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Author Lin, Qiu-Ru ♦ Li, Chen-Guang ♦ Zha, Qing-Bing ♦ Xu, Li-Hui ♦ Pan, Hao ♦ Zhao, Gao-Xiang ♦ Ouyang, Dong-Yun ♦ He, Xian-Hui
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword APPLIED LIFE SCIENCES ♦ ACETIC ACID ♦ APOPTOSIS ♦ ATP ♦ CATTLE ♦ CYSTEINE ♦ DMSO ♦ ELECTROPHORESIS ♦ GELS ♦ GLYCINE ♦ IN VIVO ♦ IODIDES ♦ LEUKOCYTES ♦ LIPOPOLYSACCHARIDES ♦ LYMPHOKINES ♦ MACROPHAGES ♦ MICE ♦ OXYGEN ♦ PEROXIDASES ♦ POTASSIUM CHLORIDES ♦ RADISHES ♦ RNA ♦ SULFATES
Abstract Gossypol, a polyphenolic compound isolated from cottonseeds, has been reported to possess many pharmacological activities, but whether it can influence inflammasome activation remains unclear. In this study, we found that in mouse macrophages, gossypol induced cell death characterized by rapid membrane rupture and robust release of HMGB1 and pro-caspase-11 comparable to ATP treatment, suggesting an induction of pyroptotic cell death. Unlike ATP, gossypol induced much low levels of mature interleukin-1β (IL-1β) secretion from mouse peritoneal macrophages primed with LPS, although it caused pro-IL-1β release similar to that of ATP. Consistent with this, activated caspase-1 responsible for pro-IL-1β maturation was undetectable in gossypol-treated peritoneal macrophages. Besides, RAW 264.7 cells lacking ASC expression and caspase-1 activation also underwent pyroptotic cell death upon gossypol treatment. In further support of pyroptosis induction, both pan-caspase inhibitor and caspase-1 subfamily inhibitor, but not caspase-3 inhibitor, could sharply suppress gossypol-induced cell death. Other canonical pyroptotic inhibitors, including potassium chloride and N-acetyl-L-cysteine, could suppress ATP-induced pyroptosis but failed to inhibit or even enhanced gossypol-induced cell death, whereas nonspecific pore-formation inhibitor glycine could attenuate this process, suggesting involvement of a non-canonical pathway. Of note, gossypol treatment eliminated thioglycollate-induced macrophages in the peritoneal cavity with recruitment of other leukocytes. Moreover, gossypol administration markedly decreased the survival of mice in a bacterial sepsis model. Collectively, these results suggested that gossypol induced pyroptosis in mouse macrophages via a non-canonical inflammasome pathway, which raises a concern for its in vivo cytotoxicity to macrophages. - Highlights: • Gossypol induces pyroptosis in mouse peritoneal and RAW 264.7 macrophages. • In LPS-primed macrophages, gossypol induces lower levels of mature IL-1β than ATP does. • Gossypol-induced pyroptosis does not rely on canonical caspase-1 activation. • Gossypol probably induces pyroptosis via a non-canonical inflammasome pathway. • Gossypol decreases the survival of mice in a bacterial sepsis model.
ISSN 0041008X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-02-01
Publisher Place United States
Journal Toxicology and Applied Pharmacology
Volume Number 292


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