Downregulation of the Glo1 Gene Is Associated with Reduced Adiposity and Ectopic Fat Accumulation in Spontaneously Hypertensive Rats

0535655 - FGÚ 2021 RIV CH eng J - Journal Article
Šilhavý, Jan - Malínská, H. - Hüttl, M. - Marková, I. - Oliyarnyk, O. - Mlejnek, Petr - Šimáková, Miroslava - Liška, František - Kazdová, L. - Moravcová, R. - Novotný, J. - Pravenec, Michal
Downregulation of the Glo1 Gene Is Associated with Reduced Adiposity and Ectopic Fat Accumulation in Spontaneously Hypertensive Rats.
Antioxidants. Roč. 9, č. 12 (2020), č. článku 1179. E-ISSN 2076-3921
Grant - others:AV ČR(CZ) AP1502
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:67985823
Keywords : Glo1 gene knockdown * spontaneously hypertensive rat * methylglyoxal * heart * adipose tissue * insulin resistance * AMPK * GLUT4
OECD category: Cardiac and Cardiovascular systems
Impact factor: 6.313, year: 2020
Method of publishing: Open access
https://www.mdpi.com/2076-3921/9/12/1179

Methylglyoxal (MG), a potent precursor of advanced glycation end-products (AGE), is increased in metabolic disorders such as diabetes and obesity. MG and other dicarbonyl metabolites are detoxified by the glyoxalase system in which glyoxalase 1, coded by the Glo1 gene, serves as the rate-limiting enzyme. In this study, we analyzed the effects of Glo1 downregulation on glucose and lipid metabolism parameters in spontaneously hypertensive rats (SHR) by targeting the Glo1 gene (SHR-Glo1+/− heterozygotes). Compared to SHR wild-type animals, SHR-Glo1+/− rats showed significantly reduced Glo1 expression and lower GLO1 activity in tissues associated with increased MG levels. In contrast to SHR controls, SHR-Glo1+/− rats exhibited lower relative weight of epididymal fat, reduced ectopic fat accumulation in the liver and heart, and decreased serum triglycerides. In addition, compared to controls, SHR-Glo1+/− rats showed reduced serum insulin and increased basal and insulin stimulated incorporation of glucose into white adipose tissue lipids (lipogenesis). Reduced ectopic fat accumulation in the heart was associated with significantly increased pAMPK/AMPK ratio and GLUT4 activity. These results provide evidence that Glo1 downregulation in SHR is associated with reduced adiposity and ectopic fat accumulation, most likely mediated by AMPK activation in the heart.
Permanent Link: http://hdl.handle.net/11104/0314529