p63 mediates an apoptotic response to pharmacological and disease-related ER stress in the developing epidermis.

p63 mediates an apoptotic response to pharmacological and disease-related ER stress in the developing epidermis.
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DOI:
10.1016/j.devcel.2011.07.012
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发表时间:
2011-09-13
期刊:
影响因子:
11.8
通讯作者:
Look, A. Thomas
Look, A. Thomas
中科院分区:
生物学1区
文献类型:
--
作者:
Pyati, Ujwal J.;Gjini, Evisa;Carbonneau, Seth;Lee, Jeong-Soo;Guo, Feng;Jette, Cicely A.;Kelsell, David P.;Look, A. Thomas

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内质网(ER)应激触发组织特异性反应,最终导致细胞适应或凋亡,但区分这些反应的遗传网络尚不清楚。本研究表明,内质网应激在发育中的斑马鱼中引起脑、脊髓、尾表皮、晶状体和骨骺的快速凋亡。聚焦于尾表皮,我们发现了一种依赖于Puma而不是p53或Chop的凋亡反应。在内质网应激反应中,Puma以不依赖p53的方式被转录激活,是表皮细胞凋亡的重要介质。我们证明p63转录因子上调启动这一凋亡途径,并在内质网应激下直接激活puma转录。我们还发现,在斑马鱼胚胎中,导致红角化皮病变异性的人连接蛋白31突变可诱导内质网应激和p63依赖性表皮细胞凋亡,从而暗示该途径与遗传性疾病的发病机制有关。
Endoplasmic reticulum (ER) stress triggers tissue-specific responses that culminate in either cellular adaptation or apoptosis, but the genetic networks distinguishing these responses are not well understood. Here we demonstrate that ER stress induced in the developing zebrafish causes rapid apoptosis in the brain, spinal cord, tail epidermis, lens and epiphysis. Focusing on the tail epidermis, we uncover an apoptotic response that depends on Puma, but not on p53 or Chop. Puma is transcriptionally activated during this ER stress response in a p53-independent manner, and is an essential mediator of epidermal apoptosis. We demonstrate that the p63 transcription factor is upregulated to initiate this apoptotic pathway and directly activates puma transcription in response to ER stress. We also show that a mutation of human Connexin 31, which causes erythrokeratoderma variabilis, induces ER stress and p63-dependent epidermal apoptosis in the zebrafish embryo, thus implicating this pathway in the pathogenesis of inherited disease.
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