Differential impact of selective GH deficiency and endogenous GH excess on insulin-mediated actions in muscle and liver of male mice.

Cordoba-Chacon J, Gahete MD, McGuinness OP, Kineman RD
Am J Physiol Endocrinol Metab. 2014 307 (10): E928-34

PMID: 25269484 · PMCID: PMC4233257 · DOI:10.1152/ajpendo.00420.2014

A reciprocal relationship between insulin sensitivity and glucose tolerance has been reported in some mouse models and humans with isolated changes in growth hormone (GH) production and signaling. To determine if this could be explained in part by tissue-specific changes in insulin sensitivity, hyperinsulinemic-euglycemic clamps were performed in mice with adult-onset, isolated GH deficiency and in mice with elevated endogenous GH levels due to somatotrope-specific loss of IGF-I and insulin receptors. Our results demonstrate that circulating GH levels are negatively correlated with insulin-mediated glucose uptake in muscle but positively correlated with insulin-mediated suppression of hepatic glucose production. A positive relationship was also observed between GH levels and endpoints of hepatic lipid metabolism known to be regulated by insulin. These results suggest hepatic insulin resistance could represent an early metabolic defect in GH deficiency.

MeSH Terms (12)

Acromegaly Animals Glucose Glucose Clamp Technique Growth Hormone Insulin Insulin Resistance Liver Male Mice Mice, Transgenic Muscle, Skeletal

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