KR20230008250A - Mesenchymal stem cells and uses therefor - Google Patents

Abstract

Administration of mesenchymal stem cells in an effective amount to an animal to treat autoimmune disease, allergic reaction, cancer, or inflammatory disease in the animal, promote wound healing, repair epithelial damage, and form angiogenesis in organs and tissues of the animal. how to promote it.

Description

Mesenchymal stem cells and their uses {MESENCHYMAL STEM CELLS AND USES THEREFOR}

This invention was made with Government support under Contract No. N66001-02-C-8068 awarded by the Department of the Admiralty. The government has certain rights in this invention.

This application claims priority from Provisional Application Serial No. 60/555,118, filed on March 22, 2004 (the contents of which are incorporated herein by reference in their entirety), filed on March 15, 2005. 11/080,298 is a partial continuation application.

The present invention relates to mesenchymal stem cells. More particularly, the present invention promotes angiogenesis in various tissues and organs, treats autoimmune diseases, treats allergic reactions, treats cancer, treats inflammatory diseases and disorders, promotes wound healing, and promotes inflammation. It relates to novel uses for mesenchymal stem cells, including treating epithelial damage and repairing epithelial damage.

Mesenchymal stem cells (MSCs) are pluripotent stem cells that can readily differentiate into lineages including osteoblasts, myocytes, chondrocytes, and adipocytes (Pittenger, et al., Science . Vol. 284, pg.143 (1999)] [Haynesworth, et al., Bone.Vol.13 , pg.69 (1992)] [Prockop, Science.Vol.276, pg.71 (1997)])). In vitro studies have shown that MSCs are found in muscle (Wakitani, et al., Muscle Nerve . Vol. 18, pg. 1417 (1995)), neuron-like precursors (Woodbury, et al., J. Neurosci.Res.Vol.69 , pg.908 (2002)] [Sanchez-Ramos, et al., Exp. Neurol ., Vol. Toma, et al., Circulation.Vol.105 , pg.93 (2002)]; ability has been demonstrated. Additionally, MSCs have been shown to provide an effective feeder cell layer for hematopoietic and embryonic stem cell expansion (Eaves, et al., Ann. NY Acad. Sci . Vol. 938, pg. 63 (2001)); [Wagers, et al., Gene Therapy . Vol. 9, pg. 606 (2002)])). Recent studies using various animal models suggest that MSCs may be useful for repair or regeneration of damaged bone, cartilage, meniscus or myocardial tissue (DeKok, et al., Clin. Oral Implants Res . Vol. 14, pg. 481 (2003) [Wu, et al., Transplantation , Vol. 75, pg. 679 (2003)] [Noel, et al., Curr. pg.1000 (2002)] [Ballas, et al., J. Cell. Biochem. Suppl. , Vol. 38, pg. 27 (2002)])). Several researchers have used MSCs to treat osteoporosis (Pereira, et al., Proc. Nat. Acad. Sci . Vol. 95, pg. 1142 (1998)), parkinsonism (Schwartz, et al. , Hum. Gene Ther . Vol. 10, pg. 2539 (1999)), spinal cord injury (Chopp, et al., Neuroreport , Vol. 11, pg. 3001 (2000); Wu, et al. ., J. Neurosci. Res . Vol. 72, pg. 393 (2003)) and heart disorders (Tomita, et al., Circulation . Vol. 100, pg. 247 (1999)]; [Shake , et al., Ann. Thorac . Surg., Vol. 73, pg. 1919 (2002)] have yielded promising transplant results in animal disease models. Importantly, osteogenesis imperfecta (Horwitz, et al. al., Blood . Vol. 97, pg. 1227 (2001)]; (Frassoni, et al., Int. Society for Cell Therapy . SA006 (abstract) (2002); Koc, et al., J. Clin. Oncol . Vol. 18, pg. 307 (2000)) ), expected results from clinical trials have also been reported.

MSCs express major histocompatibility complex (MHC) type I antigens on their surface, but MHC type II antigens (Le Blanc, et al., Exp. Hematol Vol. 31, pg. 890 (2003)); [Potian, et al., J. Immunol . Vol. 171, pg. 3426 (2003)]) and certain B7 or CD40 co-stimulatory molecules (Majumdar, et al., J. Biomed. Sci . Vol. 10 , pg. 228 (2003)]), suggesting that these cells have a low immunogenic phenotype (Tse, et al., Transplantation . Vol. 75, pg. 389 (2003) ]) MSCs also inhibit the T-cell proliferative response in an MHC-independent manner (Bartholomew, et al., Exp. Hematol. Vol. 30, pg. 42 (2002); Devine, et al. al., Cancer J. Vol. 7, pg. 576 (2001)] [DiNicola, et al., Blood . Vol. 99, pg. 3838 (2002)])). can enhance implantation and limit the ability of the recipient's immune system to recognize and reject allogeneic cells after transplantation.With the ability of MSCs to differentiate into appropriate cell types under local stimulation, MSCs are By producing factors that modulate the immune response and support hematopoiesis, they may be desirable stem cells for cell transplantation studies (Majumdar, et al., Hematother. Stem Cell Res.. Vol. 9, pg. 841 ( 2000)]; [Haynesworth, et al., J. Cell. Physiol . Vol. 166, pg. 585 (1996)])).

Accordingly, Applicants studied the interaction of mesenchymal stem cells with isolated immune cell populations including dendritic cells (DC1 and DC2), effector T-cells (Th1 and Th2) and NK cells. Based on such interactions, Applicants have discovered that mesenchymal stem cells are capable of regulating the production of various factors that can modulate several steps in the course of an immune response. Thus, mesenchymal stem cells can be used to treat diseases, conditions, and disorders involving the immune system, or diseases, conditions, and disorders involving inflammation, epithelial damage, or allergic reactions. Such diseases, conditions, and disorders include autoimmune diseases, allergies, arthritis, inflammatory wounds, alopecia areata (baldness), periodontal diseases including gingivitis and periodontitis, and other diseases, conditions, and disorders involving an immune response; It is not limited to this.

Additionally, it is believed that mesenchymal stem cells express and secrete vascular endothelial growth factor (or VEGF), which promotes angiogenesis by stimulating the formation of new blood vessels. Mesenchymal stem cells also stimulate peripheral blood mononuclear cells (PBMCs) to produce VEGF.

Additionally, mesenchymal stem cells are believed to stimulate dendritic cells (DCs) to produce interferon-beta (IFN-β), which promotes tumor suppression and immunity to viral infection.

According to one aspect of the present invention there is provided a method of treating a disease selected from the group consisting of autoimmune disease and graft versus host disease in an animal. The method comprises administering mesenchymal stem cells to an animal in an amount effective to treat the disease in the animal.

Although the scope of this aspect of the invention is not limited to any theoretical argument, at least one mechanism by which mesenchymal stem cells suppress autoimmune diseases and graft-versus-host disease is regulatory T-cells (T _reg cells) and/or or by releasing interleukin-10 (IL-10) from dendritic cells (DC).

