Article (Scientific journals)
Identification of a microRNA landscape targeting the PI3K/Akt signaling pathway in inflammation-induced colorectal carcinogenesis
JOSSE, Claire; Bouznad, Nassim; Geurts, Pierre et al.
2014In American Journal of Physiology - Gastrointestinal and Liver Physiology, 306, p. 229-43
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Abstract :
[en] Inflammation can contribute to tumor formation; however, markers that predict progression are still lacking. In the present study, the well-established azoxymethane (AOM)/dextran sulfate sodium (DSS)-induced mouse model of colitis-associated cancer was used to analyze microRNA (miRNA) modulation accompanying inflammation-induced tumor development and to determine whether inflammation-triggered miRNA alterations affect the expression of genes or pathways involved in cancer. A miRNA microarray experiment was performed to establish miRNA expression profiles in mouse colon at early and late time points during inflammation and/or tumor growth. Chronic inflammation and carcinogenesis were associated with distinct changes in miRNA expression. Nevertheless, prediction algorithms of miRNA-mRNA interactions and computational analyses based on ranked miRNA lists consistently identified putative target genes that play essential roles in tumor growth or that belong to key carcinogenesis-related signaling pathways. We identified PI3K/Akt and the insulin growth factor-1 (IGF-1) as major pathways being affected in the AOM/DSS model. DSS-induced chronic inflammation downregulates miR-133a and miR-143/145, which is reportedly associated with human colorectal cancer and PI3K/Akt activation. Accordingly, conditioned medium from inflammatory cells decreases the expression of these miRNA in colorectal adenocarcinoma Caco-2 cells. Overexpression of miR-223, one of the main miRNA showing strong upregulation during AOM/DSS tumor growth, inhibited Akt phosphorylation and IGF-1R expression in these cells. Cell sorting from mouse colons delineated distinct miRNA expression patterns in epithelial and myeloid cells during the periods preceding and spanning tumor growth. Hence, cell-type-specific miRNA dysregulation and subsequent PI3K/Akt activation may be involved in the transition from intestinal inflammation to cancer.
Disciplines :
Oncology
Author, co-author :
JOSSE, Claire  ;  Centre Hospitalier Universitaire de Liège - CHU > Oncologie médicale
Bouznad, Nassim ;  Université de Liège - ULiège > Département des Sciences Biomédicales et Précliniques > GIGA-R: Génétique Humaine, Laboratoire de Thrombose Hémostase
Geurts, Pierre ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Algorith. des syst. en interaction avec le monde physique
Irrthum, Alexandre ;  Université de Liège - ULiège > Département d'électricité, électronique et informatique
Huynh-Thu, Vân Anh ;  Université de Liège - ULiège > GIGA-Management : Coordination ALMA-GRID
Servais, Laurence ;  Université de Liège - ULiège > Département des Sciences Biomédicales et Précliniques > GIGA-R: Génétique Humaine, Laboratoire de Thrombose Hémostase > GIGA - Membres
Hego, Alexandre ;  Université de Liège - ULiège > Département des Sciences Biomédicales et Précliniques > GIGA-R : Génétique Humaine, Laboratoire de Thrombose Hémostase
Delvenne, Philippe ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Anatomie et cytologie pathologiques
Bours, Vincent ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > GIGA-R : Génétique humaine
Oury, Cécile  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > GIGA-R : Génétique humaine, Laboratoire de Thrombose Hémostase
Language :
English
Title :
Identification of a microRNA landscape targeting the PI3K/Akt signaling pathway in inflammation-induced colorectal carcinogenesis
Publication date :
2014
Journal title :
American Journal of Physiology - Gastrointestinal and Liver Physiology
ISSN :
0193-1857
eISSN :
1522-1547
Publisher :
American Physiological Society
Volume :
306
Pages :
G229-43
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 March 2014

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