miR-17 extends mouse lifespan by inhibiting senescence signaling mediated by MKP7.

miR-17 extends mouse lifespan by inhibiting senescence signaling mediated by MKP7.
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DOI:
10.1038/cddis.2014.305
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发表时间:
2014-07-31
影响因子:
9
通讯作者:
Yang, B. B.
Yang, B. B.
中科院分区:
生物学1区
文献类型:
--
作者:
Du, W. W.;Yang, W.;Fang, L.;Xuan, J.;Li, H.;Khorshidi, A.;Gupta, S.;Li, X.;Yang, B. B.

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在这里,我们表明,转基因表达的miR-17延长寿命和抑制细胞衰老。我们认为miR-17是细胞衰老和肿瘤发生的关键调节因子。我们证明miR-17同时靶向ADCY 5和IRS 1,上调下游信号MKP 7、FoxO 3、LC 3B和HIF 1 α,下调mTOR、c-myc、cyclin D1和JNK。沉默ADCY 5或IRS 1促进自噬并抑制细胞衰老和凋亡。miR-17对ADCY 5的抑制使膜结合的RGS 2易位到细胞核中,促进RGS 2与HIF 1 α和MKP 7启动子的相互作用,增强MKP 7转录。miR-17对ADCY 5的抑制也促进了EGFR和MKP 7从细胞膜易位到细胞质和线粒体组分中。重要的是,我们发现MKP 7通过使PRAS 40在Thr 246处去磷酸化和mTOR在Ser 2248处去磷酸化来抑制衰老,促进两种分子的相互作用和功能丧失。因此,致癌miR-17还多效性地起作用以抑制细胞衰老并延长寿命。
Here we show that transgenic expression of miR-17 extends lifespan and inhibits cellular senescence. We propose that miR-17 acts as a critical regulator of cellular senescence and tumorigenesis. We demonstrate that miR-17 targets both ADCY5 and IRS1, upregulating the downstream signals MKP7, FoxO3, LC3B, and HIF1α, and downregulating mTOR, c-myc, cyclin D1, and JNK. Silencing either ADCY5 or IRS1 promoted autophagy and repressed cellular senescence and apoptosis. Repression of ADCY5 by miR-17 translocated membrane-bound RGS2 into the nucleus, promoting interactions of RGS2 with HIF1α and the MKP7 promoter, enhancing MKP7 transcription. ADCY5 repression by miR-17 also facilitated the translocation of EGFR and MKP7 from membrane into cytoplasmic and mitochondrial fractions. Importantly, we found that MKP7 inhibited senescence by dephosphorylating PRAS40 at Thr246 and mTOR at Ser2248, facilitating the interaction and loss of function of both molecules. Thus, the oncogenic miR-17 also acts pleiotropically to inhibit cellular senescence and extend longevity.
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