Autoimmune diseases that can be treated according to the present invention include type I diabetes, rheumatoid arthritis, uveitis, autoimmune thyroid disease, inflammatory bowel disease, scleroderma, Graves' disease, lupus, Crohn's disease, autoimmune lymphoproliferative disease (ALPS) ), demyelinating disease, autoimmune encephalomyelitis, autoimmune gastritis (AIG), and autoimmune glomerular disease. Also, as mentioned above, graft versus host disease can be treated. However, it should be understood that the scope of the present invention is not intended to be limited to the treatment of the specific diseases mentioned herein.

In one embodiment, the animal to which mesenchymal stem cells are administered is a mammal. Mammals can be primates, including humans and non-human primates.

In general, mesenchymal stem cell (MSC) therapy is based, for example, on the following sequence: harvesting MSC-containing tissue, isolating and expanding MSCs, and injecting MSCs into animals with or without biochemical or genetic manipulation. administration.

The mesenchymal stem cells administered may be a homogeneous composition or may be a mixed cell population enriched with MSCs. Homogeneous mesenchymal stem cell compositions can be obtained by culturing adherent bone marrow or periosteal cells, and mesenchymal stem cells can be identified by specific cell surface markers identified with unique monoclonal antibodies. Methods for obtaining cell populations enriched for mesenchymal stem cells are described, for example, in U.S. Patent No. 5,486,359. Alternative sources for mesenchymal stem cells include, but are not limited to, blood, skin, umbilical cord blood, muscle, fat, bone, and perichondrium.

Mesenchymal stem cells can be administered by various methods. Mesenchymal stem cells can be administered systemically, such as, for example, intravenous, intraarterial, or intraperitoneal administration.

Mesenchymal stem cells can be derived from a variety of sources, including autologous, allogeneic, or xenogeneic.

Mesenchymal stem cells are administered in an amount effective to treat an autoimmune disease or graft versus host disease in an animal. Mesenchymal stem cells may be administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The dosage of mesenchymal stem cells depends on a variety of factors, including the age, weight, and sex of the patient, the autoimmune disease being treated, and the extent and severity thereof.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier. For example, mesenchymal stem cells can be administered as a suspension of cells in a pharmaceutically acceptable liquid medium or gel for injection or topical use.

According to another aspect of the invention, a method of treating an inflammatory response in an animal is provided. The method comprises administering mesenchymal stem cells to an animal in an amount effective to treat an inflammatory response in the animal.

Although the scope of this aspect of the invention is not limited to any theoretical argument, it is believed that mesenchymal stem cells regulate the inflammatory response by promoting the maturation of T-cells into regulatory T-cells (T _reg ). It is also believed that mesenchymal stem cells reduce the expression of interferon-γ (IFN-γ) in certain inflammatory responses, such as those associated with psoriasis, for example, by inhibiting type 1 helper T cells (Th1 cells).

In one embodiment, the inflammatory response that can be treated is related to psoriasis.

In another embodiment, the mesenchymal stem cells are reduced by contacting the mesenchymal stem cells with microglia and/or astrocytes in the brain to reduce inflammation, thereby reducing the mesenchymal stem cells, eg, in Alzheimer's disease, Parkinson's disease. It can be administered to animals to limit neurodegeneration caused by activated glial cells in diseases or disorders such as illness, stroke, or brain cell damage.

In yet another embodiment, mesenchymal stem cells are provided such that the mesenchymal stem cells can contact keratinocytes and Langerhans cells in the skin epidermis to reduce inflammation, such as may occur in psoriasis, chronic dermatitis, and contact dermatitis. Can be administered to animals. Although this embodiment is not limited to any theoretical argument, mesenchymal stem cells can contact keratinocytes and Langerhans cells in the epidermis and alter the expression of T-cell receptors and cytokine secretion profiles; Through this, it is believed that the expression of tumor necrosis factor-alpha (TNF-α) can be increased and the regulatory T-cell (T _reg cell) population can be increased.

In a further embodiment, such as occurs in arthritis and arthritis-like conditions, including but not limited to osteoarthritis and rheumatoid arthritis, and other arthritic conditions listed on the website www.arthritis.org/conditions/diseases . , mesenchymal stem cells can be used to reduce intraosseous inflammation. Although the scope of this embodiment is not limited to any theoretical argument, it is believed that mesenchymal stem cells are capable of inhibiting interleukin-17 secretion by memory T-cells in synovial fluid.

In another embodiment, mesenchymal stem cells can be used to limit inflammation in the intestine and liver, respectively, in inflammatory bowel disease and chronic hepatitis. Although not intending to limit this aspect of the invention to any theoretical argument, it is believed that mesenchymal stem cells promote increased secretion of interleukin-10 (IL-10) and production of regulatory T-cells (T _reg cells).

In another embodiment, mesenchymal stem cells can be used to inhibit excessive activation of neutrophils and macrophages in pathological conditions such as sepsis and trauma, including, for example, burns, surgery, and transplantation. Although the scope of this embodiment is not limited by any theoretical argument, it is believed that mesenchymal stem cells promote secretion of inhibitory cytokines, such as IL-10, and inhibit macrophage migration inhibitors. .

In another embodiment, mesenchymal stem cells are associated with the eye, brain, spinal cord, uterus and placenta of pregnant women, ovaries, testes, adrenal cortex, liver, and hair follicles, including, for example, the cornea, lens, pigment epithelium, and retina. It can be used to suppress inflammation at sites of immune privilege, such as Although the scope of this embodiment is not limited by any theoretical argument, it is believed that mesenchymal stem cells promote the secretion of inhibitory cytokines, such as IL-10 and the production of T _reg cells, for example.

In yet another embodiment, mesenchymal stem cells may be used to treat tissue damage associated with End Stage Renal Disease (ESRD) infection during dialysis and/or glomerulonephritis. Although the scope of this embodiment is not limited to any theoretical argument, it is believed that mesenchymal stem cells can promote renal repair. Mesenchymal stem cells also express and secrete vascular endothelial growth factor (or VEGF), which stimulates new blood vessel formation, which should help repair damaged renal tissue.

In a further embodiment, mesenchymal stem cells can be used to inhibit viral infections, such as, for example, influenza, hepatitis C, herpes simplex virus, vaccinia virus infection, and Epstein-Barr virus. Although the scope of this embodiment is not limited to any theoretical argument, it is believed that mesenchymal stem cells promote the secretion of interferon-beta (IFN-β).

In yet another embodiment, mesenchymal stem cells can be used to inhibit parasitic infections, such as, for example, Leishmania infections and Helicobacter infections. Although the scope of this embodiment is not limited to any theoretical argument, mesenchymal stem cells mediate the response by type 2 T helper (Th2) cells and thereby immunoglobulin E (IgE) by β-cells. It is believed to promote an increase in the production of

However, it should be understood that the scope of this aspect of the invention is not limited to treating any particular inflammatory response.

