BVES regulates c-Myc stability via PP2A and suppresses colitis-induced tumourigenesis.

Abstract:

OBJECTIVE:Blood vessel epicardial substance (BVES) is a tight junction-associated protein that regulates epithelial-mesenchymal states and is underexpressed in epithelial malignancy. However, the functional impact of BVES loss on tumourigenesis is unknown. Here we define the in vivo role of BVES in colitis-associated cancer (CAC), its cellular function and its relevance to patients with IBD. DESIGN:We determined BVES promoter methylation status using an Infinium HumanMethylation450 array screen of patients with UC with and without CAC. We also measured BVES mRNA levels in a tissue microarray consisting of normal colons and CAC samples. Bves-/- and wild-type mice (controls) were administered azoxymethane (AOM) and dextran sodium sulfate (DSS) to induce tumour formation. Last, we used a yeast two-hybrid screen to identify BVES interactors and performed mechanistic studies in multiple cell lines to define how BVES reduces c-Myc levels. RESULTS:BVES mRNA was reduced in tumours from patients with CAC via promoter hypermethylation. Importantly, BVES promoter hypermethylation was concurrently present in distant non-malignant-appearing mucosa. As seen in human patients, Bves was underexpressed in experimental inflammatory carcinogenesis, and Bves-/- mice had increased tumour multiplicity and degree of dysplasia after AOM/DSS administration. Molecular analysis of Bves-/- tumours revealed Wnt activation and increased c-Myc levels. Mechanistically, we identified a new signalling pathway whereby BVES interacts with PR61α, a protein phosphatase 2A regulatory subunit, to mediate c-Myc destruction. CONCLUSION:Loss of BVES promotes inflammatory tumourigenesis through dysregulation of Wnt signalling and the oncogene c-Myc. BVES promoter methylation status may serve as a CAC biomarker.

journal_name

Gut

journal_title

Gut

authors

Parang B,Kaz AM,Barrett CW,Short SP,Ning W,Keating CE,Mittal MK,Naik RD,Washington MK,Revetta FL,Smith JJ,Chen X,Wilson KT,Brand T,Bader DM,Tansey WP,Chen R,Brentnall TA,Grady WM,Williams CS

doi

10.1136/gutjnl-2015-310255

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

852-862

issue

5

eissn

0017-5749

issn

1468-3288

pii

gutjnl-2015-310255

journal_volume

66

pub_type

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