Arachidonic acid suppresses hepatic cell growth through ROS-mediated activation of transglutaminase.

ABSTRACT: We previously reported a profound augmentation in the hepatic levels of a pro-inflammatory precursor, arachidonic acid (AA), during liver tumorigenesis. Here, we report a critical role of the induced reactive oxygen species (ROS)-mediated cellular activation of a protein cross-linking enzyme, transglutaminase 2 (TG2), in liver injury by AA. In cultures of hepatic cells, AA dose-dependently suppressed cell growth, which accompanied the induced nuclear accumulation of TG2, as demonstrated in EGFP-tagged, TG2-overexpressing hepatic cells. A chemical inhibitor/shRNA that acts against TG2 prevented AA-mediated cell growth suppression. In addition, AA provoked significant production of ROS, and antioxidants blocked AA-induced activation of nuclear TG2 and hepatic cell growth suppression. We prop

SUBMITTER: Qin XY 

PROVIDER: S-EPMC6168684 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature