VESICLE AND USE THEREOF

Abstract

Provided are a vesicle and the use thereof. The vesicle is an induced vesicle, and the sources thereof include stem cells or somatic cells, and the possessed markers include Syntaxin 4. Compared with an exosome in mesenchymal stem cells, the vesicle can specifically express Syntaxin 4 and can be used to distinguish characteristic markers of MSC-derived vesicles and exosomes. The vesicle can play a procoagulant effect in vitro, can improve the bleeding tendency of mice with hemophilia after in vivo injection, and can be used for the treatment of improving the bleeding tendency of hemophilia. In addition, the vesicle can be expelled through the skin and hair.

Claims

1. A vesicle, characterized in that, the vesicle is an induced vesicle, the vesicle is derived from sources comprises stem cells or somatic cells, and the vesicle has markers comprising Syntaxin 4.

2. The vesicle of claim 1, characterized in that, the somatic cells comprise primary cultured cells or cell lines; preferably, the somatic cells comprise osteoblast cell lines; more preferably, the cell line refers to an immortalized cell culture which is capable of propagating indefinitely in an appropriate fresh medium and space; preferably, the stem cells comprise totipotent stem cells and pluripotent stem cells; preferably, the stem cells comprise mesenchymal stem cells and induced pluripotent stem cells; preferably, the induced vesicle refers to a vesicle produced by inducing apoptosis of normally viable stem cells or somatic cells by external impacts; preferably, the induced vesicle is produced by inducing stem cells or apoptosis of stem cells by addition of Staurospora, ultraviolet irradiation, starvation, or thermal stress, or a combination of one or more thereof; preferably, the possessed markers of the vesicle further comprise one or more of Annexin V, Flotillin-1, Cadherin 11, and Integrin alpha 5; further preferably, the vesicle has a combination of the markers Syntaxin 4, Annexin V, Flotillin-1, Cadherin 11, and Integrin alpha 5; further preferably, the vesicle has a high expression of the markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4; or preferably, the expression levels of the markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 in the vesicle are higher than that in MSCs or exosomes; or preferably, the expression levels of the markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 in the vesicle are 1-2 fold, 2-3 fold, 1-3 fold, 3-4 fold and 2-6 fold, respectively, of that in exosomes derived from mesenchymal stem cells; more preferably, the expression levels of the markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 in the vesicle is 1.5-2 fold, 2.5-3 fold, 1.5-2.5 fold, 3.5-4 fold and 3.5-5 fold, respectively, of that in exosomes derived from mesenchymal stem cells; still more preferably, the expression levels of the markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 in the vesicle are 1.5-1.9 fold, 2.5-2.9 fold, 1.8-2.5 fold, 3.5-3.9 fold and 4-5 fold, respectively, of that in exosomes derived from mesenchymal stem cells; still more preferably, the vesicle and the exosomes are derived from mesenchymal stem cells of the same source; or preferably, the vesicle also expresses CD29, CD44, CD73, and CD166; but does not express CD34, nor CD45; or preferably, the vesicle also expresses one or more of CD9, CD63, CD81, and C1q; or preferably, the vesicle is produced by inducing mesenchymal stem cells with staurosporine; preferably, the concentration of staurosporine is in a range of about 1-10000 nM; preferably, the concentration of staurosporine is in a range of about 100-10000 nM; preferably, the concentration of staurosporine is in a range of about 500-10000 nM; preferably, the concentration of staurosporine is in a range of about 500-1000 nM; further preferably, the concentration of staurosporine is in a range of about 500-900 nM; and further preferably, the concentration of staurosporine is in a range of about 500-800 nM.

3. The vesicle of claims 1-2, characterized in that, the vesicle has a diameter of about 0.03-6 .Math.M; preferably, the vesicle has a diameter of about 0.03-4.5 .Math.M; further preferably, the vesicle has a diameter of about 0.03-1 .Math.M; further preferably, the vesicle has a diameter of about 0.04-1 .Math.M; further preferably, the vesicle has a diameter of about 0.05-1 .Math.M; further preferably, the vesicle has a diameter of about 0.1-1 .Math.M; and further preferably, the vesicle has a diameter of about 0.15-1 .Math.M.

4. A vesicle combination, characterized by comprising the vesicle of any of claims 1-3; preferably, the proportion by count of the vesicle of any of claims 1-3 in the vesicle combination is about 65-100%; further preferably, the proportion by count of the vesicle of any of claims 1-3 in the vesicle combination is about 75-98%; more preferably, the proportion by count of the vesicle of any of claims 1-3 in the vesicle composition is about 80-96%; or preferably, the vesicle combination further comprises one or more of exosomes, migrants, microbubbles, and ectosomes.

5. A composition, characterized by, comprising a vesicle of any one of claims 1-3; or comprising the vesicle combination of claim 4; preferably, the composition includes drugs, foods, health products, cosmetics, additives, or intermediates; preferably, the composition is a drug; preferably, the composition further comprises a pharmaceutically or immunologically acceptable carrier; and more preferably, the composition is in a form selected from the group consisting of a lyophilized powder, an injection, a tablet, a capsule, a kit, or a patch.

6. A reagent or kit for screening or identification or extraction of a vesicle, characterized by comprising detection reagents for one or more of markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4; preferably, the detection reagents detect the expression levels of genes of the markers; further preferably, the detection reagents detect the expression levels of mRNAs of the markers; more preferably, the detection reagents for the markers detect the expression levels of proteins of the markers; or preferably, the detection reagents for the markers are one or more of fluorescent quantitative PCR dyes, fluorescent quantitative PCR primers, fluorescent quantitative PCR probes, antibodies, antibody functional fragments, and conjugated antibodies; or preferably, the kit is selected from one or more of a qPCR kit, an immunoblot assay kit, a flow cytometry assay kit, an immunohistochemical assay kit, and an ELISA kit; more preferably, the kit is selected from a flow cytometry assay kit; and preferably, the vesicle is an induced vesicle.

