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Cancer cell adaptation to hypoxia involves a HIF-GPRC5A-YAP axis
Authors
Clare Bagley
Mark Bond
+10 more
Tracey J Collard
David Gay
Alexander Greenhough
David B Gurevich
Kate J Heesom
Karim Malik
Paul Martin
Chris Paraskeva
Owen J Sansom
Ann C Williams
Publication date
1 November 2018
Publisher
'EMBO'
Doi
Cite
Abstract
© 2018 The Authors. Published under the terms of the CC BY 4.0 license Hypoxia is a hallmark of solid tumours and a key physiological feature distinguishing cancer from normal tissue. However, a major challenge remains in identifying tractable molecular targets that hypoxic cancer cells depend on for survival. Here, we used SILAC-based proteomics to identify the orphan G protein-coupled receptor GPRC5A as a novel hypoxia-induced protein that functions to protect cancer cells from apoptosis during oxygen deprivation. Using genetic approaches invitro and invivo, we reveal HIFs as direct activators of GPRC5A transcription. Furthermore, we find that GPRC5A is upregulated in the colonic epithelium of patients with mesenteric ischaemia, and in colorectal cancers high GPRC5A correlates with hypoxia gene signatures and poor clinical outcomes. Mechanistically, we show that GPRC5A enables hypoxic cell survival by activating the Hippo pathway effector YAP and its anti-apoptotic target gene BCL2L1. Importantly, we show that the apoptosis induced by GPRC5A depletion in hypoxia can be rescued by constitutively active YAP. Our study identifies a novel HIF-GPRC5A-YAP axis as a critical mediator of the hypoxia-induced adaptive response and a potential target for cancer therapy
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