The tumour suppressor OPCML promotes AXL inactivation by the phosphatase PTPRG in ovarian cancer

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Title: The tumour suppressor OPCML promotes AXL inactivation by the phosphatase PTPRG in ovarian cancer
Authors: Antony, J
Zanini, E
Kelly, Z
Tan, TZ
Karali, E
Alomary, M
Jung, Y
Nixon, K
Cunnea, P
Fotopoulou, C
Paterson, A
Roy-Nawathe, S
Mills, GB
Huang, RY-J
Thiery, JP
Gabra, H
Recchi, C
Item Type: Journal Article
Abstract: In ovarian cancer, the prometastatic RTK AXL promotes motility, invasion and poor prognosis. Here, we show that reduced survival caused by AXL overexpression can be mitigated by the expression of the GPI-anchored tumour suppressor OPCML Further, we demonstrate that AXL directly interacts with OPCML, preferentially so when AXL is activated by its ligand Gas6. As a consequence, AXL accumulates in cholesterol-rich lipid domains, where OPCML resides. Here, phospho-AXL is brought in proximity to the lipid domain-restricted phosphatase PTPRG, which de-phosphorylates the RTK/ligand complex. This prevents AXL-mediated transactivation of other RTKs (cMET and EGFR), thereby inhibiting sustained phospho-ERK signalling, induction of the EMT transcription factor Slug, cell migration and invasion. From a translational perspective, we show that OPCML enhances the effect of the phase II AXL inhibitor R428 in vitro and in vivo We therefore identify a novel mechanism by which two spatially restricted tumour suppressors, OPCML and PTPRG, coordinate to repress AXL-dependent oncogenic signalling.
Issue Date: 15-Jun-2018
Date of Acceptance: 23-May-2018
ISSN: 1469-221X
Publisher: EMBO Press
Journal / Book Title: EMBO Reports
Copyright Statement: © 2018 The Authors
Keywords: AXL
ovarian cancer
0601 Biochemistry And Cell Biology
Developmental Biology
Publication Status: Published online
Conference Place: England
Article Number: e45670
Online Publication Date: 2018-06-15
Appears in Collections:Division of Surgery
Division of Cancer
Faculty of Medicine

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