and P3-2: 5-TAGACATCCTTCCTCGGCACTACAGT-3 as a primer pair, where an amplification product is analyzed using 1% agarose gel electrophoresis. The analysis result is shown in FIG. 2, where an electrophoresis lane M represents a DNA marker DL2000, an electrophoresis lane 1 represents a PCR product of cDNA of the strain of Newcastle disease virus (NDV) JS/07/04/Pi of which a target fragment size is about 1 kb, and an electrophoresis lane 2 represents a PCR product of cDNA of the NDV/1,3GT of which a target fragment size is about 2 kb. The amplification products are collected for sequencing, where the sequencing result shows that the genome of NDV/1,3GT is a single-stranded ribonucleic acid which is obtained by replacing T with U and remaining other nucleotides unchanged in a reversed complementary strand with respect to the single-stranded ribonucleic acid shown by SEQ ID No. 2, where, the 1,3GT gene is successively inserted between P and M of the NDV, and its insert location is shown in FIG. 1. Here, SEQ ID No.2 is composed of 16332 nucleotides, where the 122.sup.nd-1591.sup.st nucleotides in the SEQ ID No.2 of the sequence table are a coding sequence of nuclear protein (NP) of the NDV; the 1893.sup.rd-3080.sup.th nucleotides in the SEQ ID No.2 are a coding sequence of phosphoprotein (P) of the NDV; the 4436.sup.th-5530.sup.th nucleotides in the SEQ ID No.2 are a coding sequence of matrix protein (M) of the NDV; the 5690.sup.th-7351.sup.st nucleotides in the SEQ ID No.2 are a coding sequence of fusion protein (F) of the NDV; the 7558.sup.th-9273.sup.rd nucleotides in the SEQ ID No.2 are a coding sequence of hemagglutinin neuraminidase protein (HN) of the NDV; the 9527.sup.th-16141.sup.st nucleotides in the SEQ ID No.2 are a coding sequence of large polymerase protein (L) of NDV; the 3193.sup.rd-4308.sup.th nucleotides in the SEQ ID No.2 are a coding sequence of 1,3galactosyltransferase (1,3GT) that codes the protein shown by SEQ ID No.1 of the sequence table.

(20) The NDV/1,3GT is a negative-stranded RNA virus, where an RNA complementary to the negative-stranded RNA (i.e., a positive-stranded RNA) is transcribed based on the negative-stranded RNA of the NDV/1,3GT. The positive-stranded RNA contains RNA molecules that respectively code NP of the Newcastle disease virus, P of the Newcastle disease virus, M of the strain of Newcastle disease virus, F of the strain of Newcastle disease virus, HN of the strain of Newcastle disease virus, L of the strain of Newcastle disease virus and the 1,3galactosyltransferase, where the 1,3galactosyltransferase is the protein having the amino acid sequence of the SEQ ID No.1.

(21) 3. Expression of 1,3GT of the NDV/1,3GT.

(22) The NDV/1,3GT of the step 1 is inoculated into human lung adenocarcinoma cells A549 to obtain the A549 cells infected by the NDV/1,3GT. The strain of Newcastle disease virus (NDV) JS/07/04/Pi is also inoculated into the human lung adenocarcinoma cells A549 to obtain the A549 cells infected by the NDV. The expression of the 1,3GT within the A549 cells infected by the recombinant Newcastle disease virus is detected using an immumofluorescence method, and includes the following steps:

(23) 1) 1 mg/mL ISOLECTIN GS-IBS is prepared by dissolving 500 g ISOLECTIN GS-IB4 using 500 L diluents, where the diluents (pH 7.2) are 0.01 M PBS containing 1.0 mM CaCl.sub.2 and 2 mM sodium azide. The 1 mg/mL ISOLECTIN GS-IBS is subpackaged per 5 L or 10 L, and it is kept in dark place at 20 C. to avoid repeated freeze thawing. The ISOLECTIN GS-IBS is dissolved and centrifuged immediately before its usage, and the supernatant is diluted by 100 times using the 0.01M PBS to obtain the diluted GS-IB4. It is noted that those operations are performed in a dark condition.

(24) 2) 110.sup.5 A549 cells are tiled within a confocal dedicated vessel (which is a culture dish with a glass bottom of 35 mm, an aperture of 10 mm and a glass thickness of 0.085-0.13 mm). When the cell density becomes 60%-70% of the vessel bottom, the NDV/1,3GT of the step 1 is inoculated. After the cells are infected by the virus for 60 h, the A549 cells infected by the NDV/1,3GT are obtained. The A549 cells infected by the NDV/1,3GT are taken out of an incubator, the culture medium is discarded, the cells are washed for two times using PBS (while being cautious of cell dropping) and then fixed by 4% paraformaldehyde (which covers the whole bottom of the confocal vessel) for 20 min under the room temperature, where the fixed cells are washed by the PBS for three times (3 min/time).

