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Differential effects of insulin and insulin-like growth factor-I in the femoral tissues of rats with skeletal unloading

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Abstract

The alteration of bone metabolism in the femur of rats with skeletal unloading for 4 days was investigated. Skeletal unloading was designed using the model of hindlimb hang in rats. Skeletal unloading caused a significant decrease in femoral weight, calcium, and phosphorus contents in the metaphysis but not diaphysis. Also, the unloading induced a significant decrease of zinc content, alkaline phosphatase activity, and deoxyribonucleic acid (DNA) content in the femoral diaphysis and metaphysis. When the femoraldiaphyseal and metaphyseal tissues from normal and skeletal-unloading rats were cultured in the presence of insulin (10-9 and 10-8 M) for 24 hours in vitro, the hormonal effect to increase alkaline phosphatase activity and DNA content in the diaphysis, but not metaphysis, was lost in the bone tissues from unloading rats. However, the culture with insulin-like growth factor-I (IGF-I; 10-8 and 10-7 M) produced a significant increase of alkaline phosphatase activity and DNA content in both the diaphyseal and metaphyseal tissues from normal and unloading rats. These results demonstrate that skeletal unloading causes an impairment of insulin effect, but not IGF-I effect, on bone metabolism in femoral tissues.

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  1. Laboratory of Metabolism and Endocrinology, Graduate School of Nutritional Sciences, University of Shizuoka, 52-1 Yada, 422, Shizuoka City, Japan

    M. Yamaguchi & S. Kishi

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  1. M. Yamaguchi
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  2. S. Kishi
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Yamaguchi, M., Kishi, S. Differential effects of insulin and insulin-like growth factor-I in the femoral tissues of rats with skeletal unloading. Calcif Tissue Int 55, 363–367 (1994). https://doi.org/10.1007/BF00299316

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  • DOI: https://doi.org/10.1007/BF00299316

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