HSF-1 regulators DDL-1/2 link insulin-like signaling to heat-shock responses and modulation of longevity.

HSF-1 regulators DDL-1/2 link insulin-like signaling to heat-shock responses and modulation of longevity.
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DOI:
10.1016/j.cell.2011.12.019
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发表时间:
2012-01-20
期刊:
影响因子:
64.5
通讯作者:
Hsu AL
Hsu AL
中科院分区:
生物学1区
文献类型:
--
作者:
Chiang WC;Ching TT;Lee HC;Mousigian C;Hsu AL

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长寿往往与对各种压力源的抵抗力增强有关。已知胰岛素/IGF-1样信号传导(IIS)在衰老和抗应激的细胞机制中具有保守作用。In C.在线虫中,遗传研究表明热休克转录因子HSF-1是IIS调节寿命所必需的。在这里,我们报告说,HSF-1的活动是由IIS调节。这种调节可能发生在HSF-1激活的早期阶段,通过两种HSF-1调节因子DDL-1和DDL-2进行。抑制hsf-1/2以hsf-1依赖的方式增加寿命和耐热性。此外,生物化学分析表明,HSF-1/2通过与HSF-1形成蛋白质复合物来负调节HSF-1活性。这种复合物(DHIC)的形成受到β-l磷酸化状态的影响。DHIC的形成和DHIC-1的磷酸化均受IIS控制。因此,HSF-1/2可能是IIS和HSF-1通路之间的联系。
Extended longevity is often correlated with increased resistance against various stressors. Insulin/IGF-1-like signaling (IIS) is known to have a conserved role in aging and cellular mechanisms against stress. In C. elegans, genetic studies suggest that heat-shock transcription factor HSF-1 is required for IIS to modulate longevity. Here we report that the activity of HSF-1 is regulated by IIS. This regulation might occur at an early step of HSF-1 activation via two HSF-1 regulators, DDL-1 and DDL-2. Inhibition of DDL-1/2 increases longevity and thermotolerance in an hsf-1 dependent manner. Furthermore, biochemical analyses suggest that DDL-1/2 negatively regulates HSF-1 activity by forming a protein complex with HSF-1. The formation of this complex (DHIC) is affected by the phosphorylation status of DDL-1. Both the formation of DHIC and the phosphorylation of DDL-1 are controlled by IIS. Therefore, DDL-1/2 may serve as the link between IIS and HSF-1 pathway.
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