7. A method for selecting or identifying the vesicle of any one of claims 1-3, characterized by comprising testing a test sample with one or more of Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 as markers using detection reagents, preferably, the method employs a control reagent comprising one or more of exosomes, migrants, microbubbles, and ectosomes, and when the expression levels of the markers in the test sample is higher than that in the control reagent, the result is positive; preferably, the control reagent comprises an exosome; preferably, the marker is Syntaxin 4; and preferably, the vesicle is identified when the expression level of Syntaxin 4 in the test sample is greater than or equal to 2-6 fold of that in the exosome; more preferably, the vesicle is identified when the expression level of Syntaxin 4 in the test sample is greater than or equal to 3-6 fold, more preferably 4-5 fold of that in the exosome.

8. Use of a detection reagent for a marker in the preparation of a reagent or kit for detection or identification of a vesicle of any of claims 1-3, characterized in that, the markers comprise one or more of Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4, the reagent or kit further comprises a control reagent comprising one or more of exosomes, migrants, microbubbles, and ectosomes, and when the expression levels of the markers in the test sample is higher than that in the control reagent, the result is positive; preferably, the control reagent is an exosome; preferably, the vesicle is identified when the expression level of Syntaxin 4 in the test sample is greater than or equal to 2-6 fold of that in the exosome; more preferably, the vesicle is identified when the expression level of Syntaxin 4 in the test sample is greater than or equal to 3-6 fold of that in the exosome; and more preferably, the vesicle is identified when the expression level of Syntaxin 4 in the test sample is greater than or equal to 4-5 fold of that in the exosome.

9. Use of the vesicle of any of claims 1 to 3 or a vesicle combination of claim 4 in the preparation of a product for treatment or prevention or amelioration of a disease or a complication of the disease; the disease being a bleeding disorder; preferably, the bleeding disorder comprises bleeding due to deficiency of coagulation factors, decreased platelet count and/or functional defects; more preferably, the bleeding disorder comprises hemophilia, lupus hemorrhage, or Chediak-Higashi syndrome; more preferably, hemophilia comprises hemophilia A, hemophilia B, or hemophilia C; more preferably, the disease is hemophilia A; or preferably, the product comprises drugs, foods, health products, cosmetics, additives, or intermediates.

10. A method for production of the vesicle of any of claims 1 to 3, characterized by comprising inducing stem cells or somatic cells to produce the vesicle with an apoptosis-inducing agent; preferably, the method comprises the following steps: (1) culturing mesenchymal stem cells; (2) collecting the culture supernatant of the mesenchymal stem cells; and (3) separating a vesicle from the culture supernatant in step (2); preferably, the step of culturing mesenchymal stem cells in step (1) comprises: (4) separating mesenchymal stem cells from a tissue; and (5) adding a culture medium to culture the mesenchymal stem cells; and contacting the mesenchymal stem cells in the culture medium with the apoptosis inducing agent; further preferably, the apoptosis-inducing agent comprises staurosporine, ultraviolet irradiation, starvation, or thermal stress, or a combination of one or more thereof; more preferably, the apoptosis-inducing agent is staurosporine; preferably, the concentration of staurosporine is in a range of about 1-10000 nM; preferably, the concentration of staurosporine is in a range of about 100-10000 nM; preferably, the concentration of staurosporine is in a range of about 500-10000 nM; or more preferably, the concentration of staurosporine is in a range of about 500-1000 nM; still more preferably, the concentration of staurosporine is in a range of about 500-900 nM; and most preferably, the concentration of staurosporine is in a range of about 500-800 nM; further preferably, the cells are treated with the apoptosis inducing agent in step (5) for about 16-24 hours; or preferably, in step (3), separating a vesicle comprises separating a vesicle by ultracentrifugation; further preferably, the step of separating a vesicle by ultracentrifugation comprises: (a) performing a first centrifugation on the collected culture supernatant, and taking the supernatant; (b) performing a second centrifugation on the supernatant collected in step (a), and taking the supernatant; (c) performing a third centrifugation on the supernatant collected in step (b), and taking the pellet; and (d) performing a fourth centrifugation on the pellet collected in step (c), and taking the pellet; further preferably, the first centrifugation is performed at about 500-1500 g for about 5-30 min; more preferably, the first centrifugation is performed at about 500-1000 g for about 5-20 min; still more preferably, the first centrifugation is performed at about 500-900 g for about 5-15 min; further preferably, the second centrifugation is performed at about 1000-3000 g for about 5-30 min; more preferably, the second centrifugation is performed at about 1500-2500 g for about 5-20 min; still further preferably, the second centrifugation is performed at about 1500-2200 g for about 5-15 min; further preferably, the third centrifugation is performed at about 10000-30000 g for about 15-60 min; more preferably, the third centrifugation is performed at about 12000-25000 g for about 20-60 min; still further preferably, the third centrifugation is performed at about 12000-20000 g for about 20-40 min; further preferably, the fourth centrifugation is performed at about 10000-30000 g for about 15-60 min; more preferably, the fourth centrifugation is performed at about 12000-25000 g for about 20-60 min; and still more preferably, the fourth centrifugation is performed at about 12000-20000 g for about 20-40 minutes.

11. A method for enriching the vesicle of claims 1-3, characterized by comprising enriching the vesicle by a method of immunomagnetic beads, wherein the immunomagnetic beads are obtained by coupling an antibody to magnetic beads; and the antibody comprises an anti-Syntaxin 4 antibody; preferably, the antibody further comprises one or more of an anti-Annexin V antibody, an anti-Flotillin-1 antibody, an anti-Cadherin 11 antibody, and an anti-Integrin alpha 5 antibody.

