TY - JOUR
T1 - 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
AU - List, Edward O.
AU - Berryman, Darlene E.
AU - Funk, Kevin
AU - Jara, Adam
AU - Kelder, Bruce
AU - Wang, Feiya
AU - Stout, Michael B.
AU - Zhi, Xu
AU - Sun, Liou
AU - White, Thomas A.
AU - LeBrasseur, Nathan K.
AU - Pirtskhalava, Tamara
AU - Tchkonia, Tamara
AU - Jensen, Elizabeth A.
AU - Zhang, Wenjuan
AU - Masternak, Michal M.
AU - Kirkland, James L.
AU - Miller, Richard A.
AU - Bartke, Andrzej
AU - Kopchick, John J.
PY - 2014/5
Y1 - 2014/5
N2 - 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.
AB - 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.
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U2 - 10.1210/en.2013-2086
DO - 10.1210/en.2013-2086
M3 - Article
C2 - 24517230
AN - SCOPUS:84899431801
SN - 0013-7227
VL - 155
SP - 1793
EP - 1805
JO - Endocrinology
JF - Endocrinology
IS - 5
ER -