A kinase-independent role for EGF receptor in autophagy initiation.

A kinase-independent role for EGF receptor in autophagy initiation.
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DOI:
10.1016/j.cell.2014.12.006
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发表时间:
2015-01-15
期刊:
影响因子:
64.5
通讯作者:
Anderson RA
Anderson RA
中科院分区:
生物学1区
文献类型:
--
作者:
Tan X;Thapa N;Sun Y;Anderson RA

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The Epidermal Growth Factor Receptor (EGFR) is upregulated in numerous human cancers. Inhibition of EGFR signaling induces autophagy in tumor cells. Here we report an unanticipated role for the inactive EGFR in autophagy initiation. Inactive EGFR interacts with the oncoprotein LAPTM4B that is required for the endosomal accumulation of EGFR upon serum starvation. Inactive EGFR and LAPTM4B stabilize each other at endosomes and recruit the exocyst subcomplex containing Sec5. We show that inactive EGFR, LAPTM4B, and the Sec5 subcomplex are required for basal and starvation induced autophagy. LAPTM4B and Sec5 promote EGFR association with the autophagy inhibitor Rubicon, which in turn disassociates Beclin 1 from Rubicon to initiate autophagy. Thus, the oncoprotein LAPTM4B facilitates the role of inactive EGFR in autophagy initiation. This pathway is positioned to control tumor metabolism and promote tumor cell survival upon serum deprivation or metabolic stress.
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