Activated macrophages promote Wnt signalling through tumour necrosis factor-alpha in gastric tumour cells.

ABSTRACT: The activation of Wnt/beta-catenin signalling has an important function in gastrointestinal tumorigenesis. It has been suggested that the promotion of Wnt/beta-catenin activity beyond the threshold is important for carcinogenesis. We herein investigated the role of macrophages in the promotion of Wnt/beta-catenin activity in gastric tumorigenesis. We found beta-catenin nuclear accumulation in macrophage-infiltrated dysplastic mucosa of the K19-Wnt1 mouse stomach. Moreover, macrophage depletion in Apc(Delta716) mice resulted in the suppression of intestinal tumorigenesis. These results suggested the role of macrophages in the activation of Wnt/beta-catenin signalling, which thus leads to tumour development. Importantly, the conditioned medium of activated macrophages promoted Wnt/beta-caten

SUBMITTER: Oguma K 

PROVIDER: S-EPMC2413189 | biostudies-literature | 2008 Jun

REPOSITORIES: biostudies-literature