Abstract
Mesenchymal stem cells derived from bone marrow are a well characterized population of adult stem cells that can be maintained and propagated in culture for a long time with the capacity to form a variety of cell types. Reports have shown that murine and human embryonic stem cells can differentiate into primordial germ cells and then to early gametes. Evidence has indicated that some adult stem cells also have the potential to differentiate into germ cells. Currently, there are no reports on directed differentiation of human mesenchymal stem cells into germ cells. This study investigated the ability of retinoic acid and testicular extracts to induce human bone marrow stem cells (hBMSC) to differentiate into male germ cells. It was found that a small population of hBMSC seem to transdifferentiate into male germ cell-like cells. These cells expressed early germ cell markers OCT4, STELLA, NANOG and VASA, and male germ-ceil-specific markers such as DAZL, TH2, c-kit, beta(1)-integrin, ACR, PRMl, FSHR, STRA8 and SCP3, as analysed by reverse transcription-polymerase chain reaction and immunohistochemistry. These results demonstrated that hBMSC may differentiate into male germ cells and the same could be used as a potential source of cells for reproductive toxicological studies.
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