Mesenchymal stem cells can be administered to mammals, including humans and non-human primates, as described herein above.

Mesenchymal stem cells may also be administered systemically, as described herein above. Alternatively, in the case of osteoarthritis or rheumatoid arthritis, mesenchymal stem cells can be administered directly to the arthritic joint.

Mesenchymal stem cells are administered in an amount effective to treat an inflammatory response in an animal. Mesenchymal stem cells may be administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The exact dosage of mesenchymal stem cells depends on a variety of factors, including the age, weight, and sex of the patient, the inflammatory response being treated, and the extent and severity thereof.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier, as described herein above.

According to another aspect of the invention, a method for treating inflammation and/or repairing epithelial damage in an animal is provided. The method comprises administering mesenchymal stem cells to an animal in an amount effective to treat inflammation and/or epithelial damage in the animal.

Although the scope of this aspect of the present invention is not limited to any theoretical argument, mesenchymal stem cells reduce secretion of the pro-inflammatory cytokines TNF-α and interferon-γ by T-cells, and It is believed to increase the secretion of the anti-inflammatory cytokines interleukin-10 (IL-10) and interleukin-4 (IL-4). It is also believed that mesenchymal stem cells reduce the secretion of interferon-γ by natural killer (NK) cells.

Inflammatory and/or epithelial injuries that may be treated according to aspects of the present invention include autoimmune diseases, transplant rejection, burns, cuts, lacerations, and ulcerations, including skin ulcers and diabetic ulcers, but Inflammation and/or epithelial damage caused by various diseases and disorders without limitation.

In one embodiment, mesenchymal stem cells are used to treat rheumatoid arthritis, Crohn's disease, type 1 diabetes, multiple sclerosis, scleroderma, Graves' disease, lupus, inflammatory bowel disease, autoimmune gastritis (AIG), and autoimmune glomerular disease. administered to animals to repair epithelial damage resulting from autoimmune diseases, including but not limited to. Mesenchymal stem cells also repair epithelial damage resulting from graft-versus-host disease (GVHD).

This aspect of the invention is particularly applicable to repairing epithelial damage resulting from graft-versus-host disease, and more particularly severe grafts, including Grade III to IV graft-versus-host disease, which adversely affect the skin and/or gastrointestinal system. It is applicable to repair epithelial damage resulting from host disease. Applicants have found that when mesenchymal stem cells are administered to patients suffering from severe graft-versus-host disease, and in particular Grades III to IV gastrointestinal graft-versus-host disease, administration of mesenchymal stem cells is effective in reducing the skin and/or ulceration of the patient. It was found that the tissue of the intestinal epithelium was restored.

In another embodiment, mesenchymal stem cells are administered to animals with transplanted organs or tissues, including but not limited to kidney, heart, and lung, to repair epithelial damage caused by rejection of the transplanted organ or tissue. is administered

In yet another embodiment, mesenchymal stem cells are used in animals to repair epithelial damage caused by burns, wounds, lacerations, and ulcerations, including but not limited to skin ulcerations and diabetic ulcerations. is administered

Mesenchymal stem cells can be administered to mammals, including humans and non-human primates, as described herein above.

Mesenchymal stem cells may also be administered systemically, as described herein above.

Mesenchymal stem cells are administered in an amount effective to repair epithelial damage in an animal. Mesenchymal stem cells may be administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The precise dosage of mesenchymal stem cells depends on a variety of factors including the age, weight, and sex of the patient, the type of epithelial damage being treated, and the extent and severity thereof.

According to yet another aspect of the present invention, a method of treating cancer in an animal is provided. The method comprises administering mesenchymal stem cells to an animal in an amount effective to treat cancer in the animal.

Although the scope of this aspect of the invention is not limited to any theoretical argument, it is believed that mesenchymal stem cells interact with dendritic cells to allow the secretion of IFN-β, which in turn acts as a tumor suppressor there is. Cancers that can be treated include, but are not limited to, hepatocellular carcinoma, cervical cancer, pancreatic cancer, prostate cancer, fibrosarcoma, medulloblastoma, and astrocytoma. However, it should be understood that the scope of this aspect of the invention is not limited to any particular cancer.

Animals can be mammals, including humans and non-human primates, as described herein above.

Mesenchymal stem cells are administered to an animal in an amount effective to treat cancer in the animal. Typically, mesenchymal stem cells are administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The precise dosage of mesenchymal stem cells depends on a variety of factors, including the age, weight, and sex of the patient, the cancer disease being treated, and the extent and severity thereof.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier and administered systemically, as described herein above. Alternatively, mesenchymal stem cells can be administered directly to the cancer to be treated.

According to yet another aspect according to the present invention, a method of treating an allergic disease or disorder in an animal is provided. The method comprises administering to an animal mesenchymal mesenchymal stem cells in an amount effective to treat a disease or disorder in the animal.

Although the scope of this aspect of the invention is not limited to any theoretical argument, it is believed that mesenchymal stem cells inhibit mast cell activation and degranulation when administered following an acute allergic response. In addition, mesenchymal stem cells downregulate basophil activation, cytokines such as TNF-α, chemokines such as interleukin-8 and monocyte chemoattractant proteins, or MCP-1, lipid mediating factors It inhibits, for example, leukotrienes, and is believed to inhibit key mediators, such as histamine, heparin, chondroitin sulfate, and cathepsins.

Allergic diseases or disorders that can be treated include, but are not limited to, asthma, allergic rhinitis, atopic dermatitis, and contact dermatitis. However, it should be understood that the scope of this invention is not intended to be limited to any particular allergic disease or disorder.

Mesenchymal stem cells are administered to an animal in an amount effective to treat an allergic disease or disorder in the animal. An animal may be a mammal. Mammals can be primates, including humans and non-human primates. Typically, mesenchymal stem cells are administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The precise dosage depends on a variety of factors including the age, weight, and sex of the patient, the allergic disease or disorder being treated, and the extent and severity thereof.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier, as described herein above. Mesenchymal stem cells can be administered systemically, eg intravenously or intraarterially.

According to a further aspect of the present invention, a method of promoting wound healing in an animal is provided. The method comprises administering mesenchymal stem cells to an animal in an amount effective to promote wound healing in the animal.

Although the scope of this aspect of the present invention is not limited to any theoretical argument, as mentioned above mesenchymal stem cells are believed to cause T _reg cells and dendritic cells to release interleukin-10 (IL-10). It is considered IL-10 promotes wound healing by limiting or inhibiting inflammation within the wound.

Additionally, mesenchymal stem cells can promote wound healing and fracture healing by inducing secreted factors by other cell types. For example, mesenchymal stem cells produce growth hormone, insulin, insulin-like growth factor 1 (IGF), as well as prostaglandin E2 (PGE2)-mediated release of vascular endothelial growth factor (VEGF) by peripheral blood mononuclear cells (PBMCs). -1), insulin-like growth factor binding protein-3 (IGFBP-3), and endothelin-1.

