Temporal regulation of Drosophila IAP1 determines caspase functions in sensory organ development.

Temporal regulation of Drosophila IAP1 determines caspase functions in sensory organ development.
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果蝇 IAP1 的时间调节决定了感觉器官发育中的 caspase 功能。

DOI:
10.1083/jcb.200905110
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发表时间:
2009-10-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Miura M
Miura M
中科院分区:
其他
文献类型:
--
作者:
Koto A;Kuranaga E;Miura M

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Caspase activation is regulated by the turnover of E3 ubiquitin ligase, DIAP1, and depends on cell type and maturity. The caspases comprise a family of cysteine proteases that function in various cellular processes, including apoptosis. However, how the balance is struck between the caspases’ role in cell death and their nonapoptotic functions is unclear. To address this issue, we monitored the protein turnover of an endogenous caspase inhibitor, Drosophila IAP1 (DIAP1). DIAP1 is an E3 ubiquitin ligase that promotes the ubiquitination of caspases and thereby prevents caspase activation. For this study, we developed a fluorescent probe to monitor DIAP1 turnover in the external sensory organ precursor (SOP) lineage of living Drosophila. The SOP divides asymmetrically to make the shaft, socket, and sheath cells, and the neuron that comprise each sensory organ. We found that the quantity of DIAP1 changed dramatically depending on the cell type and maturity, and that the temporal regulation of DIAP1 turnover determines whether caspases function nonapoptotically in cellular morphogenesis or cause cell death.
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