Title

Liver-Specific Gh Receptor Gene-Disrupted (Lighrko) Mice Have Decreased Endocrine Igf-I, Increased Local Igf-I, And Altered Body Size, Body Composition, And Adipokine Profiles

Abstract

GHis an important regulator of body growth and composition as well as numerous other metabolic processes. In particular, liver plays a key role in the GH/IGF-I axis, because the majority of circulating "endocrine" IGF-I results from GH-stimulated liver IGF-I production. To develop a better understanding of the role of liver in the overall function of GH, we generated a strain of mice with liver-specific GH receptor (GHR) gene knockout (LiGHRKO mice). LiGHRKO mice had a 90% decrease in circulating IGF-I levels, a 300% increase in circulating GH, and significant changes in IGF binding protein (IGFBP)-1, IGFBP-2, IGFBP-3, IGFBP-5,andIGFBP-7.LiGHRKOmiceweresmaller than controls, with body length and body weight being significantly decreased in both sexes. Analysis of body composition over time revealed a pattern similar to those found inGHtransgenic mice; that is, LiGHRKO mice had a higher percentage of body fat at early ages followed by lower percentage of body fat in adulthood. Local IGF-ImRNAlevels were significantly increased in skeletal muscleand select adipose tissue depots. Grip strengthwasincreased inLiGHRKOmice. Finally, circulating levels of leptin, resistin, and adiponectin were increased in LiGHRKO mice. In conclusion, LiGHRKO mice are smaller despite increased local mRNA expression of IGF-I in several tissues, suggesting that liver-derived IGF-I is indeed important for normal body growth. Furthermore, our data suggest that novel GH-dependent cross talk between liver and adipose is important for regulation of adipokines in vivo. ©2014 by the Endocrine Society.

Publication Date

1-1-2014

Publication Title

Endocrinology

Volume

155

Issue

5

Number of Pages

1793-1805

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1210/en.2013-2086

Socpus ID

84899431801 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84899431801

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