Headcase promotes cell survival and niche maintenance in the Drosophila testis.

Headcase promotes cell survival and niche maintenance in the Drosophila testis.
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DOI:
10.1371/journal.pone.0068026
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Jones DL
Jones DL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Resende LP;Boyle M;Tran D;Fellner T;Jones DL

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在果蝇睾丸的顶端,生殖系干细胞和体细胞干细胞围绕着一群被称为中枢的体细胞。中枢细胞产生一种自我更新因子,即未配对(UPD),它激活相邻干细胞中的JAK-STAT途径,以调节干细胞的行为。因此,顶端中枢细胞是睾丸干细胞生态位的重要组成部分。在筛选涉及调节集线器维护的因素的过程中,我们确定了头箱(HDC)。被HDC耗尽的HUB细胞经历了程序性细胞死亡,这表明抗凋亡途径在维持利基环境中发挥着重要作用。以HDC为范式,我们在这里描述了第一个关于渐进性利基减少对睾丸干细胞库的影响的全面分析。令人惊讶的是,单个中枢细胞仍然能够支持大量干细胞,这表明尽管利基支持细胞的大小和数量影响干细胞的维持,但睾丸干细胞利基似乎在严重损伤后支持干细胞的能力非常强大。
At the apical tip of the Drosophila testis, germline and somatic stem cells surround a cluster of somatic cells called the hub. Hub cells produce a self-renewal factor, Unpaired (Upd), that activates the JAK-STAT pathway in adjacent stem cells to regulate stem cell behavior. Therefore, apical hub cells are a critical component of the stem cell niche in the testis. In the course of a screen to identify factors involved in regulating hub maintenance, we identified headcase (hdc). Hub cells depleted for hdc undergo programmed cell death, suggesting that anti-apoptotic pathways play an important role in maintenance of the niche. Using hdc as paradigm, we describe here the first comprehensive analysis on the effects of a progressive niche reduction on the testis stem cell pool. Surprisingly, single hub cells remain capable of supporting numerous stem cells, indicating that although the size and number of niche support cells influence stem cell maintenance, the testis stem cell niche appears to be remarkably robust in the its ability to support stem cells after severe damage.
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