12. The vesicle of claim 1-3, or the vesicle combination of claim 4, or the composition of claim 5, or the extraction reagent or extraction kit of claim 6, or the use of claim 8 or 9, or the method of claim 10 or 11, characterized in that, the mesenchymal stem cells are derived from a mammal; preferably, the mammal is selected from a human or a mouse; or preferably, the source of the mesenchymal stem cells comprises: bone marrow, urine, oral cavity, adipose, placenta, umbilical cord, periosteum, or a combination thereof; more preferably, the source of mesenchymal stem cells is selected from one or more of bone marrow, adipose, umbilical cord, and oral cavity.

13. A method for treatment or prevention or amelioration of a disease or a complication of the disease in a subject, comprising administering to the subject an effective amount of the vesicle of claims 1-3 or the vesicle combination of claim 4 or the composition of claim 5; wherein the disease is a bleeding disorder; preferably, the bleeding disorder comprises bleeding due to deficiency of coagulation factors, decreased platelet count and/or functional defects; more preferably, the bleeding disorder comprises hemophilia, lupus hemorrhage, or Chediak-Higashi syndrome; more preferably, hemophilia comprises hemophilia A, hemophilia B, or hemophilia C; and more preferably, the disease is hemophilia A.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0094] The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

[0095] FIGS. 1A-1E show the results of flow cytometry of surface markers of separated BMMSCs.

[0096] FIG. 2 shows an operation flow chart of Example 2.

[0097] FIG. 3 shows the statistics on the count of IEVs produced by MSCs (10.sup.6 MSCs) analyzed by flow cytometry.

[0098] FIGS. 4A-4F show diameter measurements of IEVs particles: FIG. 4A shows particle diameter distribution of flow cytometry of IEVs; FIG. 4B shows the scattered light intensity of side scatter (SSC) analysis of IEVs, indicating the particle diameter distribution of the IEVs; FIG. 4C shows the scattered light intensity of IEVs analyzed by standardized small particle microspheres produced by Bangs Laboratories, indicating the particle diameter distribution of IEVs; FIG. 4D shows IEVs observed by transmission electron microscopy (TEM), indicating the particle diameter distribution of IEVs; FIG. 4E shows Nanoparticle Tracking Analysis (NTA), indicating the particle diameter distribution of IEVs; and FIG. 4F shows particle size measurements of IEVs at the single-vesicle level using a nano-flow cytometry technique, indicating the particle diameter distribution of IEVs.

[0099] FIGS. 5A-5K show the results of surface membrane protein analysis of IEVs by flow cytometry.

[0100] FIGS. 6A-6D show the content analysis of IEVs: FIG. 6A shows the results of proteomic quantitative analysis of MSCs, MSCs-exosomes and MSCs-IEVs by the DIA quantitative technique; FIG. 6B shows a heat map drawn by screening for IEVs-specific highly expressed proteins; FIG. 6C shows the results of GO enrichment analysis of differential proteins, indicating the expressions of Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 molecules in IEVs; and FIG. 6D shows the results of Western Blot verification of the expressions of Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4, in MSCs, MSCs-exosomes, and MSCs-IEVs.

[0101] FIG. 7 shows the in vivo procoagulant effect of IEVs in hemophilia A mice.

[0102] FIGS. 8A-8D show changes in coagulation factor levels following IEVs injection in hemophilia A mice. FIG. 8A shows the change in the coagulation factor VIII; FIG. 8B shows the change in the vWF factor. FIG. 8C shows the change in the tissue factor (TF); FIG. 8D shows the change in prothrombin.

[0103] FIGS. 9A-9B show the impacts of blocking PS and TF of IEVs on in vivo treatment of IEVs in a hemophilia A mice model. FIG. 9C shows that treatment of 1pr mice with IEVs injection significantly improved the bleeding tendency of 1pr mice. FIG. 9D shows that the treatment of CHS mice with IEVs injection significantly improved the bleeding tendency of CHS mice.

[0104] FIG. 10 shows a comparison of treatment of hemophilia A mice with IEVs and exosomes derived from the same MSCs source.

[0105] Note: [0106] WT is a wild-type mouse; [0107] HA group is a hemophilia A mice model; [0108] HA+IEVs is a hemophilia A mice model administered with IEVs treatment; [0109] HA+PS-IEVs is a hemophilia A mouse model administered with PS-negative IEVs; [0110] HA+TF-IEVs is a hemophilia A mouse model administered with TF-negative IEVs; [0111] and HA+Exosomes is a hemophilia A mouse model administered with exosomes.

[0112] FIG. 11 shows morphologies of MC3T3-E1 and hBMMSCs-derived IEVs.

[0113] FIG. 12 shows the results of flow cytometry of particle diameter distribution of MC3T3-E1 and hBMMSCs-derived IEVs.

[0114] FIGS. 13A-13C show that the excretion of IEVs through the skin and hair: FIG. 13A shows the dynamic metabolism of IEVs at the skin surface. FIG. 13B shows the gradual migration of IEVs from the subcutaneous tissue to the dermis and epidermis over time. FIG. 13C shows the presence of PKH26-IEVs in hair follicles found in hairs removed from the surface of mice on Day 7.

[0115] FIG. 14 shows the death processes of hiPSCs and hUCMSCs taken by a High Content Cellular Imaging Analysis System.

[0116] FIG. 15 shows the apoptosis rates of hiPSCs and hUCMSCs induced to apoptosis analyzed by flow cytometry, demonstrating that most cells underwent apoptosis.

