The ubiquitin-specific protease USP2a prevents endocytosis-mediated EGFR degradation.
The ubiquitin-specific protease USP2a prevents endocytosis-mediated EGFR degradation.
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DOI:
10.1038/onc.2012.188
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发表时间:
2013-03-28
期刊:
影响因子:
8
通讯作者:
Loda, M.
中科院分区:
文献类型:
--
作者:
Liu, Z.;Zanata, S. M.;Kim, J.;Peterson, M. A.;Di Vizio, D.;Chirieac, L. R.;Pyne, S.;Agostini, M.;Freeman, M. R.;Loda, M.
Ubiquitination of EGFR is required for down-regulation of the receptor by endocytosis. Impairment of this pathway results in constitutively active EGFR, which is associated with carcinogenesis, particularly in lung cancer. We previously demonstrated that the deubiquitinating enzyme USP2a has oncogenic properties. Here we show a new role for USP2a as a regulator of EGFR endocytosis. USP2a localizes to early endosomes and associates with EGFR, stabilizing the receptor, which retains active downstream signaling. HeLa cells transiently expressing catalytically active but not mutant USP2a show increased plasma membrane-localized EGFR, as well as decreased internalized and ubiquitinated EGFR. Conversely, USP2a silencing reverses this phenotype. Importantly, USP2a prevents the degradation of mutant in addition to wild type EGFR. Finally, we observed that USP2a and EGFR proteins are coordinately over-expressed in non-small cell lung cancers. Taken together, our data indicate that USP2a antagonizes EGFR endocytosis and thus amplifies signaling activity from the receptor. Our findings suggest that regulation of deubiquitination could be exploited therapeutically in cancers over-expressing EGFR.
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