Group III phospholipase A2 promotes colitis and colorectal cancer.

Abstract:

:Lipid mediators play pivotal roles in colorectal cancer and colitis, but only a limited member of the phospholipase A2 (PLA2) subtypes, which lie upstream of various lipid mediators, have been implicated in the positive or negative regulation of these diseases. Clinical and biochemical evidence suggests that secreted PLA2 group III (sPLA2-III) is associated with colorectal cancer, although its precise role remains obscure. Here we have found that sPLA2-III-null (Pla2g3 -/-) mice are highly resistant to colon carcinogenesis. Furthermore, Pla2g3 -/- mice are less susceptible to dextran sulfate-induced colitis, implying that the amelioration of colonic inflammation by sPLA2-III ablation may underlie the protective effect against colon cancer. Lipidomics analysis of the colon revealed significant reduction of pro-inflammatory/pro-tumorigenic lysophosholipids as well as unusual steady-state elevation of colon-protective fatty acids and their oxygenated metabolites in Pla2g3 -/- mice. Overall, our results establish a role of sPLA2-III in the promotion of colorectal inflammation and cancer, expand our understanding of the divergent roles of multiple PLA2 enzymes in the gastrointestinal tract, and point to sPLA2-III as a novel druggable target for colorectal diseases.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Murase R,Taketomi Y,Miki Y,Nishito Y,Saito M,Fukami K,Yamamoto K,Murakami M

doi

10.1038/s41598-017-12434-z

subject

Has Abstract

pub_date

2017-09-25 00:00:00

pages

12261

issue

1

issn

2045-2322

pii

10.1038/s41598-017-12434-z

journal_volume

7

pub_type

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