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      Journey of Mesenchymal Stem Cells for Homing: Strategies to Enhance Efficacy and Safety of Stem Cell Therapy

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          Abstract

          Human mesenchymal stem cells (MSCs) communicate with other cells in the human body and appear to “home” to areas of injury in response to signals of cellular damage, known as homing signals. This review of the state of current research on homing of MSCs suggests that favorable cellular conditions and the in vivo environment facilitate and are required for the migration of MSCs to the site of insult or injury in vivo. We review the current understanding of MSC migration and discuss strategies for enhancing both the environmental and cellular conditions that give rise to effective homing of MSCs. This may allow MSCs to quickly find and migrate to injured tissues, where they may best exert clinical benefits resulting from improved homing and the presence of increased numbers of MSCs.

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          Concise review: mesenchymal stem/multipotent stromal cells: the state of transdifferentiation and modes of tissue repair--current views.

          Donald G. Phinney, Darwin J. Prockop (2007)
          Mesenchymal stem cells or multipotent stromal cells (MSCs) isolated from the bone marrow of adult organisms were initially characterized as plastic adherent, fibroblastoid cells with the capacity to generate heterotopic osseous tissue when transplanted in vivo. In recent years, MSCs or MSC-like cells have been shown to reside within the connective tissue of most organs, and their surface phenotype has been well described. A large number of reports have also indicated that the cells possess the capacity to transdifferentiate into epithelial cells and lineages derived from the neuroectoderm. The broad developmental plasticity of MSCs was originally thought to contribute to their demonstrated efficacy in a wide variety of experimental animal models of disease as well as in human clinical trials. However, new findings suggest that the ability of MSCs to alter the tissue microenvironment via secretion of soluble factors may contribute more significantly than their capacity for transdifferentiation in tissue repair. Herein, we critically evaluate the literature describing the plasticity of MSCs and offer insight into how the molecular and functional heterogeneity of this cell population, which reflects the complexity of marrow stroma as an organ system, may confound interpretation of their transdifferentiation potential. Additionally, we argue that this heterogeneity also provides a basis for the broad therapeutic efficacy of MSCs.
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            Mesenchymal Stromal Cells: Current Understanding and Clinical Status

            Husein Salem, Chris Thiemermann (2009)
            Multipotent mesenchymal stromal cells (MSCs) represent a rare heterogeneous subset of pluripotent stromal cells that can be isolated from many different adult tissues that exhibit the potential to give rise to cells of diverse lineages. Numerous studies have reported beneficial effects of MSCs in tissue repair and regeneration. After culture expansion and in vivo administration, MSCs home to and engraft to injured tissues and modulate the inflammatory response through synergistic downregulation of proinflammatory cytokines and upregulation of both prosurvival and antiinflammatory factors. In addition, MSCs possess remarkable immunosuppressive properties, suppressing T-cell, NK cell functions, and also modulating dentritic cell activities. Tremendous progress has been made in preclinical studies using MSCs, including the ability to use allogeneic cells, which has driven the application of MSCs toward the clinical setting. This review highlights our current understanding into the biology of MSCs with particular emphasis on the cardiovascular and renal applications, and provides a brief update on the clinical status of MSC-based therapy.
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              Mesenchymal Stem Cell-Based Tissue Regeneration is Governed by Recipient T Lymphocyte via IFN-γ and TNF-α

              Yi Liu-Chittenden, Lei Wang, Takashi Kikuiri … (2011)
              Stem cell-based regenerative medicine is a promising approach for tissue reconstruction. Here, we showed that pro-inflammatory T cells in the recipients inhibited bone marrow mesenchymal stem cell (BMMSC)-mediated bone formation via T helper 1 (Th1) cytokine interferon (IFN)-γ induced down-regulation of runt-related transcription factor 2 (Runx-2) pathway and tumor necrosis factor (TNF)-α-regulated BMMSC apoptosis. TNF-α converted IFN-γ-activated non-apoptotic Fas to a caspase 3/8-associated apoptotic signaling in BMMSCs through inhibition of nuclear factor kappa B (NFκB), resulting in BMMSC apoptosis. Conversely, reduction of IFN-γ and TNF-α levels by systemic infusion of Foxp3+ regulatory T cells (Tregs) markedly improved BMMSC-based bone regeneration and calvarial defect repair in C57BL6 mice. Furthermore, we showed that local administration of aspirin reduced levels of IFN-γ and TNF-α at the implantation site and significantly improved BMMSC-based calvarial defect repair. These data collectively uncover a previously unrecognized role of recipient T cells in BMMSC-based tissue engineering.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Stem Cells Int
                Journal ID (iso-abbrev): Stem Cells Int
                Journal ID (publisher-id): SCI
                Title: Stem Cells International
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 1687-966X
                ISSN (Electronic): 1687-9678
                Publication date (Print): 2012
                Publication date (Electronic): 13 June 2012
                Volume: 2012
                Electronic Location Identifier: 342968
                Affiliations
                Stem Cell Research Center, RNL BIO, Gasan-Dong, Geumcheon-Gu, Seoul 153-768, Republic of Korea
                Author notes
                *Jeong Chan Ra: jcra@ 123456rnl.co.kr

                Academic Editor: Reinhard Henschler

                Article
                DOI: 10.1155/2012/342968
                PMC ID: 3382267
                PubMed ID: 22754575
                SO-VID: 79a1d31e-32ce-4394-959e-c236e0e5c77d
                Copyright © Copyright © 2012 Sung Keun Kang et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 3 February 2012
                Date revision received : 6 April 2012
                Date accepted : 17 April 2012
                Categories
                Subject: Review Article

                ScienceOpen disciplines: Molecular medicine
                Data availability:
                ScienceOpen disciplines: Molecular medicine

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