Adult reserve stem cells and their potential for tissue engineering |
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Authors: | Henry E. Young Cecile Duplaa Marina Romero-Ramos Marie-Francoise Chesselet Patrick Vourc'h Michael J. Yost Kurt Ericson Louis Terracio Takayuki Asahara Haruchika Masuda Sayaka Tamura-Ninomiya Kristina Detmer Robert A. Bray Timothy A. Steele Douglas Hixson Mohammad el-Kalay Brain W. Tobin Roy D. Russ Michael N. Horst Julie A. Floyd Nicholas L. Henson Kristina C. Hawkins Jaime Groom Amar Parikh Lisa Blake Laura J. Bland Angela J. Thompson Amy Kirincich Catherine Moreau John Hudson Frank P. Bowyer III T. J. Lin Asa C. Black Jr. |
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Affiliation: | (1) Division of Basic Medical Sciences, Mercer University School of Medicine, 1550 College Street, Macon, GA;(2) Department of Pediatrics, Mercer University School of Medicine, 1550 College Street, Macon, GA;(3) Department of Obstetrics and Gynecology, Mercer University School of Medicine, 1550 College Street, Macon, GA;(4) Department of Internal Medicine, Mercer University School of Medicine, 1550 College Street, Macon, GA;(5) INSERM U441, Avenue du Haut Leveque, France;(6) Department of Neurology, UCLA School of Medicine, Reed Neurological Research Center, Los Angeles, GA;(7) Department of Surgery, University of South Carolina School of Medicine, Columbia, SC;(8) New York University College of Dentistry, New York, NY;(9) Cardiovascular Research and Medicine, Tufts University School of Medicine, Elizabeth's Medical Center, Boston, MA;(10) Kobe Institute of Biomedical Research and Innovation/RIKEN Center of Developmental Biology, Chuo, Kobe, Japan;(11) Department of Pathology and Laboratory Medicine, Emory University Hospital, Atlanta, GA;(12) Des Moines University-Osteopathic Medical Center, Des Moines, IA;(13) Department of Medicine, Brown University, Providence, RI;(14) MorphoGen Pharmaceuticals, Inc., San Diego, CA |
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Abstract: | Tissue restoration is the process whereby multiple damaged cell types are replaced to restore the histoarchitecture and function to the tissue. Several theories, have been proposed to explain the phenomenon of tissue restoration in amphibians and in animals belonging to higher order. These theories include dedifferentiation of damaged tissues, transdifferentiation of lineage-committed progenitor cells, and activation of reserve, precursor cells. Studies by Young et al. and others demonstrated that connective tissue compartments throughout postnatal individuals contain reserve precursor cells. Subsequent repetitive single cell-cloning and cell-sorting studies revealed that these reserve precursor cells consisted of multiple populations of cells, including, tissue-specific progenitor cells, germ-layer lineage stem cells, and pluripotent stem cells. Tissue-specific progenitor cells display various capacities for differentiation, ranging from unipotency (forming a single cell type) to multipotency (forming multiple cell types). However, all progenitor cells demonstrate a finite life span of 50 to 70 population doublings before programmed cell senescence and cell death occurs. Germ-layer lineage stem cells can form a wider range of cell types than a progenitor cell. An individual germ-layer lineage stem cell can form all cells types within its respective germ-layer lineage (i.e., ectoderm, mesoderm, or endoderm). Pluripotent stem cells can form a wider range of cell types than a single germ-layer lineage stem cell. A single pluripotent stem cell can form cells belonging to all three germ layer lineages. Both germ-layer lineage stem cells and pluripotent stem cells exhibit extended capabilities for self-renewal, far surpassing the limited life span of progenitor cells (50–70 population doublings). The authors propose that the activation of quiescent tissue-specific progenitor cells, germ-layer lineage stem cells, and/or pluripotent stem cells may be a potential explanation, along with dedifferentiation and transdifferentiation, for the process of tissue restoration. Several model systems are currently being investigated to determine the possibilities of using these adult quiescent reserve precursor cells for tissue engineering. |
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Keywords: | Adult pluripotent stem cells mammals humans embyonic mesenchymal neurodegenerative diabetes infarction |
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