期刊
DEVELOPMENT
卷 135, 期 22, 页码 3745-3753出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.024786
关键词
Notch; Stem cells; Leydig cell; Germ cell; Testis cord; Hes1; Mouse
资金
- NIH [HD39963, HL63054, DK076647A]
- Duke University Medical Center
During testis development, fetal Leydig cells increase their population from a pool of progenitor cells rather than from proliferation of a differentiated cell population. However, the mechanism that regulates Leydig stem cell self-renewal and differentiation is unknown. Here, we show that blocking Notch signaling, by inhibiting gamma-secretase activity or deleting the downstream target gene Hairy/Enhancer-of-split 1, results in an increase in Leydig cells in the testis. By contrast, constitutively active Notch signaling in gonadal somatic progenitor cells causes a dramatic Leydig cell loss, associated with an increase in undifferentiated mesenchymal cells. These results indicate that active Notch signaling restricts fetal Leydig cell differentiation by promoting a progenitor cell fate. Germ cell loss and abnormal testis cord formation were observed in both gain- and loss-of-function gonads, suggesting that regulation of the Leydig/interstitial cell population is important for male germ cell survival and testis cord formation.
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