A yeast MAPK cascade regulates pexophagy but not other autophagy pathways.

A yeast MAPK cascade regulates pexophagy but not other autophagy pathways.
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DOI:
10.1083/jcb.200909154
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发表时间:
2010-04-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Subramani S
Subramani S
中科院分区:
其他
文献类型:
--
作者:
Manjithaya R;Jain S;Farré JC;Subramani S

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色葡萄酿酒酵母Slt2p MAPK级联挑选过氧化物酶体用于自噬介导的降解(pexophagy),但不参与其他细胞组分的周转。自噬对于许多细胞过程如先天免疫、神经变性、衰老和癌症是重要的。虽然已经研究了触发自噬的信号事件,但关于自噬被重定向以实现选择性去除细胞组分的信号机制知之甚少。我们已经使用过氧化物酶体标记物的降解来研究蛋白激酶在酿酒酵母中过氧化物酶体的选择性自噬(pexophagy)中的作用。我们发现,Slt2p丝裂原活化蛋白激酶(MAPK)和它的信号转导通路的几个上游组件是必要的pexophagy,但不是pexophagosome形成或其他非选择性和选择性形式的自噬。其他激活该通路的细胞外信号本身不会触发pexophagy,这表明这种MAPK级联是必要的,但不足以触发pexophagy。我们认为,pexophagy需要同时激活MAPK通路和己糖传感机制,通过蛋白激酶A和环磷酸腺苷。
The S. cerevisiae Slt2p MAPK cascade picks out peroxisomes for autophagy-mediated degradation (pexophagy) but is not involved in turnover of other cellular components. Autophagy is important for many cellular processes such as innate immunity, neurodegeneration, aging, and cancer. Although the signaling events triggering autophagy have been studied, little is known regarding the signaling mechanisms by which autophagy is redirected to achieve selective removal of cellular components. We have used the degradation of a peroxisomal marker to investigate the role of protein kinases in selective autophagy of peroxisomes (pexophagy) in Saccharomyces cerevisiae. We show that the Slt2p mitogen-activated protein kinase (MAPK) and several upstream components of its signal transduction pathway are necessary for pexophagy but not for pexophagosome formation or other nonselective and selective forms of autophagy. Other extracellular signals that activate this pathway do not trigger pexophagy on their own, suggesting that this MAPK cascade is necessary but not sufficient to trigger pexophagy. We propose that pexophagy requires the simultaneous activation of this MAPK pathway and a hexose-sensing mechanism acting through protein kinase A and cyclic adenosine monophosphate.
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