title: Netrin-1 up-regulation in inflammatory bowel diseases is required for colorectal cancer progression.
abstract: Chronic inflammation and cancer are intimately associated. This is particularly true for inflammatory bowel diseases (IBD), such as ulcerative colitis and Crohn's disease, which show a major increased risk for colorectal cancer. While the understanding of the molecular pathogenesis of IBD has recently improved, the mechanisms that link these chronic inflammatory states to colorectal cancer development are in large part unknown. One of these mechanisms is NF-kappaB pathway activation which in turn may contribute to tumor formation by providing anti-apoptotic survival signals to the epithelial cells. Based on the observation that netrin-1, the anti-apoptotic ligand for the dependence receptors DCC and UNC5H is up-regulated in colonic crypts in response to NF-kappaB, we show here that colorectal cancers from inflammatory bowel diseases patients have selected up-regulation of netrin-1. Moreover, we demonstrate that this inflammation-driven netrin-1 up-regulation is causal for colorectal cancer development as interference with netrin-1 autocrine loop in a mouse model for ulcerative colitis-associated colorectal cancer, while showing no effect on inflammation, inhibits colorectal cancer progression.
authors.affiliation: Apoptosis, Cancer and Development Laboratory-Equipe labellisée La Ligue, Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5238, Université de Lyon, Centre Léon Bérard, 69008 Lyon, France.
authors.forename: Andrea
authors.initials: A
authors.lastname: Paradisi
authors.forename: Carine
authors.initials: C
authors.lastname: Maisse
authors.forename: Marie-May
authors.initials: MM
authors.lastname: Coissieux
authors.forename: Nicolas
authors.initials: N
authors.lastname: Gadot
authors.forename: Florian
authors.initials: F
authors.lastname: Lépinasse
authors.forename: Céline
authors.initials: C
authors.lastname: Delloye-Bourgeois
authors.forename: Jean-Guy
authors.initials: JG
authors.lastname: Delcros
authors.forename: Magali
authors.initials: M
authors.lastname: Svrcek
authors.forename: Clemens
authors.initials: C
authors.lastname: Neufert
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Fléjou
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Scoazec
authors.forename: Patrick
authors.initials: P
authors.lastname: Mehlen
mesh_terms: D000818:Animals; D017209:Apoptosis; D053148:Caspase 3 / Q000378:metabolism; D002460:Cell Line; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D018450:Disease Progression; D005260:Female; D045325:HCT116 Cells; D019073:HT29 Cells; D006801:Humans; D007150:Immunohistochemistry; D015212:Inflammatory Bowel Diseases / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D016328:NF-kappa B / Q000378:metabolism; D009414:Nerve Growth Factors / Q000235:genetics* / Q000378:metabolism; D000075388:Netrin-1; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D025521:Tumor Suppressor Proteins / Q000235:genetics* / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D016328:NF-kappa B; C000617351:NTN1 protein, human; D009414:Nerve Growth Factors; C000617353:Ntn1 protein, mouse; D025521:Tumor Suppressor Proteins; D000075388:Netrin-1; D053148:Caspase 3