Abstract
Senescence, perceived as a cancer barrier, is paradoxically associated with inflammation, which promotes tumorigenesis. Here, we characterize a distinct low-grade inflammatory process in stressed epithelium that is related to para-inflammation; this process either represses or promotes tumorigenesis, depending on p53 activity. Csnk1a1 (CKIα) downregulation induces a senescence-associated inflammatory response (SIR) with growth arrest in colorectal tumors, which loses its growth control capacity in the absence of p53 and instead, accelerates growth and invasiveness. Corresponding processes occur in CKIα-deleted intestinal organoids, assuming tumorigenic transformation properties exvivo, upon p53 loss. Treatment of organoids and mice with anti-inflammatory agents suppresses the SIR and prevents p53-deficient organoid transformation and mouse carcinogenesis. SIR/para-inflammation suppression may therefore constitute a key mechanism in the anticarcinogenic effects of nonsteroidal anti-inflammatory drugs.
Original language | English |
---|---|
Pages (from-to) | 242-256 |
Number of pages | 15 |
Journal | Cancer Cell |
Volume | 24 |
Issue number | 2 |
DOIs | |
State | Published - 12 Aug 2013 |
Bibliographical note
Funding Information:This work was supported by grants from the Israel Science Foundation-Centers of Excellence, the European Research Council within the FP-7: LIVERMICROENV (to E.P.), P73CANCER (to T.S.), and PICHO (to Y.B.-N.); the Dr. Miriam and Sheldon G. Adelson Medical Research Foundation; the I-CORE program of ISF (grant no. 41/11); the Israel Cancer Research fund; the Alvarez Family award; the Cooperation Program in Cancer Research of the Deutsches Krebsforschungszentrum; the ERC Marie Curie Program and the Sigrid Juselius Foundation (to Z.W. and K.A.); and Israeli’s Ministry of Science, Culture and Sport. We thank Eva and George Klein for helpful insights clarifying our thoughts and terminology.