Method for isolation and purification of microvesicles from cell culture supernatants and biological fluids
First Claim
1. A method of treating a skin wound in a patient in need thereof, the method comprising:
- administering a pharmaceutical composition of isolated microvesicles to the skin wound of the patient,wherein the pharmaceutical composition of isolated microvesicles is prepared comprising the steps of;
(a) obtaining a biological fluid containing mammalian microvesicles from a mesenchymal stem cell;
(b) precipitating the microvesicles by adding polyethylene glycol (PEG) to the biological fluid;
(c) washing the precipitated microvesicles to remove the PEG;
(d) isolating the microvesicles to obtain isolated microvesicles; and
(e) providing a therapeutically effective amount of the precipitated isolated macrovesicles as a pharmaceutical composition,wherein the precipitated microvesicles range in size from 2 nm to 5000 nm,wherein the isolated microvesicles result in increased migration of non-proliferating cultured fibroblasts in a cell migration assay when administered to the non-proliferating cultured fibroblasts, andwherein administering the pharmaceutical composition of isolated microvesicles to the skin wound of the patient results in regeneration of at least one skin tissue in the skin wound.
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Abstract
The present invention relates to the fields of medicine, cell biology, molecular biology and genetics. In particular, the present invention provides methods to isolate and purify microvesicles from cell culture supernatants and biological fluids. The present invention also provides pharmaceutical compositions of microvesicles to promote or enhance wound healing, stimulate tissue regeneration, remodel scarred tissue, modulate immune reactions, alter neoplastic cell growth and/or mobility, or alter normal cell growth and/or mobility. The present invention also provides compositions of microvesicles to be used as diagnostic reagents, and methods to prepare the compositions of microvesicles.
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Citations
36 Claims
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1. A method of treating a skin wound in a patient in need thereof, the method comprising:
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administering a pharmaceutical composition of isolated microvesicles to the skin wound of the patient, wherein the pharmaceutical composition of isolated microvesicles is prepared comprising the steps of; (a) obtaining a biological fluid containing mammalian microvesicles from a mesenchymal stem cell; (b) precipitating the microvesicles by adding polyethylene glycol (PEG) to the biological fluid; (c) washing the precipitated microvesicles to remove the PEG; (d) isolating the microvesicles to obtain isolated microvesicles; and (e) providing a therapeutically effective amount of the precipitated isolated macrovesicles as a pharmaceutical composition, wherein the precipitated microvesicles range in size from 2 nm to 5000 nm, wherein the isolated microvesicles result in increased migration of non-proliferating cultured fibroblasts in a cell migration assay when administered to the non-proliferating cultured fibroblasts, and wherein administering the pharmaceutical composition of isolated microvesicles to the skin wound of the patient results in regeneration of at least one skin tissue in the skin wound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of treating a burn wound in a patient in need thereof, the method comprising administering a pharmaceutical composition of isolated microvesicles to the burn wound of the patient,
wherein the isolated microvesicles are prepared comprising the steps of: -
(a) obtaining a biological fluid containing mammalian microvesicles from a mesenchymal stem cell; (b) precipitating the microvesicles by adding polyethylene glycol (PEG) to the biological fluid; (c) washing the precipitated microvesicles to remove the PEG, (d) isolating the microvesicles to obtain isolated microvesicles; and (e) providing a therapeutically effective amount of the precipitated isolated microvesicles as a pharmaceutical composition, wherein the precipitated microvesicles range in size from 2 nm to 5000 nm, wherein the isolated microvesicles result in increased migration of non-proliferating cultured fibroblasts in a cell migration assay when administered to the non-proliferating cultured fibroblasts, and wherein administering the pharmaceutical composition of isolated microvesicles to the burn wound of the patient results in in regeneration of at least one skin tissue in the burn wound. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of treating a burn wound in a patient in need thereof, the method comprising
administering a pharmaceutical composition of isolated microvesicles directly to the burn wound of the patient, wherein the isolated microvesicles are prepared comprising the steps of: -
(a) obtaining culture medium conditioned using human bone marrow-derived mesenchymal stem cells, the culture medium containing microvesicles; (b) precipitating the microvesicles by adding polyethylene glycol (PEG) to the biological fluid; (c) washing the precipitated microvesicles to remove the PEG; (d) isolating the microvesicles to obtain isolated microvesicles; and (e) providing a therapeutically effective amount of the isolated microvesicles as a pharmaceutical composition, wherein the precipitated microvesicles range in size from 2 nm to 5000 nm, wherein the isolated microvesicles result in increased migration of non-proliferating cultured fibroblasts in a cell migration assay when administered to the non-proliferating cultured fibroblasts, and wherein administering the pharmaceutical composition of isolated microvesicles to the burn wound of the patient results in in regeneration of at least one skin tissue in the burn wound of the patient. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification