西亚试剂：A Senescence-Inflammatory Switch from Cancer-Inhibitory to

A Senescence-Inflammatory Switch from Cancer-Inhibitory to Cancer-Promoting  Mechanism

Ariel Pribluda, Ela Elyada, Zoltan Wiener, Haya Hamza, Robert E. Goldstein, Moshe Biton, Ido Burstain,Yael Morgenstern, Guy Brachya, Hana Billauer, Sharon Biton, Irit Snir-Alkalay, Domagoj Vucic, Katharina Schlereth,Marco Mernberger, Thorsten Stiewe, Moshe Oren, Kari Alitalo, Eli Pikarsky and Yinon Ben-Neriah

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 ex vivo, 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.

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