[0117] FIG. 16 shows that the positive rates of Annexin 5 expression by flow cytometry were over 80% for both hiPSCs and hUCMSCs.

[0118] FIG. 17 shows the particle sizes of two IEVs as measured by nanoparticle tracking analysis (NTA).

[0119] FIG. 18 shows the amount of IEVs produced by the two IEVs measured by nanoparticle tracking analysis (NTA).

[0120] FIG. 19 shows the potentials of two IEVs as measured by nanoparticle tracking analysis (NTA).

DETAILED DESCRIPTION

[0121] The embodiments of the present disclosure are further illustrated by the following specific examples, which are not intended to limit the scope of the disclosure. Certain insubstantial modifications and adaptations made by others in light of the disclosed concepts remain within the scope of the disclosure.

[0122] The IEVs in the examples of the present disclosure is an abbreviation for induced vesicles, and induced extracellular vesicles (IEVs). An induced extracellular vesicle refers to a subcellular product that is produced by intervening or inducing apoptosis of precursor cells (e.g. stem cells) which are normally viable. Such subcellular product generally has a membrane structure, expresses apoptotic markers, and partially contains the genetic material DNA. The inventors have found that the induced extracellular vesicle is a substance that distinguishes between cells and conventional extracellular vesicles (e.g. exosomes, etc.). In some embodiments, normal viable cells are, for example, non-apoptotic cells, non-senescent cells, non-senescent cells with arrested proliferation, non-post-cryopreservation cells, non-malignant cells with abnormal proliferation, or non-damaged cells, etc. In some embodiments, the normally viable cells are taken from cells at 80-100% confluence in the cell culture process. In some embodiments, the normally viable cells are taken from cells in the log phase. In some embodiments, the normally viable cells are taken from primary culture cells derived from a human or murine tissues and subculture cells thereof. In some embodiments, the normally viable cells are taken from an established cell line or cell strain. In some embodiments, the precursor cells are taken from early cells.

[0123] In the present disclosure, IEV is equivalent to IEVs. In the present disclosure, STS refers to staurosporine. In the present disclosure, exosomes refer to exosomes.

[0124] “Including” or “comprising” is intended to mean that the compositions (e.g. media) and methods include the recited elements, but not excluding others. When used to define compositions and methods, “consisting essentially of” means excluding other elements of any significance to the combination for the stated purpose. Thus, a composition substantially consisting of the elements defined herein does not exclude other materials or steps that do not substantially affect the basic and novel features of the claimed disclosure. “Consisting of” means excluding trace elements of other components and substantial method steps. Embodiments defined by each of these transition terms are within the scope of this disclosure.

[0125] An “effective amount” is an amount sufficient to achieve a beneficial or desired result, e.g., an enhanced immune response, treatment, prevention, or amelioration of a medical condition (disease, infection, etc.), and so on. An effective amount may be applied in one or more administrations, applications or dosages. The appropriate dosage will vary depending on the body weight, age, health, the disease or condition to be treated, and the way of administration.

[0126] As used herein, the terms “high expression” and the like are intended to include increased expression of nucleic acids or proteins to levels higher than those contained in prior art vesicles (e.g. exosomes).

[0127] As used herein, the term “pharmaceutically acceptable carrier” refers to any of standard pharmaceutical carriers, such as lyophilized powders, injections, tablets, capsules, kits, or patches. Typically such carriers contain excipients such as starch, milk, sugar, certain types of clays, gelatin, stearic acid or salts thereof, magnesium or calcium stearate, talc, vegetable fats or oils, gums, glycols, or other known excipients. Such carriers may also include flavoring and color additives, or other ingredients. Examples of pharmaceutically acceptable carriers include, but are not limited to, the following: water, saline, buffers, and inert non-toxic solids (e.g. mannitol and talc). Compositions including such carriers are formulated by well-known conventional methods. Depending on the intended mode of administration and intended use, the compositions may be in the form of solid, semi-solid or liquid dosage forms, such as powders, granules, crystals, liquids, suspensions, liposomes, pastes, creams, ointments, and the like, and may be in unit dosage forms suitable for administration of relatively precise dosages.

[0128] In the present disclosure, the components of the “composition” may be present in admixture or may be packaged separately. Separately packaged components may also contain their respective adjuvants. The adjuvant refers to a means used in pharmacy to aid the therapeutic efficacy of a drug. Where the components of the composition are packaged separately, the separately packaged components may be administered simultaneously or sequentially in any order where the patient is first treated with one drug and then administered with another drug. The patient refers to a mammalian subject, particularly a human subject.

[0129] In the present disclosure, the “composition” may also be present such that one component is encapsulated by another component. In some embodiments, in the composition, the induced vesicle serves as a drug carrier, and a drug for treating or preventing a disease is encapsulated in the induced vesicle.

[0130] In the present disclosure, the sources of corresponding reagents are as follows: Penicillin/Streptomycin Solution (BIOSOURCE; P303-100); Glutamine (BIOSOURCE; P300-100); Dexamethasone Sodium Phosphate (Sigma; D-8893); a-MEM (Gibco; 12571-063); 2-ME (GIBCO; 21985-023).

