ROR1 sustains caveolae and survival signalling as a scaffold of cavin-1 and caveolin-1

Tomoya Yamaguchi, Can Lu, Lisa Ida, Kiyoshi Yanagisawa, Jiro Usukura, Jinglei Cheng, Naoe Hotta, Yukako Shimada, Hisanori Isomura, Motoshi Suzuki, Toyoshi Fujimoto and Takashi Takahashi ()
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Tomoya Yamaguchi: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Can Lu: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Lisa Ida: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Kiyoshi Yanagisawa: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Jiro Usukura: EcoTopia Science Institute, Nagoya University
Jinglei Cheng: Nagoya University Graduate School of Medicine
Naoe Hotta: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Yukako Shimada: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Hisanori Isomura: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Motoshi Suzuki: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine
Toyoshi Fujimoto: Nagoya University Graduate School of Medicine
Takashi Takahashi: Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine

Nature Communications, 2016, vol. 7, issue 1, 1-13

Abstract: Abstract The receptor tyrosine kinase-like orphan receptor 1 (ROR1) sustains prosurvival signalling directly downstream of the lineage-survival oncogene NKX2-1/TTF-1 in lung adenocarcinoma. Here we report an unanticipated function of this receptor tyrosine kinase (RTK) as a scaffold of cavin-1 and caveolin-1 (CAV1), two essential structural components of caveolae. This kinase-independent function of ROR1 facilitates the interactions of cavin-1 and CAV1 at the plasma membrane, thereby preventing the lysosomal degradation of CAV1. Caveolae structures and prosurvival signalling towards AKT through multiple RTKs are consequently sustained. These findings provide mechanistic insight into how ROR1 inhibition can overcome EGFR–tyrosine kinase inhibitor (TKI) resistance due to bypass signalling via diverse RTKs such as MET and IGF-IR, which is currently a major clinical obstacle. Considering its onco-embryonic expression, inhibition of the scaffold function of ROR1 in patients with lung adenocarcinoma is an attractive approach for improved treatment of this devastating cancer.

Date: 2016
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DOI: 10.1038/ncomms10060

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