A PP2A regulatory subunit regulates C. elegans insulin/IGF-1 signaling by modulating AKT-1 phosphorylation.

A PP2A regulatory subunit regulates C. elegans insulin/IGF-1 signaling by modulating AKT-1 phosphorylation.
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DOI:
10.1016/j.cell.2009.01.025
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发表时间:
2009-03-06
期刊:
影响因子:
64.5
通讯作者:
Tissenbaum HA
Tissenbaum HA
中科院分区:
生物学1区
文献类型:
--
作者:
Padmanabhan S;Mukhopadhyay A;Narasimhan SD;Tesz G;Czech MP;Tissenbaum HA

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梭胰岛素/胰岛素样生长因子-1(insulin/IGF-1)信号级联(insulin/IGF-1 signaling cascade,IIS)在线虫的寿命、滞育、代谢和应激反应的调节中起着重要作用。IIS的主要调节控制是通过丝氨酸/苏氨酸特异性蛋白激酶对其组分的磷酸化。在对抗IIS途径中激酶的作用的丝氨酸/苏氨酸蛋白磷酸酶的RNAi筛选中,我们鉴定了PP2A全酶的B56调节亚基pptr-1。pptr-1的调节影响与IIS途径相关的表型,包括寿命、dauer、应激抗性和脂肪储存。我们发现PPTR-1通过调节蠕虫AKT-1在Thr 350的磷酸化而发挥作用。在3T3-L1脂肪细胞中,哺乳动物B56 β以惊人的保守性调节Akt在Thr 308处的磷酸化。in C. elegans中,这种调节最终导致叉头转录因子β 16的亚细胞定位和转录活性的变化。这项研究揭示了B56调节亚基在通过AKT去磷酸化调节胰岛素信号传导中的保守作用,从而在癌症和糖尿病研究中具有广泛的意义。
The C. elegans insulin/IGF-1 signaling (IIS) cascade plays a central role in the regulation of lifespan, dauer diapause, metabolism and stress response. The major regulatory control of IIS is through phosphorylation of its components by serine/threonine-specific protein kinases. In a RNAi screen for serine/threonine protein phosphatases that counter-balance the effect of the kinases in the IIS pathway, we identified pptr-1, a B56 regulatory subunit of the PP2A holoenzyme. Modulation of pptr-1 affects phenotypes associated with the IIS pathway including lifespan, dauer, stress resistance and fat storage. We show that PPTR-1 functions by regulating worm AKT-1 phosphorylation at Thr 350. With striking conservation, mammalian B56β regulates Akt phosphorylation at Thr 308 in 3T3-L1 adipocytes. In C. elegans, this modulation ultimately leads to changes in subcellular localization and transcriptional activity of the forkhead transcription factor DAF-16. This study reveals a conserved role for the B56 regulatory subunit in modulating insulin signaling through AKT dephosphorylation and thereby has widespread implications in cancer and diabetes research.
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