Example 1 Separated Culture of MSCs

[0131] In accordance with the guidance of the Animal Ethics Committee, mice were sacrificed with excess CO.sub.2. Under sterile conditions, the tibia and femur were removed, and the attached muscle and connective tissue were stripped out. Then the metaphysis was further separated to expose the bone marrow cavity. PBS containing 10% by volume of fetal bovine serum was drawn using a 10 mL sterile syringe to repeatedly flush the bone marrow cavity, and was filtered with a 70 .Math.m pore cell strainer, and centrifuged at 500 g for 5 min. After the supernatant was removed, the cell pellet at the bottom was collected, and then resuspend in PBS and centrifuged at 500 g for 5 min again to collect the final cell pellet. The cells were then subjected to flow cytometry sorting with CD34-and CD90+ as sorting criteria, such that BMMSCs were separated. Finally, the cells were resuspended in a Dex (-) culture solution, and inoculated to a 10 cm diameter cell culture dish and cultured at 37° C. in 5% CO.sub.2. After 24 h, non-adherent cells in the supernatant were removed by aspiration, washed with PBS, and added into the Dex (-) culture solution for further culture. After 1 week, an equal amount of Dex (+) culture solution was added, and after another week, dense primary BMMSCs colonies were observed. The BMMSCs were digested by trypsin incubation at 37° C., and passaged for amplification. Thereafter, the Dex (+) culture solution was changed every 3 days, and subcultured if confluent. The BMMSCs of second passage (P2) were taken for subsequent experiments.

[0132] The composition of the Dex (-) culture solution is shown in Table 1, and the composition of Dex (+) culture solution is shown in Table 2:

TABLE-US-00001 Formulation Table of Dex (-) Culture Solution reagents volume final concentration FBS 100 mL 20% penicillin/streptomycin solution (10,000 U/mL) 5 mL 100 U/mL glutamine (200 mM) 5 mL 2 mM 2-ME (55 mM) 500 .Math.L 55 .Math.M a-MEM add to 500 mL

TABLE-US-00002 Formulation Table of Dex (+) Culture Solution reagents volume final concentration FBS 100 mL 20% penicillin/streptomycin solution (10,000 U/mL) 5 mL 100 U/mL glutamine (200 mM) 5 mL 2 mM Dexamethasone Sodium Phosphate (10.sup.-4 M) 50 .Math.L 10.sup.-8 M 2-ME (55 mM) 500 .Math.L 55 .Math.M a-MEM add to 500 mL

[0133] by flow cytometry analysis of surface markers. For surface marker identification, P2 BMMSCs were harvested by trypsinization, and then washed once with PBS containing 3% FBS to be resuspended in the PBS at a density of 5×10.sup.5 /mL. Then, 1 .Math.L of PE fluorescent conjugated CD29, CD44, CD90, CD45, and CD34 antibodies were added, with the blank group left. Incubation was carried out for 30 min in the dark at 4° C., followed by washing with PBS for 2 times, and then tests were carried out on the instrument. The results of flow cytometry are shown in FIGS. 1A-1E. It can be seen that the separated cells are BMMSCs (bone marrow mesenchymal stem cells).

Example 2 Obtaining of Induced Vesicle

[0134] The MSCs cultured to the second passage in Example 1 (bone marrow-derived MSCs, BMMSCs) was further cultured with the medium (Dex (+) culture solution) in Example 1 until the cells were 80%-90% confluent, then washed twice with PBS, added with a serum-free medium (α-MEM medium) containing 500 nM STS to induce apoptosis, and incubated at 37° C. for 24 h, and the cell supernatant was collected for separation and extraction of IEVs.

[0135] The IEVs were separated and extracted from the collected cell supernatant. The operation process is shown in FIG. 2, specifically includes the steps of: performing centrifugation at 800 g for 10 min and collecting the supernatant; then performing centrifugation at 2000 g for 10 min and collecting the supernatant; then performing centrifugation at 16000 g for 30 min, removing the supernatant, and resuspending the IEVs in a sterile PBS; then performing centrifugation at 16000 g for 30 min, removing the supernatant, and resuspending the IEVs in 300-500 .Math.L of sterile PBS.

Comparative Example 1 Separation and Extraction of Exosomes From the Same MSCs Source

[0136] The MSCs cultured to the second passage in Example 1 (bone marrow-derived MSCs, BMMSCs) was further cultured with the medium in Example 1 until the cells were 80%-90% confluent, then washed twice with PBS, added with a serum-free medium, and incubated at 37° C. for 48 h, and the cell supernatant was collected for separation and extraction of exosomes.

[0137] The extraction steps include: centrifuging at 800 g for 10 min — collecting supernatant — centrifuging at 2000 g for 10 min — collecting supernatant — centrifuging at 16000 g for 30 min — collecting supernatant — centrifuging at 120000 g for 90 min — removing supernatant and resuspending pellet in sterile PBS — centrifuging again at 120000 g for 90 min, removing supernatant, collecting bottom exosomes, and resuspending in sterile PBS.

Example 3 Analysis of IEVs

1. Quantitative and Membrane Protein Analysis of IEVs

[0138] The quantitative analysis of IEVs obtained in Example 2 was performed using flow cytometry, and the time points for measurement were 1 h, 4 h, 8 h, 16 h and 24 h. The results showed that 10.sup.6 MSCs could produce 0.76×10.sup.8, 1.29×10.sup.8, 1.95×10.sup.8, 2.48×10.sup.8 and 3.14×10.sup.8 IEVs after induction to 1 h, 4 h, 8 h, 16 h and 24 h, respectively. It can be seen that a single MSC could produce 300 IEVs after induction to 24 h (FIG. 3).

[0139] In addition, the particle diameter distribution of IEVs found by flow cytometry was concentrated within less than 1 .Math.m, accounting for 94.97% (FIG. 4A). The results of side scatter (SSC) analysis also showed that the scattered light intensity of IEVs was concentrated in the range of less than 1 .Math.m (FIG. 4B). Further, the scattered light intensity of IEVs was analyzed by standardized small particle microspheres (0.2 .Math.m, 0.5 .Math.m, and 1 .Math.m) produced by Bangs Laboratories, and the results showed that the particle diameters of IEVs were all below 0.2 .Math.m (FIG. 4C). Transmission electron microscopy (TEM) showed similar results as flow cytometry, with most vesicles at and below 200 nm in diameter (FIG. 4D). Nanoparticle tracking analysis (NTA) was consistent with TEM observations, with IEVs particles averaging 169 nm in diameter (FIG. 4E). Particle size measurements at the single-vesicle level using a state-of-the-art nano-flow cytometry technology also showed that the average particle diameter of IEVs was at 100.63 nm (FIG. 4F).

