Fork head controls the timing and tissue selectivity of steroid-induced developmental cell death.

Fork head controls the timing and tissue selectivity of steroid-induced developmental cell death.
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DOI:
10.1083/jcb.200611155
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发表时间:
2007-03-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Lehmann M
Lehmann M
中科院分区:
其他
文献类型:
--
作者:
Cao C;Liu Y;Lehmann M

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果蝇变态过程中的细胞死亡由类固醇激素 20-羟基蜕皮酮 (20E) 控制。触发死亡的信号通路的元件是已知的,但尚不清楚为什么一些组织而不是其他组织会响应特定的激素脉冲而死亡。我们发现,组织特异性转录因子叉头 (Fkh) 的丧失对于指定幼虫唾液腺中对 20E 的死亡反应来说是必需的,也是足够的。 fkh 本身的丧失是类固醇控制的事件,由 20E 诱导的 BR-C 基因介导,并使关键的死亡调节因子 hid 和 reaper 激素产生反应。这些结果表明黑腹果蝇 FOXA 直系同源物 Fkh 具有作为类固醇控制的细胞死亡的能力因子的新功能。他们解释了如何挑选出特定的组织进行死亡,以及为什么该组织能够在早期的激素脉冲中幸存下来。更一般地说,他们认为 Fkh 等细胞识别因子在发育细胞死亡的正常控制中发挥着关键作用。
Cell death during Drosophila melanogaster metamorphosis is controlled by the steroid hormone 20-hydroxyecdysone (20E). Elements of the signaling pathway that triggers death are known, but it is not known why some tissues, and not others, die in response to a particular hormone pulse. We found that loss of the tissue-specific transcription factor Fork head (Fkh) is both required and sufficient to specify a death response to 20E in the larval salivary glands. Loss of fkh itself is a steroid-controlled event that is mediated by the 20E-induced BR-C gene, and that renders the key death regulators hid and reaper hormone responsive. These results implicate the D. melanogaster FOXA orthologue Fkh with a novel function as a competence factor for steroid-controlled cell death. They explain how a specific tissue is singled out for death, and why this tissue survives earlier hormone pulses. More generally, they suggest that cell identity factors like Fkh play a pivotal role in the normal control of developmental cell death.
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