Wounds that can be healed include, but are not limited to, those resulting from cuts, lacerations, burns, and skin ulcerations.

Mesenchymal stem cells are administered to an animal in an amount effective to promote wound healing in the animal. An animal can be a mammal, and a mammal can be a primate, including humans and non-human primates. Typically, mesenchymal stem cells are administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The precise dosage of mesenchymal stem cells depends on a variety of factors, including the age, weight, and sex of the patient, and the extent and severity of the wound being treated.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier, as described herein above. Mesenchymal stem cells can be administered systemically, as described herein above. Alternatively, the mesenchymal stem cells can be administered directly to the wound, for example as a liquid on a dressing or reservoir containing the mesenchymal stem cells.

According to yet another aspect of the present invention, a method for treating or preventing fibrosis in an animal is provided. The method comprises administering mesenchymal stem cells to an animal in an amount effective to treat or prevent fibrosis in the animal.

Mesenchymal stem cells include, but are not limited to, liver cirrhosis, renal fibrosis associated with end-stage renal disease, and pulmonary fibrosis (including but not limited to acute respiratory disease syndrome (ARDS) and chronic obstructive pulmonary disease (COPD)). It can be administered to an animal to treat or prevent any type of fibrosis in an animal. It should be understood that the scope of the present invention is not limited to any particular type of fibrosis.

Mesenchymal stem cells are administered to an animal in an amount effective to treat or prevent fibrosis in the animal. An animal can be a mammal, and a mammal can be a primate, including humans and non-human primates. Typically, mesenchymal stem cells are administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The precise dosage of mesenchymal stem cells depends on a variety of factors, including the age, weight, and sex of the patient, and the extent and severity of the fibrosis being treated or prevented.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier, as described herein above. Mesenchymal stem cells may also be administered systemically, as described herein above.

Another object of the present invention is to promote angiogenesis in a tissue or organ of an animal in need of angiogenesis.

Accordingly, according to a further aspect of the present invention there is provided a method of promoting angiogenesis in a tissue or organ of an animal. The method comprises administering mesenchymal stem cells to an animal in an amount effective to promote angiogenesis in a tissue or organ of the animal.

Angiogenesis is the formation of new blood vessels from pre-existing microvascular beds.

Induction of angiogenesis can be used to treat coronary and peripheral arterial insufficiency, and thus can be a non-invasive therapeutic approach to treating coronary artery disease, ischemic heart disease, and peripheral artery disease. Angiogenesis can play an important role in the development and/or maintenance of organs other than the heart, as well as in the treatment of diseases and disorders of tissues and organs other than the heart. Angiogenesis can play an important role in the treatment of internal and external wounds, as well as skin ulcers. Angiogenesis may also play an important role in embryo implantation, and placental growth, as well as development of the embryonic vasculature. Angiogenesis is also essential for coupling cartilage resorption and bone formation, and is essential for correct growth plate morphogenesis.

Additionally, angiogenesis is necessary to successfully engineer and maintain highly metabolic organs, such as the liver, which require a dense vascular network to transport sufficient nutrients and gases.

Mesenchymal stem cells can be administered to tissues or organs requiring angiogenesis by various methods. Mesenchymal stem cells can be administered systemically, eg, by intravenous, intraarterial, or intraperitoneal administration, or mesenchymal stem cells can be administered by direct injection, eg, into a tissue or organ in need of angiogenesis. Likewise, it can be administered directly to a tissue or organ in need of angiogenesis.

Mesenchymal stem cells can be derived from a variety of sources, including autologous, allogeneic, or xenogeneic.

Although the scope of the present invention is not limited to any theoretical argument, when administered to an animal, mesenchymal stem cells can induce peripheral blood mononuclear cells (PBMCs) to produce vascular endothelial growth factor (or VEGF) that stimulates new blood vessel formation. ) is believed to stimulate

In one embodiment, the animal is a mammal. Mammals can be primates, including humans and non-human primates.

Mesenchymal stem cells according to the present invention can be used for the treatment, alleviation, or prevention of any disease or disorder that can be alleviated, treated, or prevented through angiogenesis. Thus, for example, mesenchymal stem cells can be administered to animals to treat blocked arteries, including blocked arteries in the limbs, ie, arms, legs, hands, and feet, as well as in the neck or various organs. . For example, mesenchymal stem cells can be used to treat or prevent stroke by treating blocked arteries supplying the brain. In addition, mesenchymal stem cells can be used to treat blood vessels in the embryonic and postnatal corneas, and can be used to organize glomeruli. In another embodiment, mesenchymal stem cells can be used to treat both internal and external wounds, as well as skin ulcers caused by diseases such as diabetes and sickle cell anemia; It can be used to treat skin ulcers found on, but not limited to, the feet, hands, legs or arms.

Additionally, since angiogenesis is involved in embryo implantation and placenta growth, mesenchymal stem cells can be used to promote embryo implantation and prevent miscarriage.

Additionally, mesenchymal stem cells can be administered to an embryonic animal, including humans, to promote the development of a vasculature in the animal.

In another embodiment, mesenchymal stem cells can be administered to fetal or intrauterine animals to promote correct growth plate morphogenesis, as well as to promote cartilage resorption and bone formation.

Mesenchymal stem cells are administered in an amount effective to promote angiogenesis in an animal. Mesenchymal stem cells may be administered in an amount of about 1x10 ⁵ cells/kg to about 1x10 ⁷ cells/kg. In another embodiment, the mesenchymal stem cells are administered in an amount of about 1x10 ⁶ cells/kg to about 5x10 ⁶ cells/kg. The dosage of mesenchymal stem cells depends on a variety of factors, including the age, weight, and sex of the patient, the disease or disorder being treated, alleviated, or prevented, and the extent and severity thereof.

Mesenchymal stem cells can be administered with an acceptable pharmaceutical carrier. For example, mesenchymal stem cells can be administered as a cell suspension in a pharmaceutically acceptable liquid medium for injection. Injections can be made locally, ie into a tissue or organ requiring angiogenesis, or can be made systemic.

Mesenchymal stem cells can be genetically engineered using one or more polynucleotides encoding therapeutic agents. Polynucleotides can be delivered to mesenchymal stem cells via an appropriate expression vehicle. Expression vehicles that can be used to genetically engineer mesenchymal stem cells include, but are not limited to, retroviral vectors, adenoviral vectors, and adeno-associated viral vectors.

Selecting an appropriate polynucleotide encoding a therapeutic agent depends on a variety of factors including the disease or disorder being treated and its extent and severity. Suitable polynucleotides encoding therapeutic agents, and suitable expression vehicles are further described in US Pat. No. 6,355,239.

Mesenchymal stem cells include, but are not limited to, growth factors, cytokines, drugs, such as anti-inflammatory drugs, and cells other than mesenchymal stem cells, such as dendritic cells, when used in the above-mentioned therapies and therapies. It can be used in combination with other therapeutic agents known to those skilled in the art, including but not limited to, can be administered with a soluble carrier for the cells, such as hyaluronic acid, or can be administered with a suitable solid matrix such as collagen, gelatin, or other It should be understood that it can be administered in combination with a biocompatible polymer.

