Mutant Wars2 gene in spontaneously hypertensive rats impairs brown adipose tissue function and predisposes to visceral obesity

0484413 - FGÚ 2018 RIV CZ eng J - Článek v odborném periodiku
Pravenec, Michal - Zídek, Václav - Landa, Vladimír - Mlejnek, Petr - Šilhavý, Jan - Šimáková, Miroslava - Trnovská, J. - Škop, V. - Marková, I. - Malínská, H. - Hüttl, M. - Kazdová, L. - Bardová, Kristina - Tauchmannová, Kateřina - Vrbacký, Marek - Nůsková, Hana - Mráček, Tomáš - Kopecký, Jan - Houštěk, Josef
Mutant Wars2 gene in spontaneously hypertensive rats impairs brown adipose tissue function and predisposes to visceral obesity.
Physiological Research. Roč. 66, č. 6 (2017), s. 917-924. ISSN 0862-8408. E-ISSN 1802-9973
Grant CEP: GA ČR(CZ) GA13-04420S
Institucionální podpora: RVO:67985823
Klíčová slova: brown adipose tissue * spontaneously hypertensive rat * quantitative trait loci * transgenic * Wars2 gene * mitochondrial proteosynthesis
Obor OECD: Endocrinology and metabolism (including diabetes, hormones)
Impakt faktor: 1.324, rok: 2017

Brown adipose tissue (BAT) plays an important role in lipid and glucose metabolism in rodents and possibly also in humans. Identification of genes responsible for BAT function would shed light on underlying pathophysiological mechanisms of metabolic disturbances. Recent linkage analysis in the BXH/HXB recombinant inbred (RI) strains, derived from Brown Norway (BN) and spontaneously hypertensive rats (SHR), identified two closely linked quantitative trait loci (QTL) associated with glucose oxidation and glucose incorporation into BAT lipids in the vicinity of Wars2 (tryptophanyl tRNA synthetase 2 (mitochondrial)) gene on chromosome 2. The SHR harbors L53F WARS2 protein variant that was associated with reduced angiogenesis and Wars2 thus represents a prominent positional candidate gene. In the current study, we validated this candidate as a quantitative trait gene (QTG) using transgenic rescue experiment. SHR-Wars2 transgenic rats with wild type Wars2 gene when compared to SHR, showed more efficient mitochondrial proteosynthesis and increased mitochondrial respiration, which was associated with increased glucose oxidation and incorporation into BAT lipids, and with reduced weight of visceral fat. Correlation analyses in RI strains showed that increased activity of BAT was associated with amelioration of insulin resistance in muscle and white adipose tissue. In summary, these results demonstrate important role of Wars2 gene in regulating BAT function and consequently lipid and glucose metabolism.
Trvalý link: http://hdl.handle.net/11104/0279584