IGF-I improved bone mineral density and body composition of weaver mutant mice.

Abstract

Our recent report on a parallel decrease in the body weights and serum IGF-I levels of weaver mice suggests that IGF-I's endocrine function may be impaired in neurodegenerative diseases. To further understand the overall effects of IGF-I deficiency on the postnatal growth, we measured bone mineral density (BMD), bone mineral content (BMC), lean body mass (LBM) and fat mass in male and female weaver mice and wild-type littermates on D21 (prepuberty), D45 (puberty), and D60 (postpuberty) using dual-energy X-ray absorptiometry (DEXA). In both male and female weaver mice, we found that the levels of circulating IGF-I paralleled those of BMD, BMC, and LBM, but not the fat mass. Male weaver mice have normal fat mass at all three ages studied, whereas female weaver mice showed a trend to increase their fat mass as they mature. To determine whether circulating IGF-I is a determinant of body composition, we crossbred IGF-I transgenic mice with homozygous weaver mice, which resulted in a significant increase in circulating IGF-I levels in both male and female weaver mice and normalization of their BMD, BMC and body weights. In summary, our results demonstrated that normal circulating IGF-I levels are important in maintaining BMD, BMC, and body composition in neurodegenerative diseases, such as hereditary cerebellar ataxia.

• Authors: Weiguo Yao, Jin Zhong, Jun Yu, Therry Warner, Tomica Bozic, Ping Ye, A Joseph D'Ercole, Janet M Hock, Wei-Hua Lee
• Journal: Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society (Growth Horm IGF Res) Vol. 18 Issue 6 Pg. 517-25 (Dec 2008) ISSN: 1532-2238 [Electronic] Scotland
• PMID: 18550407 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Insulin-Like Growth Factor I

Topics

• Animals
• Body Composition (physiology)
• Body Weight (physiology)
• Bone Density (physiology)
• Cerebellar Ataxia (genetics, physiopathology)
• Female
• Insulin-Like Growth Factor I (metabolism)
• Male
• Mice
• Mice, Neurologic Mutants