It is to be understood that the methods described herein can be performed in a variety of ways and that various modifications and variations thereof are well known in the art. In addition, any theory presented regarding the mode of action or interaction between cell types should not be construed as limiting the present invention in any way, it is to be understood as being presented so that the methods of the present invention may be more fully understood. can

Accordingly, the present invention will be described with reference to the following figures:
Figure 1 MSCs regulate branch cell function . (a) Flow cytometric analysis of mature monocytic DC1 cells using antibodies against HLA-DR and CD11c and plasmacytoid DC2 cells using antibodies against HLA-DR and CD123 (IL-3 receptor). (---): isotype control; (￣): FITC/PE conjugated antibody. (b) MSCs inhibit TNF-α secretion (first y-axis) and increase IL-10 secretion (second y-axis) from activated DC1 and DC2, respectively. (c) Compared to MSCs or DCs alone, MSCs cultured with mature DC1 cells inhibit IFN-γ secretion by T cells (first y-axis) and increase IL-4 levels (second y-axis). axis). Decreased production of pro-inflammatory IFN-γ and increased production of anti-inflammatory IL-4 in the presence of MSCs indicated that the T cell population had changed to an anti-inflammatory phenotype.
Figure 2 MSCs inhibit pro-inflammatory effector T cell function. (a) T _Reg cell counts by staining PBMC or non-adherent fraction in MSC+PBMC cultures (MSC+PBMC) with FITC-conjugated CD4 (x axis) and PE conjugated CD25 (y axis) antibodies %) of flow cytometric analysis. Gates were set based on an isotype control antibody as background. The graph represents 5 independent experiments. (b) T _H 1 cells generated in the presence of MSCs secreted reduced levels of IFN-γ in the cell culture supernatant (first y axis), and T _H 2 cells generated in the presence of MSCs secreted reduced levels of IFN-γ in the cell culture supernatant. Increased amounts of IL-4 were secreted in the supernatant (second y-axis). (c) MSCs inhibit IFN-γ secretion from purified NK cells cultured in 24-well plates for 0, 24, or 48 hours. Data shown are mean±SD cytokine secretion of one experiment, representing three independent experiments.
Figure 3 MSCs increase the number of T _reg cell populations and increase GITR expression . (a) CD4 ⁺ CD25 ⁺ T _reg cell populations from PBMC or MSC+PBMC (MSC to PBMC ratio 1:10) cultures (cultured without any additional stimulation for 3 days) were isolated using a two-step magnetic isolation method. isolated These cells were irradiated (to block any further proliferation) and found that the responders were allogeneic PBMCs in the presence of phytoerythroagglutinin (PHA) (2.5 mg/ml) (stimulant to responder ratio 1:100). It was used as a stimulator in the mixed lymphocyte response (MLR). After culturing the cells for 48 hours, ³ H thymidine was added and incorporated radioactivity was counted after 24 hours. Results showed that T _reg populations generated in the presence of MSCs (lane 3) were functionally similar to T _reg cells generated in the absence of MSCs (lane 2). (b) After culturing PBMCs in the absence of MSC (top plot) or in the presence of MSC (1:10 ratio of MSC to PBMC) (bottom plot) for 3 days, the non-adherent fraction was harvested and FITC-labeled Immunostaining was performed with GITR and PE-labeled CD4. The results showed that the GITR expression of cells cultured in the presence of MSC was increased more than 2-fold.
FIG. 4 MSCs produce PGE ₂ , and blocking PGE ₂ reverses MSC-mediated immunomodulatory effects . (a) PGE ₂ secretion (mean±SD) in culture supernatants obtained from MSC cultured in the presence or absence of various concentrations of the PGE ₂ blocker NS-398 or indomethacin (Indometh.). Inhibitor concentrations are expressed in μM and the data presented are values obtained after 24 hours incubation. (b) COX-1 and COX-2 expression in MSCs and PBMCs using real-time RT-PCR. MSCs expressed significantly higher levels of COX-2 when compared to PBMCs, and COX-2 expression in MSCs increased more than 3-fold when MSCs were cultured in the presence of PBMCs. Representative data from 1 out of 3 independent experiments are shown. MSC+PBMC cultures were placed in trans-well chamber plates with MSCs plated on the lower chamber and PBMCs plated on the upper chamber. (c) TNF-α secretion from DC activated in the presence of the PGE ₂ blocker indomethacin (Indo.) or NS-398 (□) and IFN-γ from T _H 1 cells when compared to control. Increased secretion (■). Data were calculated as percent change from cultures generated in the absence of MSCs and PGE ₂ inhibitors. (d) Presence of PGE ₂ blockers indomethacin (Ind.) and NS-398 in MSC-PBMC (1:10) co-culture reverses MSC-mediated anti-proliferative effect on PHA-treated PBMCs . Data presented are from one experiment and represent three independent experiments.
5 Constitutive MSC cytokine secretion is elevated in the presence of allogeneic PBMCs . Cytokine IL-6 in culture supernatants using previously characterized human MSCs cultured in the presence of PBMCs (1:10 ratio of MSCs to PBMCs) (hatched bars) or without them (open bars) for 24 hours. and levels of VEGF, lipid mediating factor PGE ₂ , and matrix metalloproteinase 1 (pro MMP-1) were analyzed. MSCs constitutively produced IL-6, VEGF, and PGE ₂ , and levels of these factors were increased upon co-culture with PBMCs, suggesting that MSCs may play an important role in regulating immune responses in an inflammatory environment. do.
Figure 6 MSCs inhibit mitogen-induced T cell proliferation in a dose-dependent manner . Incubation with increasing numbers of allogeneic PBMCs with a constant number of MSCs (2,000 cells/well) plated on a 96-well plate in the presence or absence of PHA (2.5 mg/ml) for 72 hours, ³ H Thymidine incorporation was measured (counts per minute, cpm). Proliferation of PHA-treated PBMCs in the presence of MSCs was inhibited in a dose-dependent manner. Representative data from 1 of 3 independent experiments are shown. Similar results are reported in LeBlanc, et al., Scand J. Immunol. , Vol. 57, pg. 11 (2003)].
Figure 7 Schematic diagram of the proposed MSC mechanism of action. MSCs are derived from both the innate (DC-pathway (2)-(4); and NK-pathway (6)) and adaptive (T-pathway (1) and (5), and B-pathway (7)) immune systems. mediate their immunomodulatory effects by influencing the cells of In response to invading pathogens, immature DCs migrate to potential entry sites, mature, and acquire the ability to prime natural cells (by antigen-specific and costimulatory signals) to become protective effector T cells (cells). -mediated T _H 1 or humoral T _H 2 immunization). Upon MSC-DC interactions, MSCs limit the ability of DCs to initiate cell-mediated responses either by direct cell-to-cell contact or through secreted factors (pathway (2)) or initiate humoral responses. (pathway (4)) can alter the outcome of the immune response. Also, when mature effector T cells are present, they and MSCs interact to shift the balance of the T _H 1 (pathway (1)) response towards the T _H 2 response (pathway (5)), possibly GvHD and autoimmunity. Suppression of disease symptoms can bias toward increasing IgE leading to B cell activity (pathway (7)), which is a desirable outcome. In the ability of MSCs to increase the production of T _Reg populations (pathway (3)), MSCs can give rise to a resistant phenotype and benefit the recipient host by buffering bystander inflammation in their local microenvironment. The dotted line (---) represents the proposed mechanism.

