The Tumor Suppressor Gene, RASSF1A, is Essential for Protection Against Inflammation -induced Injury

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2013 Oct 23

PMID 24146755

Citations 24

Authors

Marilyn Gordon

Mohamed El-Kalla

Yuewen Zhao

Yahya Fiteih

Jennifer Law

Natalia Volodko

Anwar Anwar-Mohamed

Anwar Mohamed

Ayman O S El-Kadi

Lei Liu

Jeff Odenbach

Aducio Thiesen

Christina Onyskiw

Haya Abu Ghazaleh

Jikyoung Park

Sean Bong Lee

Victor C Yu

Carlos Fernandez-Patron

R Todd Alexander

Eytan Wine

Shairaz Baksh

Affiliations

Soon will be listed here.

Abstract

Ras association domain family protein 1A (RASSF1A) is a tumor suppressor gene silenced in cancer. Here we report that RASSF1A is a novel regulator of intestinal inflammation as Rassf1a(+/-) , Rassf1a(-/-) and an intestinal epithelial cell specific knockout mouse (Rassf1a (IEC-KO) ) rapidly became sick following dextran sulphate sodium (DSS) administration, a chemical inducer of colitis. Rassf1a knockout mice displayed clinical symptoms of inflammatory bowel disease including: increased intestinal permeability, enhanced cytokine/chemokine production, elevated nuclear factor of kappa light polypeptide gene enhancer in B-cells (NFκB) activity, elevated colonic cell death and epithelial cell injury. Furthermore, epithelial restitution/repair was inhibited in DSS-treated Rassf1a(-/-) mice with reduction of several makers of proliferation including Yes associated protein (YAP)-driven proliferation. Surprisingly, tyrosine phosphorylation of YAP was detected which coincided with increased nuclear p73 association, Bax-driven epithelial cell death and p53 accumulation resulting in enhanced apoptosis and poor survival of DSS-treated Rassf1a knockout mice. We can inhibit these events and promote the survival of DSS-treated Rassf1a knockout mice with intraperitoneal injection of the c-Abl and c-Abl related protein tyrosine kinase inhibitor, imatinib/gleevec. However, p53 accumulation was not inhibited by imatinib/gleevec in the Rassf1a(-/-) background which revealed the importance of p53-dependent cell death during intestinal inflammation. These observations suggest that tyrosine phosphorylation of YAP (to drive p73 association and up-regulation of pro-apoptotic genes such as Bax) and accumulation of p53 are consequences of inflammation-induced injury in DSS-treated Rassf1a(-/-) mice. Mechanistically, we can detect robust associations of RASSF1A with membrane proximal Toll-like receptor (TLR) components to suggest that RASSF1A may function to interfere and restrict TLR-driven activation of NFκB. Failure to restrict NFκB resulted in the inflammation-induced DNA damage driven tyrosine phosphorylation of YAP, subsequent p53 accumulation and loss of intestinal epithelial homeostasis.

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