[0140] The surface membrane proteins of the IEVs extracted in Example 2 were analyzed by flow cytometry, and the results showed that the IEVs derived from MSCs expressed surface proteins similar to MSCs, i.e., CD29, CD44, CD73, CD166 positive, and CD34, CD45 negative. At the same time, IEVs could express the ubiquitous surface proteins CD9, CD63, CD81 and C1q of extracellular vesicles (FIGS. 5A-5K).

2. Content Analysis for IEVs

[0141] Proteomic quantification of BMMSCs, MSCs-exosomes (extracted in Comparative Example 1), and MSCs-IEVs (obtained in Example 2) was performed using the protein DIA quantification technique. The results showed that the protein content expression of MSCs-exosomes and MSCs-IEVs had a high overlap with that of the parent cells, and 170 proteins were specifically highly expressed in IEVs (FIG. 6A).

[0142] Through bioinformatics analysis, IEVs-specific and highly expressed proteins were screened, and a heat map was drawn (FIG. 6B). By further combining with GO enrichment analysis results of differential proteins, it is confirmed that IEVs can specifically express Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 molecules at high levels. Compared with exosomes derived from the same MSCs, the expression levels of the 5 characteristic molecules of IEVs are all significantly up-regulated, specifically: the expression levels of the markers Annexin V, Flotillin-1, Cadherin 11, Integrin alpha 5, and Syntaxin 4 in IEVs are 1.76 fold, 2.81 fold, 2.41 fold, 3.68 fold and 4.45 fold, respectively, of that in exosomes (FIG. 6C). Finally, it was verified again with the Western Blot, and the results were consistent with the results of the DIA quantitative analysis (FIG. 6D).

[0143] MSCs-Exosomes: exosomes derived from BMMSCs.

[0144] MSCs-IEVs: IEVs derived from BMMSCs.

[0145] The MSCs in the content analysis and the MSCs for extraction of the exosomes and IEVs are from the same BMMSCs cell strain.

Example 4 Use of MSCs-Derived IEVs in Treating Mice With Bleeding Disorders, And Mechanistic Studies.

Use of IEVs in Treating Mice with Hemophilia

[0146] The in vitro procoagulant effects of the IEVs obtained in Example 2 and the exosomes extracted in Comparative Example 1 were examined using an in vitro clotting assay. The results, as shown in Table 3, showed that the IEVs shortened the in vitro coagulation time of most plasma, and the procoagulant effect was better than exosomes. However, for the plasma deficient in factors II, V, and X, the IEVs failed to exert the in vitro procoagulant effect, indicating that the in vitro procoagulant effect of IEVs was more concentrated at the upstream of the common coagulation pathway.

[0146] TABLE-US-00003 Clotting time (min) n = 5 Mice plasma Factor II deficient plasma Factor V deficient plasma Factor VII deficient plasma Factor VIII deficient plasma Factor IX deficient plasma Factor X deficient plasma Factor XI deficient plasma Factor XII deficient plasma PBS 20 >20 >20 >20 >20 >20 >20 >20 >20 IEVs 0.75 >20 >20 >17 2 4 >20 4 4 exosomes 1.5 >20 >20 >20 2.5 5 >20 4 4

[0147] Mice with hemophilia A (clotting factor VIII deficiency) were used as a model to observe the procoagulant effect of IEVs in vivo by tail vein injection of 9×10.sup.8 IEVs. As shown in FIG. 7, the treatment with IEVs significantly improved the bleeding tendency of mice with hemophilia, and the treatment effect was stably maintained for 14 days.

[0148] The results showed that IEVs could significantly promote coagulation in vitro. Besides, it can significantly improve the bleeding tendency after in vivo injection, and can be used to improve the bleeding tendency caused by hemophilia A.

[0149] The levels of various coagulation factors in the plasma of mice were also tested, and it was found that there were no significant changes in the coagulation factor VIII, vWF factor, tissue factor (TF) and prothrombin (FIG. 8A, FIG. 8B, FIG. 8C, and FIG. 8D).

[0150] In the hemophilia A mice model, normal IEVs, PS-negative IEVs and TF-negative IEVs were separately injected, with a tail-cutting test performed 7 days later. As shown in FIG. 9A and FIG. 9B, the blocking of PS and TF did not affect the in vivo therapeutic effect of IEVs, suggesting that the mechanism of IEVs in treating hemophilia mice is not related to PS and TF. Previous literature reported that the procoagulant effect of extracellular vesicles was highly dependent on PS and TF on their surface, while the results of IEVs in vivo were inconsistent with previous studies, suggesting that IEVs may have a new procoagulant mechanism in the in vivo environment.

Use of IEVs in Treating Mice with Lupus Bleeding

[0151] In clinical practice, patients with systemic lupus erythematosus (SLE) often have a bleeding tendency, the specific mechanism is unclear at present, and according the existing literature reports, it is mostly believed to be related to the factors such as thrombocytopenia associated with SLE. In the treatment measures, blood transfusion or platelet transfusion methods are often used, but the effect is not ideal.

[0152] According to the present invention, 1pr mice were injected with IEVs (extracted in Example 2), and subjected to tail-cutting experiments 7 days later. The results showed that, the treatment with IEVs significantly improved the bleeding tendency of 1pr mice, and the treatment effect was stably maintained for 7 days (FIG. 9C). The 1pr mice are a representative animal model of SLE.