(25) 3) 0.2% Triton X-100 is added till covering the whole bottom of the confocal vessel, and permeabilization lasts for 10 min. After that, the vessel is washed using the 1PBS for three times (3 min/time).

(26) 4) 2% calf serum is added (which covers the whole bottom of the confocal vessel) for blocking the cells for 30 min under the room temperature.

(27) 5) The blocking liquid is discarded and the cells are washed using the PBS for three times (3 min/time). The diluted GS-IB4 is added till covering the whole bottom of the confocal vessel, and the cells are incubated within a humid box for 3 h at 4 C. A blank control group is added with PBS to replace the dilute GS-IB4. The addition of the diluted GS-IB4 and the PBS should be performed in a dark environment. The cells are then washed using PBS for three times (5 min/time) in a dark environment.

(28) 6) Those cells are observed and photographed under a confocal fluorescence microscope.

(29) According to such immumofluorescence method contains step 1)-6), the NDV/1,3GT is replaced by the strain of Newcastle disease virus (NDV) JS/07/04/Pi to act as the negative control group.

(30) The 1,3GT expressed in the A549 cells infected by the NDV/1,3GT may be catalyzed to generate -Gal, where -Gal can be bonded with the lectin ISOLECTIN GS-IB4 marked by Alexa Fluor 647 to emit red fluorescence (A in FIGS. 3A and 3B). There is no fluorescence in the negative control group (B in FIGS. 3A and 3B). Those results indicate that the A549 cells infected by the NDV/1,3GT express the 1,3GT protein.

Second Embodiment: Lethal Effect of NDV/1,3GT on Tumor Cells

(31) The tests are repeated for three times. Specific steps for each test are described below.

(32) Trypsinization is carried out on the human lung adenocarcinoma cells A549 to obtain dissociated A549. The cell density is adjusted using cell counting. The dissociated A549 cells are inoculated to a 48-well plate with DMEM culture medium containing 10% fetal calf serum according to a standard of 510.sup.4 cells in each well, and are cultured within an incubator at 37 C. for 24 h. The A549 cells are respectively inoculated according to 0.25 MOI with the NDV/1,3GT and the strain of Newcastle disease virus (NDV) JS/07/04/Pi in the first embodiment, while the cells without virus inoculation are used as the negative control group. After the virus inoculation for 5 h, 200 l human serum is added into each well; the cells are cultured at 37 C. for 48 h within the incubator, and trypan blue staining is performed for the cells for cell counting, so as to calculate the lethal ratio of the NDV/1,3GT on the A549 cells (i.e., cell death rate) (FIG. 4).

(33) The human lung adenocarcinoma cells A549 are replaced by hepatoma carcinoma cells HepG2, while other operations remain unchanged as the second embodiment. The lethal ratio of the NDV/1,3GT on the hepatoma carcinoma cells HepG2 is calculated (FIG. 4).

(34) The test results show, the lethal ratios of the NDV/1,3GT on the A549 cells and the HepG2 cells are respectively 79.8% and 75%; the lethal ratios of the strain of Newcastle disease virus (NDV) JS/07/04/Pi on the A549 cells and the HepG2 cells are respectively 45.2% and 40%. The death rates of the A549 cells and the HepG2 cells in the negative control group are respectively 3.2% and 6%. The lethal ratio of the NDV/1,3GT on the A549 cells is 1.76 times higher than that of the strain of Newcastle disease virus (NDV) JS/07/04/Pi, and the lethal ratio of the NDV/1,3GT on the HepG2 cells is 1.88 times higher than that of the strain of Newcastle disease virus (NDV) JS/07/04/Pi. Those test results show that the NDV/1,3GT has better lethal effect on the tumor cells.

Third Embodiment, Treatment Effect of Recombinant NDV on Tumor

(35) Human immune system is reconstructed for SCID mice that are then inoculated with the human lung adenocarcinoma cells A549. The SCID mice with reconstructed human immune system and inoculated human lung cancer are treated by the NDV/1,3GT. This experiment is repeated for three times, while specific steps for the experiment are described below.

(36) The NDV/1,3GT of the first embodiment is re-suspended using the PBS to obtain an NDV/1,3GT suspension liquid with a titer of 2.510.sup.5 pfu/100 l. The strain of Newcastle disease virus (NDV) JS/07/04/Pi is re-suspended using the PBS to obtain a JS/07/04/Pi suspension liquid with a titer of 2.510.sup.5 pfu/100 l.

