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标题：Reprogramming of Sertoli cells to fetal-like Leydig cells by Wt1 ablation
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作者：Lianjun Zhang ; Min Chen ; Qing Wen 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2015
卷号：112
期号：13
页码：4003-4008
DOI：10.1073/pnas.1422371112
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：SignificanceGenetic control of the differentiation between Sertoli cells and granulosa cells has been reported previously. However, the relationship between Sertoli cells and Leydig cells in the testis has not yet been definitively determined. In the present study, we demonstrate for the first time, to our knowledge, that these two cell types can be mutually reprogrammed and that Wilms' Tumor Gene 1 (Wt1) plays a critical role in this process. This study provides a novel concept for cell fate determination in testis development that will improve our understanding of the regulatory mechanisms of gonad development. Sertoli and Leydig cells, the two major somatic cell types in the testis, have different morphologies and functions. Both are essential for gonad development and spermatogenesis. However, whether these cells are derived from the same progenitor cells and the mechanism regulating the differentiation between these two cell types during gonad development remains unclear. A previous study showed that overactivation of Ctnnb1 (cadherin-associated protein, beta 1) in Sertoli cells resulted in Sertoli cell tumors. Surprisingly, in the present study, we found that simultaneous deletion of Wilms' Tumor Gene 1 (Wt1) and overactivation of Ctnnb1 in Sertoli cells led to Leydig cell-like tumor development. Lineage tracing experiments revealed that the Leydig-like tumor cells were derived from Sertoli cells. Further studies confirmed that Wt1 is required for the maintenance of the Sertoli cell lineage and that deletion of Wt1 resulted in the reprogramming of Sertoli cells to Leydig cells. Consistent with this interpretation, overexpression of Wt1 in Leydig cells led to the up-regulation of Sertoli cell-specific gene expression and the down-regulation of steroidogenic gene expression. These results demonstrate that the distinction between Sertoli cells and Leydig cells is regulated by Wt1, implying that these two cell types most likely originate from the same progenitor cells. This study thus provides a novel concept for somatic cell fate determination in testis development that may also represent an etiology of male infertility in human patients.
关键词：Wt1 ; β-catenin ; Sertoli cells ; Leydig cells ; transdifferentiation