Abstract
As the phenotype of adult dermal stem cells is still elusive, and the hematopoietic stem cell is one of the best-characterized stem cells in the body, we tested dermal cell suspensions, sections, and wholemounts in newborn and adult mice for hematopoietic stem cell marker expression. Phenotypic analysis revealed that a small population of CD45(+) cells and a large population of CD45(-) cells expressed CD34, CD117, and stem cell antigen-1 molecules. When cultivated in selected media supplemented with hematopoietic cytokines, total dermal cells, lineage(-), and/or highly enriched phenotypically defined cell subsets produced hematopoietic and nonhematopoietic colonies. When injected into lethally irradiated recipient mice, a small percentage of newborn dermal cells was able to migrate into hematopoietic tissues and the skin and survived through the 11-month monitoring period. Our ability to isolate a candidate autologous stem cell pool will make these cells ideal vehicles for genetic manipulation and gene therapy.
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