Mesenchymal stem cells (MSCs) are stromal cells that have the ability to self-renew and also exhibit multilineage differentiation into both mesenchymal and nonmesenchymal lineages. The intrinsic properties of these cells make them an attractive candidate for clinical applications. MSCs are of keen interest because they can be isolated from a small aspirate of bone marrow or adipose tissues and can be easily expanded in vitro. Moreover, their ability to modulate immune responses makes them an even more attractive candidate for regenerative medicine as allogeneic transplant of these cells is feasible without a substantial risk of immune rejection. MSCs secrete various immunomodulatory molecules which provide a regenerative microenvironment for a variety of injured tissues or organ to limit the damage and to increase self-regulated tissue regeneration. Autologous/allogeneic MSCs delivered via the bloodstream augment the titers of MSCs that are drawn to sites of tissue injury and can accelerate the tissue repair process. MSCs are currently being tested for their potential use in cell and gene therapy for a number of human debilitating diseases and genetic disorders. This paper summarizes the current clinical and nonclinical data for the use of MSCs in tissue repair and potential therapeutic role in various diseases. 1. Introduction Stem cells are immature tissue precursor cells which are able to self-renew and differentiate into multiple cell lineages [1, 2]. Mesenchymal stem cells (MSCs), also known as multipotent mesenchymal stromal cells, are self-renewing cells which can be found in almost all postnatal organs and tissues [3, 4]. MSCs have received wider attention because they can be easily isolated from a small aspirate of bone marrow or adipose tissue and can be expanded to clinical scales in in vitro condition. Other than these MSCs offer several other advantages like long-term storage without major loss of potency and no adverse reactions to allogeneic MSCs transplant [5]. In 1976 Friedenstein et al. firstly described a method for MSCs (referred as “stromal cells”) isolation from whole bone marrow aspirates based on differential adhesion properties. They suggested that these cells are adherent, clonogenic, nonphagocytic, and fibroblastic in nature, with the ability to give rise to colony forming units-fibroblastic (CFU-F) [6]. In late 1980s Owen and Friedenstein reported heterogeneity of the bone marrow stromal cells for the first time [7, 8]. Bone marrow stromal cells were further characterized and named mesenchymal stem cell to describe the
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