Example 1

materials and methods

Human MSC culture

Human MSCs are described by Pittenger et al., Science . Vol. 284, pg. 143 (1999)]. Briefly, bone marrow samples were collected from the iliac crest of an anonymous donor after obtaining informed consent by Poietics Technologies, Div of Cambrex Biosciences. 1% antibiotic-antimyotic solution (Invitrogen, Carlsbad, CA) and 10% fetal bovine serum (FBS: JRH BioSciences, Lenexa, Kansas) MSCs were cultured in Dulbecco's Modified Eagle's Medium-Low Glucose (Life Technologies, Carlsbad, Calif.) containing MSCs were cultured as adherent monolayers and detached with trypsin/EDTA (0.05% trypsin at 37° C. for 3 minutes). All MSCs used were previously characterized for their multi-lineage potential, which retained the ability to differentiate into mesenchymal lineages (chondrogenic, adipogenic, and osteogenic) (Pittenger, et al. , Science , Vol. 284, pg. 143 (1999)]).

dendritic cell isolation

Peripheral blood mononuclear cells (PBMCs) were obtained from Poietics Technologies, Division of Cambrex Biosciences (Walkersville, MD). See Dzionek, et. al., J. Immunol ., Vol. 165, pg. 6037 (2000)], dendritic cell (DC) precursors of the monocyte lineage (CD1c ⁺ ) were positively selected from PBMCs using a two-step magnetic separation method. Briefly, after CD1c expressing B cells were removed from CD19 ⁺ cells using magnetic beads, the fraction from which the B cells were removed was labeled with biotin-labeled CD1c (BDCA1 ⁺ ) and an anti-biotin antibody, which were described in the manufacturer's instructions ( Separated from the unlabeled cell fraction using a magnetic column according to Miltenyi Biotech, Auburn, Calif. DC precursors of the plasmacytoid lineage were positively labeled antibody coated cells (BDCA2 ⁺ ) (California Milteni Biotech, Auburn, MA) isolated from PBMCs by immuno-magnetic sorting.

MSC-DC culture

In most experiments, human MSCs and DCs were cultured in equal numbers for various periods of time, and cell culture supernatants were collected and stored at -80°C until further evaluation. In selection experiments, MSCs were co-cultured with mature DC1 or DC2 cells (MSC:DC ratio of 1:1) for 3 days, and then the combined cultures (MSCs and DCs) were irradiated to prevent any proliferation. . Antibody purified native allogeneic T cells (CD4 ⁺ , CD45RA ⁺ ) were then added to the irradiated MSC/DC and cultured for an additional 6 days. The non-adherent cell fraction (purified T cells) was then collected from the culture, washed twice and re-stimulated with PHA for an additional 24 hours before the cell culture supernatant was harvested and subjected to ELISA. It was analyzed for IFN-γ and IL-4 secreted by .

NK cell isolation

Biotin-conjugated monoclonal antibodies (anti-CD3, -CD14, -CD19, -CD36 and anti-IgE antibodies) as the first reagent and anti-biotin monoclonal conjugated to microbeads as the second labeling reagent. A purified NK cell population was obtained by removing magnetically labeled non-NK cells using a cocktail of antibodies. Miraculously labeled non-NK cells were maintained on a MACS (Milteni Biotech, Auburn, Calif.) column in a magnetic field, while NK cells were collected by passage.

T _Reg Isolation of cell populations

T _Reg cell populations were isolated using a two-step isolation method. First, non-CD4 ⁺ T cells were indirectly magnetically labeled using a cocktail of biotin-labeled antibodies and anti-biotin microbeads. The labeled cells were then removed by separation on a MACS column (Milteni Biotech, Auburn, Calif.). CD4 ⁺ CD25 ⁺ cells were then directly labeled using CD25 microbeads and isolated by positive selection from the previously enriched CD4 ⁺ T cell fraction. Magnetically labeled CD4 ⁺ CD25 ⁺ T cells were maintained on the column and eluted after removal of the column from the magnetic field.

^Cultures of PBMC or MSC ⁺ PBMC (MSC to PBMC ratio 1:10) (3 days CD4 ⁺ CD25 ⁺ T _reg cell populations were isolated from cultured cells without any additional stimulation during the period. Irradiated these cells to block any further proliferation and as a stimulator in the mixed lymphocyte reaction (MLR) where the responders are allogeneic PBMCs (1:100 stimulator to responder ratio) in the presence of PHA (2.5 μg/ml) used After incubation was carried out for 48 hours, ³ H thymidine was added. The incorporated radioactivity was counted after 24 hours.

After culturing PBMCs in the absence or presence of MSCs (1:10 ratio of MSCs to PBMCs), the non-adherent fraction was harvested, FITC-labeled glucocorticoid-induced TNF receptor (or GITR), and PE-labeled immunostained with CD4.

T _H 1/T _H 2 cell generation

In order to remove monocytes, peripheral blood mononuclear cells (PBMC) were plated at 2x10 ⁶ cells/ml at 37°C for 45 minutes. The non-adherent fraction was treated with T _H 1 (IL-2 (4 ng/ml) + IL-12 (5 ng/ml) + anti-IL-4 (1 μg/ml) in the presence or absence of MSCs for 3 days. ) or plate-bound anti-CD3 (5 μg) under T _H 2 (IL-2 (4 ng/ml) + IL-4 (4 ng/ml) + anti-IFN-γ (1 μg/ml)) conditions /ml) and anti-CD28 (1 μg/ml) antibody. After washing the cells and re-stimulating with PHA (2.5 μg/ml) for an additional 24 or 48 hours, IFN-γ and IL-4 levels were measured by ELISA (R&D Systems, Minneapolis, MN). ) in the culture supernatant.

VEGF, PGE in MSC culture supernatant ₂ , and analysis of pro-MMP-1 levels

Interleukin-6 (IL-6), VEGF, Lipid Mediating Factors in Culture Supernatants Cultured in the Presence of PBMCs (1:10 Ratio of MSCs to PBMCs) or Without PBMCs Using Human MSCs Characterized Above for 24 Hours Levels of prostaglandin E ₂ (PGE ₂ ), and matrix metalloproteinase 1 (pro-MMP-1) were assayed.

