Functional antagonism between CagA and DLC1 in gastric cancer

Isabel Hinsenkamp, Jan P. Köhler, Christoph Flächsenhaar, Ivana Hitkova, Sabine Eberhart Meessen, Timo Gaiser, Thomas Wieland, Christel Weiss, Christoph Röcken, Michael Mowat, Michael Quante, Karin Taxauer, Raquel Mejias-Luque, Markus Gerhard, Roger Vogelmann, Nadja Meindl-Beinker, Matthias Ebert, Elke Burgermeister

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Helicobacter (H.) pylori-induced gastritis is a risk factor for gastric cancer (GC). Deleted-in-liver-cancer-1 (DLC1/ARHGAP7) inhibits RHOA, a downstream mediator of virulence factor cytotoxin-A (CagA) signalling and driver of consensus-molecular-subtype-2 diffuse GC. DLC1 located to enterochromaffin-like and MIST1+ stem/chief cells in the stomach. DLC1+ cells were reduced in H. pylori gastritis and GC, and in mice infected with H. pylori. DLC1 positivity inversely correlated with tumour progression in patients. GC cells retained an N-terminal truncation variant DLC1v4 in contrast to full-length DLC1v1 in non-neoplastic tissues. H. pylori and CagA downregulated DLC1v1/4 promoter activities. DLC1v1/4 inhibited cell migration and counteracted CagA-driven stress phenotypes enforcing focal adhesion. CagA and DLC1 interacted via their N- and C-terminal domains, proposing that DLC1 protects against H. pylori by neutralising CagA. H. pylori-induced DLC1 loss is an early molecular event, which makes it a potential marker or target for subtype-aware cancer prevention or therapy.

Original languageEnglish
Article number358
JournalCell Death Discovery
Volume8
Issue number1
DOIs
StatePublished - Dec 2022

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