Nrf2-Mediated Antioxidant Defense and Peroxiredoxin 6 Are Linked to Biosynthesis of Palmitic Acid Ester of 9-Hydroxystearic Acid

0489998 - FGÚ 2019 RIV US eng J - Journal Article
Kuda, Ondřej - Březinová, Marie - Šilhavý, Jan - Landa, Vladimír - Zídek, Václav - Dodia, Ch. - Kreuchwig, F. - Vrbacký, Marek - Balas, L. - Durand, T. - Hübner, N. - Fisher, A. B. - Kopecký, Jan - Pravenec, Michal
Nrf2-Mediated Antioxidant Defense and Peroxiredoxin 6 Are Linked to Biosynthesis of Palmitic Acid Ester of 9-Hydroxystearic Acid.
Diabetes. Roč. 67, č. 6 (2018), s. 1190-1199. ISSN 0012-1797. E-ISSN 1939-327X
R&D Projects: GA ČR(CZ) GA16-04859S; GA ČR(CZ) GJ17-10088Y; GA MŠMT(CZ) ED1.1.00/02.0109; GA MŠMT(CZ) LTAUSA17173
Institutional support: RVO:67985823
Keywords : FAHFAs * white adipose tissue * Nrf2 * lipogenesis * diabetes * PAHSA
OECD category: Endocrinology and metabolism (including diabetes, hormones)
Impact factor: 7.199, year: 2018

Fatty acid esters of hydroxy fatty acids (FAHFAs) are lipid mediators with promising antidiabetic and anti-inflammatory properties that are formed in white adipose tissue (WAT) via de novo lipogenesis, but their biosynthetic enzymes are unknown. Using a combination of lipidomics in WAT, quantitative trait locus mapping, and correlation analyses in rat BXH/HXB recombinant inbred strains, as well as response to oxidative stress in murine models, we elucidated the potential pathway of biosynthesis of several FAHFAs. Comprehensive analysis of WAT samples identified ∼160 regioisomers, documenting the complexity of this lipid class. The linkage analysis highlighted several members of the nuclear factor, erythroid 2 like 2 (Nrf2)-mediated antioxidant defense system (Prdx6, Mgst1, Mgst3), lipid-handling proteins (Cd36, Scd6, Acnat1, Acnat2, Baat), and the family of flavin containing monooxygenases (Fmo) as the positional candidate genes. Transgenic expression of Nrf2 and deletion of Prdx6 genes resulted in reduction of palmitic acid ester of 9-hydroxystearic acid (9-PAHSA) and 11-PAHSA levels, while oxidative stress induced by an inhibitor of glutathione synthesis increased PAHSA levels nonspecifically. Our results indicate that the synthesis of FAHFAs via carbohydrate-responsive element-binding protein–driven de novo lipogenesis depends on the adaptive antioxidant system and suggest that FAHFAs may link activity of this system with insulin sensitivity in peripheral tissues.
Permanent Link: http://hdl.handle.net/11104/0284287