PBMC proliferation

Purified PBMC was prepared by centrifuging Leukopaq (Cambrex, Walkersville, MD) over Ficoll-Hypaque (Lymphoprep, Oslo, Norway). Isolated cells were isolated in the presence or absence of MSCs (plated for 3-4 hours prior to addition of PBMCs to allow for settling) in the presence of the mitogen PHA (Sigma Chemicals, St. Louis, Mo.) for 48 hours. cultured (in triplicate). In selection experiments, PBMCs were resuspended in media containing the PGE ₂ inhibitor indomethacin (Sigma Chemicals, St. Louis, Mo.) or NS-938 (Cayman Chemicals, Ann Arbor, Mich.). ( ³ H)-thymidine was added (20 μl in a 200 μl culture), and cells were harvested using an automatic harvester after further culturing for 24 hours. The effect of MSC or PGE ₂ blockers was calculated as a percentage of the control response (100%) in the presence of PHA.

Quantitative RT-PCR

Total RNA was prepared from cell pellets using a commercially available kit (Qiagen, Valencia, CA) according to the manufacturer's instructions. Contaminating genomic DNA was removed using a DNA-free kit (Ambion, Austin, TX). MJ Research Option Detection System (South San Francisco, CA) using the QuantiTect SYBR Green RT-PCR kit (Qiagen, Valencia, CA) with primers at a concentration of 0.5 μM. Quantitative RT-PCR was performed. Relative changes in expression levels of cells cultured under different conditions were calculated by differences in Ct values (crossover points) using β-actin as an internal control. The sequences for COX-1 and COX-2 specific primers are COX-1: 5'-CCG GAT GCC AGT CAG GAT GAT G-3' (forward), 5'-CTA GAC AGC CAG ATG CTG ACA G-3' ( reverse); COX-2: 5'-ATC TAC CCT CCT CAA GTC CC-3' (forward), 5'-TAC CAG AAG GGC AGG ATA CAG-3' (reverse).

Incubation with increasing numbers of allogeneic PBMCs with a constant number of MSCs (2,000 cells/well) plated on a 96-well plate in the presence of PHA (2.5 μg/ml) for 72 hours, ³ H thymidine Incorporation was measured (counts per minute, cpm). PBMC and MSC were cultured at a ratio of MSC:PBMC of 1:1, 1:3, 1:10, 1:30, and 1:81.

result

In this study, interactions between human MSCs and isolated immune cell populations were investigated, including dendritic cells (DC1 and DC2), effector T cells (T _H 1 and T _H 2) and NK cells. Interactions between MSCs and each immune cell type had specific consequences, suggesting that MSCs can regulate multiple steps in the immune response process. The production of secreted factor(s) that modulates and may be responsible for MSC immunomodulatory effects is assessed, and prostaglandin synthesis is implicated.

Myeloid (DC1) and plasmacytoid (DC2) precursor dendritic cells were isolated by immuno-magnetic sorting of BDCA1 ⁺ and BDCA2 ⁺ cells, respectively, and for DC1 cells, GM-CSF and IL-4 (1x10 ³ IU/ ml and 1× ^{10 3} IU/ml), or IL-3 (10 ng/ml) for DC2 cells. Flow cytometry was used, DC1 cells were HLA-DR ⁺ and CDHc ⁺ , whereas DC2 cells were HLA-DR ⁺ and CD123 ⁺ (Fig. 1A). DC1 cells produced moderate levels of TNF-α in the presence of the proinflammatory bacterial lipopolysaccharide (LPS, 1 ng/ml), but in the presence of MSCs (irradiated at a ratio of 1:1 to 1:10), TNF -α secretion was reduced by more than 50% (FIG. 1B). On the other hand, in the presence of LPS, DC2 cells produced IL-10, the level of which increased more than 2-fold upon MSC:DC2 co-culture (1:1) (FIG. 1B). Therefore, MSCs altered the cytokine profile of DCs activated in culture towards a more resistant phenotype. Additionally, when the activated DCs were cultured with MSCs, they were able to decrease IFN-γ and increase the level of IL-4 secreted by native CD4 ⁺ T cells (Fig. 1C), indicating a pro-inflammatory phenotype. suggests an MSC-mediated shift from a to an anti-inflammatory T-cell phenotype.

Since increased IL-10 secretion plays an important role in regulatory cell generation (Kingsley, et al., J. Immunol . Vol. 168, pg. 1080 (2002)), flow cytometry in PBMC and MSC co-cultures T-regulatory cells (T _Reg ) were quantified by measurement. When PBMCs were cultured with MSCs for 3-5 days, the number of T _Reg cells increased (Fig. 2A), as measured by staining PBMCs with anti-CD4 and anti-CD25 antibodies, which further MSC-derived. Demonstrate an acceptable immunosorbent response. CD4 ⁺ CD25 ⁺ T _Reg cell populations generated in the presence of MSCs expressed increased levels of glucocorticoid-induced TNF receptor (GITR), a cell surface receptor expressed on T _Reg cell populations, and inhibited allogeneic T cell proliferation. Inhibited (Fig. 3A,B), it was inhibitory in nature. MSCs were then investigated for their direct ability to influence T cell differentiation. Antibody-selected purified T cells (CD4 ⁺ Th cells) were used to generate IFN-γ-producing T _H 1 and IL-4-producing T _H 2 cells in the presence or absence of MSCs. In the presence of MSCs during differentiation, IFN-γ secretion by T _H 1 cells decreased, and IL-4 secretion by T _H 2 cells increased (FIG. 2B). No significant changes in IFN-γ or IL-4 levels were observed when MSCs were added to the cultures after Th cells had differentiated into effector T _H 1 or T _H 2 types (day 3) (data not shown). not shown). These experiments suggest that MSCs can directly affect effector T cell differentiation and alter T cell cytokine secretion towards a humoral phenotype.

Similarly, when MSCs were cultured at a 1:1 ratio with purified NK cells (CD3-, CD14-, CD19-, CD36-) for different periods of time (0-48 hrs), IFN-γ in the culture supernatant Secretion was reduced, suggesting that MSCs may also regulate NK cell function as well.

