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ROBO2 is a stroma suppressor gene in the pancreas and acts via TGF-beta signalling

Abstract

Whereas genomic aberrations in the SLIT-ROBO pathway are frequent in pancreatic ductal adenocarcinoma (PDAC), their function in the pancreas is unclear. Here we report that in pancreatitis and PDAC mouse models, epithelial Robo2 expression is lost while Robo1 expression becomes most prominent in the stroma. Cell cultures of mice with loss of epithelial Robo2 (Pdx1(Cre);Robo2(F/F)) show increased activation of Robo1(+) myofibroblasts and induction of TGF-beta and Wnt pathways. During pancreatitis, Pdx1(Cre);Robo2(F/F) mice present enhanced myofibroblast activation, collagen crosslinking, T-cell infiltration and tumorigenic immune markers. The TGF-beta inhibitor galunisertib suppresses these effects. In PDAC patients, ROBO2 expression is overall low while ROBO1 is variably expressed in epithelium and high in stroma. ROBO2(low);ROBO1(high) patients present the poorest survival. In conclusion, Robo2 acts non-autonomously as a stroma suppressor gene by restraining myofibroblast activation and T-cell infiltration. ROBO1/2 expression in PDAC patients may guide therapy with TGF-beta inhibitors or other stroma /immune modulating agents.

Type Journal
ISBN 2041-1723
Authors Pinho, A. V.; Van Bulck, M.; Chantrill, L.; Arshi, M.; Sklyarova, T.; Herrmann, D.; Vennin, C.; Gallego-Ortega, D.; Mawson, A.; Giry-Laterriere, M.; Magenau, A.; Leuckx, G.; Baeyens, L.; Gill, A. J.; Phillips, P.; Timpson, P.; Biankin, A. V.; Wu, J.; Rooman, I.
Publisher Name Nature Communications
Published Date 2018-11-30
Published Volume 9
Published Issue 1
Published Pages 5083
Status Always Electronic
DOI 10.1038/s41467-018-07497-z
URL link to publisher's version https://www.ncbi.nlm.nih.gov/pubmed/30504844
OpenAccess link to author's accepted manuscript version https://publications.gimr.garvan.org.au/open-access/14851