[0153] The experimental results showed that IEVs could be used to improve the bleeding tendency of lupus erythematosus.

Use of IEVs in Treating Mice with Chédiak-Higashi Syndrome

[0154] Chediak-Higashi syndrome (CHS) is an autosomal recessive genetic disease, most of which is found in the offspring of consanguineous marriage. The pathogenic gene is the lysosomal trafficking regulator (LYST) gene. Mutations in the LYST gene often result in abnormal LYST protein production, which leads to platelet dysfunction. Patients may present with a significant bleeding tendency in clinical practice, and currently there is no effective preventive and therapeutic measures.

[0155] According to the present invention, the CHS mice were injected with IEVs (obtained in Example 2), and subjected to tail-cutting experiments 10 days later. The results showed that, the treatment with IEVs significantly improved the bleeding tendency of CHS mice, and the treatment effect was stably maintained for 10 days (FIG. 9D).

[0156] The results showed that IEVs could be used to improve the bleeding tendency of mice with Chediak-Higashi syndrome.

Comparative Example 2

[0157] In the hemophilia A mice model, the IEVs (obtained in Example 2) and exosomes (extracted in Comparative Example 1) derived from the same MSCs were separately used for injection treatments (9×10.sup.8), and the results showed that the IEVs could significantly correct the bleeding tendency of mice, while the exosomes had no significant treatment effect (FIG. 10).

[0158] The in vitro procoagulant effect of the IEVs obtained in Example 2 was compared with that of the exosomes prepared in Comparative Example 1:

[0159] the IEVs obtained in Example 2 had a diameter in the range of 0.03 .Math.m - 0.2 .Math.m and 0.2 .Math.m - 1 .Math.m, and expressed the markers Syntaxin 4, Annexin V, Flotillin-1, Cadherin 11 and Integrin alpha 5, with a strong in vitro procoagulant effect; the exosomes prepared in Comparative Example 1 had a diameter of 0.03 .Math.m - 0.15 .Math.m, and expressed the markers Complement C1q, Complement C3, Thrombospondin-1 and Thrombospondin-2, with a relatively weak in vitro procoagulant effect.

TABLE-US-00004 group IEVs obtained in Example 2 IEVs obtained in Example 2 exosomes prepared in Comparative Example 1 vesicle diameter 0.03 .Math.m - 0.2 .Math.m 0.2 .Math.m - 1 .Math.m 0.03 .Math.m - 0.15 .Math.m markers expressed by vesicle Syntaxin 4, Annexin V, Flotillin-1, Cadherin 11 and Integrin alpha 5 Syntaxin 4, Annexin V, Flotillin-1, Cadherin 11 and Integrin alpha 5 Complement C1q Complement C3 Thrombospondin-1 Thrombospondin-2 effects strong in vivo and in vitro procoagulant effect strong in vivo and in vitro procoagulant effect weak in vivo and in vitro procoagulant effect

Example 5

1. Culture of Induced Pluripotent Stem Cells (iPS Cells, iPSC)

[0160] (1) Lentivirus Preparation: [0161] 1 mL of DMEM was transferred to an EP tube, 5 .Math.g of gene expression plasmid and 5 .Math.g of g vsvg plasmid were added to 25 .Math.L of liposomes, and the system was gently stirred at room temperature for 20 minutes. The mixture was added dropwise to cultured GP2-293 cells (95% mixed well) and vortexed to evenly distribute the mixture. The medium (DMEM + 10% FBS + glutamine) was changed after 12 hours. After 24 hours of medium change, the medium containing the virus was collected, and after 48 hours the medium was collected again. [0162] (2) Induction of cellular reprogramming: [0163] Each well (12-well plate) was inoculated with 5×10.sup.5 GP2-293 cells cultured in step (1) at 80% confluence. 100 ng of virus was added to the culture medium (DMEM + 10% FBS (heat inactivated) + glutamine) of 500-1000 .Math.L/well, 4 .Math.g/mL polybrene was added, and a new culture medium was changed after incubation for 12 h. The steps were repeated. Within 7 days, 5×10.sup.4 induced cells were inoculated into 10 cm dishes with feeder cells (mEFs). The next day, the medium was changed to an ES medium with bFGF (4 ng/mL), and the medium was changed every other day. Five days later, the cells started to clone, and if there were no ES-like clones after 40 days, it was considered to be failed. [0164] (3) Cell passage: [0165] After 60% confluence, 0.5 mL of accutase was added to each dish and allowed to stand at room temperature for 1 minute. The separated cell aggregates were transferred to a 15 mL centrifuge tube, and an additional 2 mL mTeSR1 was used to collect any remaining aggregates. The rinse was added to the 15 mL tube. The 15 mL tube containing cell aggregates was centrifuged at 200 g for 5 minutes at room temperature. The supernatant was aspirated. The cells were resuspended while ensuring that the cells remain aggregated. Human iPS cells were assembled with mTeSR1 on new plates coated with Matrigel. The culture dish was placed in an incubator at 37° C., and quickly moved left and right to evenly distribute the movement of aggregates. Incubation was carried out at 37° C. with 5% carbon dioxide and 95% humidity. The fluid was changed every day.