Previous studies have suggested that MSCs modify T-cell function by soluble factor(s) (LeBlanc, et al., Exp. Hematol . Vol. 31, pg. 890 (2003)); [Tse, et al., Transplantation , Vol. 75, pg. 389 (2003)])). MSC constitutively secreted several factors including IL-6, prostaglandin E ₂ , VEGF and pro-MMP-1, and the levels of each increased when cultured with PBMCs ( FIG. 5 ). To investigate the MSC-derived factors that inhibit TNF-α and increase IL-10 production by DCs, the potential role of prostaglandin E ₂ as shown to inhibit TNF-α production by activated DCs. (Vassiliou, et al., Cell. Immunol . Vol. 223, pg. 120 (2003)). Conditioned media from MSC cultures (0.5×10 ⁶ cells/ml of 24 hour culture) contained approximately 1000 pg/ml of PGE ₂ ( FIG. 4A ). Known inducers of PGE ₂ secretion, such as TNF-α, IFN-γ or IL-1β, in the culture supernatant, indicating constitutive secretion of PGE ₂ by MSCs, were not detectably present (data not shown). not). In the presence of inhibitors of PGE ₂ production, NS-398 (5 μM) and indomethacin (4 μM), PGE ₂ secretion by hMSC was inhibited by 60-90% ( FIG. 4A ). PGE ₂ secretory release occurs as a result of the enzymatic activity of constitutively active cyclooxygenase enzyme 1 (COX-1) and inducible cyclooxygenase enzyme 2 (COX-2) (Harris, et al. , Trends Immunol. , Vol. MSCs expressed COX-2 at significantly higher levels compared to PBMCs, and the expression level increased more than 3-fold when MSCs and PBMCs (1:10 ratio of MSCs to PBMCs) were co-cultured for 24 hours. (Fig. 4B). Small changes were observed in COX-1 levels, suggesting that the increased PGE ₂ secretion upon MSC-PBMC co-culture (FIG. 5) is mediated by COX-2 upregulation. To investigate whether the immunomodulatory effect on DC and T-cells is mediated by PGE ₂ , MSCs were treated with activated dendritic cells (DC1) or T _H 1 cells in the presence of the PGE ₂ inhibitor NS-398 or indomethacin. cultured. The presence of NS-398 or indomethacin increased TNF-α secretion by DC1 and IFN-γ secretion from T _H 1 cells, respectively (Fig. 4C), suggesting that MSC effects on immune cell types were not mediated by PGE ₂ . suggest that it can be mediated. Recent studies have shown that MSCs inhibit T-cell proliferation induced by a variety of stimuli (DeNicola, et al., Blood , Vol. 99, pg. 3838 (2002); LeBlanc, et al. ., Scand. J. Immunol ., Vol. 57, pg. 11 (2003)])). It was observed that MSC inhibited mitogen-induced T cell proliferation in a dose-dependent manner (FIG. 6), and in the presence of the PGE ₂ inhibitor NS-398 (5 μM) or indomethacin (4 μM), the inhibitor ³ H thymidine incorporation by PHA-treated PBMCs in MSC-containing cultures increased by more than 70% when compared to no controls (Fig. 4D).

In summary, we propose a model of interaction between MSCs and other immune cell types (FIG. 7). When mature T cells are present, MSCs can directly interact with mature T cells, inhibit pro-inflammatory IFN-γ production (pathway (1)), regulate the T cell phenotype (pathway (3)) and anti- may promote inflammatory T _H 2 cells (pathway (5)). Additionally, MSCs stimulate DCs by secreting PGE ₂ , inhibiting pro-inflammatory DC1 cells (pathway (2)), and promoting anti-inflammatory DC2 cells (pathway (4)) or regulatory DCs (pathway (3)). can alter the outcome of the T cell immune response through Consequently, shifts toward T _H 2 immunity suggest a shift in B cell activity toward increased production of IgE/IgG1 subtype antibodies (pathway (7)). MSCs can modify NK cell function by their ability to inhibit IFN-γ secretion from NK cells (pathway (6)). This MSC:immune cell interaction model is consistent with experiments conducted by several other laboratories (LeBlanc, et al., Exp. Hematol ., Vol. 31, pg. 890 (2003); Tse, et al. al., Transplantation.Vol.75 , pg.389 (2003)] [DiNicola, et al., Blood.Vol.99 , pg.3838 (2002)])). Further studies on the proposed mechanism are in progress, and animal studies are currently needed to study the in vivo effects of MSC administration.

Example 2

A 33-year-old female patient with severe grade IV gastrointestinal graft-versus-host disease (GVHD) was administered mesenchymal stem cells. The patient was unresponsive to all other GVHD therapies. Endoscopic imaging of the patient's colon revealed areas of ulceration and inflammation prior to treatment. A histological study of the patient's colon showed that graft-versus-host disease had destroyed most of the patient's intestinal glands prior to treatment.

Allogeneic mesenchymal stem cells in 50 ml of Plasma Lyte A were injected intravenously in an amount of 3 X 10 ⁶ per 1 kg of body weight and administered to the patient.

Patients were evaluated 2 weeks after infusion. Two weeks after injection, an endoscopy of the patient's colon showed that the areas of inflammation and ulceration observed before treatment had healed. Additionally, a colonic biopsy of the patient showed marked regeneration of the intestinal glands. Thus, by administering mesenchymal stem cells to patients, the inflammatory component of gastrointestinal graft-versus-host disease was significantly reduced, and new functional intestinal tissues were regenerated.

The disclosures of all patents and publications, including published patent applications, depository accession numbers, and database accession numbers, are provided where each patent, publication, depository accession number, and database accession number is specifically and individually incorporated by reference. are incorporated by reference to the same extent as

However, it should be understood that the scope of the present invention is not limited to the specific embodiments described above. The invention may be practiced other than as specifically described, which may still fall within the scope of the appended claims.

SEQUENCE LISTING <110> Aggarwal, Sudeepta Pittenger, Mark F. Varney, Timothy Danilkovitch, Alla <120> MESENCHYMAL STEM CELLS AND USES THEREFOR <130> 19231US03 <140> US 11/726,676 <141> 2007-03-22 <150> US 11/541,853 <151> 2006-10-02 <150> US 11/080,298 <151> 2005-03-15 <150> US 60/555,118 <151> 2004-03-22 <160> 4 <170> PatentIn version 3.3 <210> 1 <211> 22 <212> DNA <213> artificial <220> <223> synthetic sequences and are primers for PCR derived from human COX-1 <220> <221> misc_feature <222> (1)..(22) <223> COX-1 forward primer <400> 1 ccggatgcca gtcaggatga tg 22 <210> 2 <211> 22 <212> DNA <213> artificial <220> <223> synthetic sequences and are primers for PCR derived from human COX-1 <220> <221> misc_feature <222> (1)..(22) <223> COX-1 reverse primer <400> 2 ctagacagcc agatgctgac ag 22 <210> 3 <211> 20 <212> DNA <213> <220> <223> synthetic sequences and are primers for PCR derived from human COX-2 <220> <221> misc_feature <222> (1)..(20) <223> COX-2 forward primer <400> 3 atctaccctc ctcaagtccc 20 <210> 4 <211> 21 <212> DNA <213> artificial <220> <223> primer for PCR derived from human COX-2 <220> <221> misc_feature <222> (1)..(21) <223> COX-2 reverse primer <400> 4 taccagaagg gcaggataca g 21

Claims (1)

It comprises an effective amount of mesenchymal stem cells that have not been genetically engineered, and is administered to an animal, wherein the mesenchymal stem cells promote increased secretion of anti-inflammatory cytokines and the effective amount is 1 x 10 ⁵ to 1 x 10 ⁷ cells /kg, use of a pharmaceutical composition for modulating the immune response in an animal suffering from an autoimmune or inflammatory disease.

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