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Dietary fructose-related adiposity and glucocorticoid receptor function in visceral adipose tissue of female rats

2014
Аутори:
Kovacevic, Sanja
Nestorov, Jelena
Matić, Gordana M.
Elaković, Ivana
Тип документа:
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Апстракт:
Excessive fructose intake coincides with the growing rate of obesity and metabolic syndrome, with women being more prone to these disorders than men. Findings that detrimental effects of fructose might be mediated by glucocorticoid regeneration in adipose tissue only indirectly implicated glucocorticoid receptor (GR) in the phenomenon. The aim of the present study was to elucidate whether fructose overconsumption induces derangements in GR expression and function that might be associated with fructose-induced adiposity in females. We examined effects of fructose-enriched diet on GR expression and function in visceral adipose tissue of female rats. Additionally, we analyzed the expression of genes involved in glucocorticoid prereceptor metabolism {[}11 beta-hydroxysteroid dehydrogenase type 1 (11 beta HSD1) and hexose-6-phosphate dehydrogenase], lipolysis (hormone-sensitive lipase) and lipogenesis (sterol regulatory element binding protein 1 and peroxisomal proliferator-activated receptor gamma). Fructose-fed rats had elevated energy intake that resulted in visceral adiposity, as indicated by increased visceral adipose tissue mass and its share in the whole-body weight. GR hormone binding capacity and affinity, as well as the expression of GR gene at both mRNA and protein levels were reduced in visceral adipose tissue of the rats on fructose diet. The glucocorticoid prereceptor metabolism was stimulated, as evidenced by elevated tissue corticosterone, while the key regulators of lipolysis and lipogenesis remained unaffected by fructose diet. The results suggest that the 11 beta HSD1-mediated elevation of intracellular corticosterone may induce GR downregulation, which may be associated with failure of GR to stimulate lipolysis in fructose-fed female rats.
Кључне речи:
Fructose diet; Glucocorticoid receptor; 11 beta HSD1; Visceral adipose tissue; Adiposity; Female rats
Извор:
European Journal of Nutrition, 2014, 53, 6, 1409-1420

DOI: 10.1007/s00394-013-0644-1

ISSN: 1436-6215

WoS: 000340881700012

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URI
http://ibiss-r.rcub.bg.ac.rs/123456789/2167
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