Nutrient-induced FNIP degradation by SCFβ-TRCP regulates FLCN complex localization and promotes renal cancer progression

Katsuyuki Nagashima, Hidefumi Fukushima, Kouhei Shimizu, Aya Yamada, Masumi Hidaka, Hisashi Hasumi, Tetsuro Ikebe, Satoshi Fukumoto, Koji Okabe, Hiroyuki Inuzuka

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

Folliculin-interacting protein 1 and 2 (FNIP1 and FNIP2) play critical roles in preventing renal malignancy through their association with the tumor suppressor FLCN. Mutations in FLCN are associated with Birt-Hogg-Dubé (BHD) syndrome, a rare disorder with increased risk of renal cancer. Recent studies indicated that FNIP1/FNIP2 double knockout mice display enlarged polycystic kidneys and renal carcinoma, which phenocopies FLCN knockout mice, suggesting that these two proteins function together to suppress renal cancer. However, the molecular mechanism functionally linking FNIP1/FNIP2 and FLCN remains largely elusive. Here, we demonstrated that FNIP2 protein is unstable and subjected to proteasome-dependent degradation via β-TRCP and Casein Kinase 1 (CK1)-directed ubiquitination in a nutrition-dependent manner. Degradation of FNIP2 leads to lysosomal dissociation of FLCN and subsequent lysosomal association of mTOR, which in turn promotes the proliferation of renal cancer cells. These results indicate that SCFβ-TRCP negatively regulates the FLCN complex by promoting FNIP degradation and provide molecular insight into the pathogenesis of BHD-associated renal cancer.

本文言語英語
ページ(範囲)9947-9960
ページ数14
ジャーナルOncotarget
8
6
DOI
出版ステータス出版済み - 2017
外部発表はい

All Science Journal Classification (ASJC) codes

  • Oncology

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