(37) Hypodermic inoculation is performed at a right underarm for each of twenty 6-week-aged SCID mice, where 110.sup.7 human lung adenocarcinoma cells A549 are inoculated into each SCID mouse. A major axis and a minor axis of the tumor are measured twice every week, and a volume of the tumor is calculated following a formula TV=1/2ab.sup.2. After the human lung adenocarcinoma cells A549 have been inoculated for 15 days, 100 l NDV/1,3GT suspension liquid (which has a titer of 2.510.sup.5 pfu/100 l for the NDV/1,3GT therein) is injected into each mouse through its caudal vein. The day on which the NDV/1,3GT is injected for the first time is recorded as 0.sup.th treatment day. On a 3.sup.rd treatment day, 110.sup.7 human peripheral blood lymphocytes (PBMC) are injected into each mouse through intraperitoneal injection, and 200 l human serum is injected into each mouse through its caudal vein. 100 l NDV/1,3GT suspension liquid (which has a titer of 2.510.sup.5 pfu/100 l for the NDV/1,3GT) is respectively injected into each mouse through its caudal vein on a 10.sup.th treatment day, a 14.sup.th treatment day and a 21.sup.st treatment day. 110.sup.7 human peripheral blood lymphocytes (PBMC) are respectively injected into each mouse through intraperitoneal injection and 200 l human serum is injected into each mouse through its caudal vein on a 10.sup.th treatment day, a 17.sup.th treatment day and a 24.sup.th treatment day. The tumor volume (cm.sup.3) is recorded for each mouse from the 0.sup.th treatment day (i.e., the 1.sup.st week), and the tumor volume (cm.sup.3) is measured for each mouse on a 7.sup.th treatment day (i.e., the 2.sup.nd week), a 14.sup.th treatment day (i.e., the 3.sup.rd week), a 24.sup.th treatment day (i.e., the 4.sup.th week), a 28.sup.th treatment day (i.e., the 5.sup.th week), a 35.sup.th treatment day (i.e., the 6.sup.th week), a 42.sup.nd treatment day (i.e., the 7.sup.th week), a 49.sup.th treatment day (i.e., the 8.sup.th week), a 56.sup.th treatment day (i.e., the 9.sup.th week), a 63.sup.rd treatment day (i.e., the 10.sup.th week), a 70.sup.th treatment day (i.e., the 11.sup.th week), a 77.sup.th treatment day (i.e., the 12.sup.th week), a 84.sup.th treatment day (i.e., the 13.sup.th week), a 91.sup.st treatment day (i.e., the 14.sup.th week) and a 98.sup.th treatment day (i.e., the 15.sup.th week). Average tumor volumes when the NDV/1,3GT is used to treat the tumor are shown in FIG. 5 and table 1.

(38) The NDV/1,3GT suspension liquid is replaced by the JS/07/04/Pi suspension liquid, while other operations remain unchanged as the third embodiment. Average tumor volumes when treating the tumor with the JS/07/04/Pi suspension liquid are recorded (FIG. 5 and table 1).

(39) The NDV/1,3GT suspension liquid is replaced by the PBS, while other operations remain unchanged as the third embodiment. Average tumor volumes when treating the tumor with the PBS are recorded (FIG. 5 and table 1).

(40) Table 1, treatment effect of NDV/1,3GT on SCID mice with reconstructed human immune system and inoculated human lung cancer (cm.sup.3)

(41) TABLE-US-00001 Strain of Newcastle disease virus (NDV) Treatment Time PBS JS/07/04/Pi NDV/1,3GT 1.sup.st week 0.009755 0.008795 0.008125 2.sup.nd week 0.02872 0.01972 0.01404 3.sup.rd week 0.078 0.058 0.01404 4.sup.th week 0.29952 0.196 0.13104 5.sup.th week 0.52 0.345 0.24206 6.sup.th week 0.624 0.43 0.31616 7.sup.th week 1.01088 0.879 0.3328 8.sup.th week 1.42155 1.11 0.36608 9.sup.th week 1.74928 1.489 0.5265 10.sup.th week 1.989 1.769 0.46332 11.sup.th week 2.46272 1.99 0.50544 12.sup.th week 2.52928 2.234 0.50544 13.sup.th week 2.39616 2.11 0.5265 14.sup.th week 2.39616 2.05 0.39936 15.sup.th week 2.477475 2 0.36608

(42) The calculation results show that, the volume of the tumor that is treated by the strain of Newcastle disease virus (NDV) JS/07/04/Pi for 15 weeks is 5.46 times larger than that of the tumor treated by the NDV/1,3GT, and the volume of the tumor that is treated by the PBS for 15 weeks is 6.77 times larger than that of the tumor treated by the NDV/1,3GT. Therefore, the NDV/1,3GT can treat the tumor.

INDUSTRIAL APPLICATION

(43) The recombinant NDV in this disclosure has stronger lethal effect on tumor cells: the lethal effects on A549 cells and the HepG2 cells of the recombinant NDV are 1.76 times and 1.88 times higher than those of NDV. The recombinant NDV in this disclosure can treat the tumor: the volume of the tumor that is treated by NDV is 5.46 times larger than that of the tumor treated by the recombinant NDV, and the volume of the tumor that is treated by the PBS is 6.77 times larger than that of the tumor treated by the recombinant NDV. Those experiments prove that the recombinant NDV of this disclosure can be used for tumor treatment.