FGF8-FGFR1是保持小鼠精原干细胞未分化状态的生境因子

cartoonyang

FGF8-FGFR1 Signaling Acts as a Niche Factor for Maintaining Undifferentiated Spermatogonia in the Mouse1+ m1 c" K3 e3 i+ Q% I

! _, x/ S- y  w3 ?Published online before print October 30, 2014, doi: 10.1095/​biolreprod.114.121012, _' N2 A; d" t# Y
Biology of Reproduction December 1, 2014 vol. 91 no. 6 145, B2 L; K* d5 e  N1 ?

# m4 i7 X% N! M' O- {ABSTRACT0 \+ r1 ]1 B4 Y  Q/ r( @! b
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In mammalian testes, spermatogonial stem cells (SSCs) maintain spermatogenesis over a long period of time by undergoing self-renewal and differentiation. SSCs are among the most primitive of spermatogenic cells (undifferentiated spermatogonia), and their activities are strictly regulated by extrinsic niche factors. However, the factors that constitute a testicular niche remain poorly understood. In this study, we demonstrate that fibroblast growth factor (FGF) signaling maintains undifferentiated spermatogonia through activating ERK1/2 signaling in vivo. Undifferentiated spermatogonia comprise GFRA1+ and NANOS3+ subpopulations, which are likely to undergo self-renewal and enter the differentiation pathway, respectively. In the testis, Fgfr1 was expressed in the entire population of undifferentiated spermatogonia, and deleting FGFR1 in spermatogenic cells partially inactivated ERK1/2 and resulted in reduced numbers of both GFRA1+ and NANOS3+ cells. In addition, Fgf8 was expressed in spermatogenic cells, and loss- and gain-of-function models of FGF8 demonstrated that FGF8 positively regulated the numbers of undifferentiated spermatogonia through FGFR1, particularly among NANOS3+ cells. Finally we show a possible involvement of FGF signaling in the reversion from NANOS3+ into GFRA1+ undifferentiated spermatogonia. Taken together, our data suggest that FGF signaling is an important component of the testicular niche and has a unique function for maintaining undifferentiated spermatogonia.) t" A2 W. L8 o
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Key words: developmental biology knockout model Sertoli cells signal transduction spermatogonial stem cells transgenic model
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yeshch

求原文，亲爱的楼主

yeshch

thanks a lot

yeshch

thanks a lot