Chronic leucine supplementation increases body weight and insulin sensitivity in rats on high-fat diet likely by promoting insulin signaling in insulin-target tissues.
Mol Nutr Food Res
; 57(6): 1067-79, 2013 Jun.
Article
en En
| MEDLINE
| ID: mdl-23404947
SCOPE: This study investigated the effect of chronic leucine supplementation on insulin sensitivity and the associated mechanisms in rats on high-fat diet (HFD). METHODS AND RESULTS: Male Sprague-Dawley rats were fed either normal chow diet or HFD supplemented with 0, 1.5, 3.0, and 4.5% leucine for 24 weeks. We found that chronic leucine supplementation increased insulin sensitivity together with increased body weight in rats on HFD, but had no effect on insulin sensitivity in rats on normal chow diet. The increased insulin sensitivity by leucine supplementation was not associated with altered ectopic fat accumulation in liver and muscle, plasma levels of lipids and cytokines, but is associated with reduced oxidative stress and improved insulin signaling. Chronic leucine supplementation did not enhance insulin receptor substract-1 (IRS-1) phosphorylation on serine 302, but elevated basal IRS-1 phosphorylation on tyrosine 632 and improved insulin-stimulated protein kinase B (Akt) and mammalian target of rapamycin (mTOR) phosphorylation in liver, skeletal muscle, and adipose tissue of rats on HFD rats, indicating leucine supplementation prevented HFD-induced insulin resistance in insulin-target tissues. CONCLUSION: Chronic leucine supplementation can increase insulin sensitivity and body weight likely by reducing oxidative stress and improving insulin signaling pathway in rats on HFD.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Peso Corporal
/
Resistencia a la Insulina
/
Insulina
/
Leucina
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Revista:
Mol Nutr Food Res
Asunto de la revista:
CIENCIAS DA NUTRICAO
Año:
2013
Tipo del documento:
Article
Pais de publicación:
Alemania