2. Culture of MC3T3-E Subclone 14 Osteoblast Line

[0166] Purchased MC3T3-E1 Subclone 14 was thawed rapidly and centrifuged at 500 g for 5 min. The cell pellet at the bottom was collected after removing the supernatant. The cells were resuspended in a Dex (-) culture solution and inoculate on a 10 cm diameter cell culture dish at 37° C. in 5% CO.sub.2. After full growth, trypsin was used for incubation and digestion at 37° C. for subculture and amplification, and then the Dex (-) culture medium was changed every 3 days. The cells could be used for multiple passages. The composition of the Dex (-) culture solution is shown in Table 5:

[0166] TABLE-US-00005 Formunation Table of Dex (-) Culture Solution reagents volume final concentration FBS 100 mL 20% penicillin/streptomycin solution (10,000 U/mL) 5 mL 100 U/mL glutamine (200 mM) 5 mL 2 mM 2-ME (55 mM) 500 .Math.L 55 .Math.M α-MEM add to 500 mL

3. Analysis of IEVs

[0167] IEVs derived from osteoblast MC3T3-E1, iPS cells and human bone marrow mesenchymal stem cells (hBMMSCs) were compared. The three cell-derived IEVs were obtained as described in Example 2.

Morphological Detection

[0168] As shown in FIG. 11, iPS cells (iPSCs) and osteoblast MC3T3-E1-derived IEVs, and human BMMSCs-derived IEVs were observed to be similar and irregular in morphology under a light microscope at 400X.

Particle Diameter Detection of IEVs

[0169] Flow cytometry was performed, and the results were as shown in FIG. 12. The results of flow cytometry showed that the osteoblast line MC3T3-E1 and human bone marrow mesenchymal stem cells hBMMSCs-derived IEVs had the similar particle diameter distribution.

Surface Marker Detection of IEVs

[0170] As shown in FIG. 13, with detection by the Western Blot method, the results showed that both the iPS cells (iPSCs) and human bone marrow mesenchymal stem cells hBMMSCs-derived IEVs showed high expression of the marker Anenexin V of IEVs. iPS cells-derived IEVs express Syntaxin 4 at a higher level than hBMMSCs.

Example 6 Excretion of IEVs Through the Skin and Hair

[0171] 4×10.sup.6 IEVs prepared in Example 2 was labeled with DIR, and resuspended in 200 .Math.L of PBS, and then systemically injected into nude mice BALB/c-nu/nu through the tail veins. The distribution of IEVs on the skin surface was observed after 1, 3 and 7 days using a living body imaging instrument, and the results were as shown in FIGS. 13A-13C.

[0172] FIG. 13A showed that IEVs can reach the skin surface with the largest amount on Day 3, and substantially disappear on Day 7, indicating a dynamic metabolic process of IEVs on the skin surface (FIG. 13A). Immunofluorescence results showed that after systemic injection of C57 mice with PKH26-IEV, it gradually moved from the subcutaneous tissue to the dermis and epidermis over time. Large amounts of IEVs were observed on the stratum corneum at the skin surface on Day 7, suggesting that the systemically injected IEVs could be excreted as the stratum corneum sloughs off (FIG. 13B). Meanwhile, the presence of PKH26-IEV in hair follicles was found in hairs extracted from the surface of mice on day 7, indicating that the systemically injected IEVs were also metabolized as hairs fell off (FIG. 13C). This example demonstrates that IEVs can be excreted through the skin and hair, demonstrating the safety of injecting or increasing the level IEVs in the body.

Example 7

[0173] The culture of hiPSCs is the same as that in Example 5, and hUCMSCs is also a conventional culture method in the art.

[0174] The hiPSCs can be of the 26.sup.th-29.sup.th passage, but is not limited thereto, and the 26.sup.th passage is specifically used in this example; the hUCMSCs may be of the 7.sup.th-9.sup.th passage, but is not limited thereto, and the 7.sup.th passage is the specific used in this example.

[0175] 1. Experiment method [0176] (1) hiPSCs and hUCMSCs were induced to apoptosis for about 9 h using staurosporine (500 nM) (the other steps were the same as in Example 2), and stained with Annexin V (15 min) and 7AAD (3 min), and the rate of apoptosis was detected by flow cytometry. [0177] (2) The IEVs from the supernatant of the apoptotic cells of step (1) were separated, and the expression rate of Annexin V was detected by flow cytometry. The IEVs were extracted by differential centrifugation, including the following steps: centrifugation at 800 g for 10 min — centrifugation at 2000 g for 5 min (other extraction steps are the same as in Example 2 except for this step) — centrifugation at 16000 g for 30 min — centrifugation at 16000 g for 30 min, to obtain IEVs. [0178] Staining with Annexin V for 15 mins, and then performing the flow cytometry. [0179] 2. Experiment results [0180] (1) We photographed the death process of hiPSCs and hUCMSCs with high content, and found that the two were have different death processes. hiPSCs contracted with multiple centers of the nucleus and cytoplasm, and then sent out dendritic branches with blebbing; while hUCMSCs contracted with a single center of the nucleus, accompanied by branching and blebbing. The results were as shown in FIG. 14. [0181] (2) the apoptosis rates of hiPSCs and hUCMSCs induced to apoptosis were analyzed by flow cytometry, and it was demonstrated that most cells underwent apoptosis. The results were as shown in FIG. 15. [0182] (3) The positive rate of Annexin 5 expression by flow cytometry was over 80% for both hiPSCs and hUCMSCs. The results were as shown in FIG. 16. [0183] (4) The two types of IEVs were characterized using Nanoparticle Tracking Analysis (NTA): [0184] 1) As shown in FIG. 17, the particle size of IEVs derived from hiPSCs was about 100 nm, and the particle size of IEVs derived from hUCMSCs was about 180 nm; [0185] 2) As shown in FIG. 18, the yield of IEVs from hiPSCs was 21971 particles/hiPSCs, and the yield of hUCMSCs was 886 particles/hUCMSCs; [0186] 3) As shown in FIG. 19, the potential of IEVs derived from hiPSCs was about -12 mV, and the potential of IEVs derived from hUCMSCs was about -45 mV.