Dose and Latency Effects of Leucine Supplementation in Modulating Glucose Homeostasis: Opposite Effects in Healthy and Glucocorticoid-Induced Insulin-Resistance States

نویسندگان

  • Nelo Eidy Zanchi
  • Lucas Guimarães-Ferreira
  • Mário Alves de Siqueira-Filho
  • Vitor Felitti
  • Humberto Nicastro
  • Carlos Bueno
  • Fábio Santos Lira
  • Marshall Alan Naimo
  • Patrícia Campos-Ferraz
  • Maria Tereza Nunes
  • Marília Seelaender
  • Carla Roberta de Oliveira Carvalho
  • François Blachier
  • Antonio Herbert Lancha
چکیده

Dexamethasone (DEXA) is a potent immunosupressant and anti-inflammatory agent whose main side effects are muscle atrophy and insulin resistance in skeletal muscles. In this context, leucine supplementation may represent a way to limit the DEXA side effects. In this study, we have investigated the effects of a low and a high dose of leucine supplementation (via a bolus) on glucose homeostasis, muscle mass and muscle strength in energy-restricted and DEXA-treated rats. Since the leucine response may also be linked to the administration of this amino acid, we performed a second set of experiments with leucine given in bolus (via gavage) versus leucine given via drinking water. Leucine supplementation was found to produce positive effects (e.g., reduced insulin levels) only when administrated in low dosage, both via the bolus or via drinking water. However, under DEXA treatment, leucine administration was found to significantly influence this response, since leucine supplementation via drinking water clearly induced a diabetic state, whereas the same effect was not observed when supplied via the gavage.

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عنوان ژورنال:

دوره 4  شماره 

صفحات  -

تاریخ انتشار 2012