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Asian-Australas J Anim Sci > Volume 10(2); 1997 > Article
Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 1997;10(2): 233-239.
DOI: https://doi.org/10.5713/ajas.1997.233    Published online April 1, 1997.
Hormonal regulation of insulin-like growth factor binding protein secretion by a bovine mammary epithelial cell line
W. Y. Kim, J. C. Chow, M. D. Hanigan, C. C. Calvert, J. K. Ha, R. L. Baldwin
Abstract
A mammary epithelial cell line (MAC-T) established as a model for lactation was utilized to identify and characterize effects of various hormones upon insulin-like growth factor binding protein secretion. Ligand and immunoblot analyses of conditioned media indicated that insulin-like growth factor binding protein-2 was secreted by MAC-T cells. Insulin-like growth factor-I stimulated insulin-like growth factor binding protein-2 secretion in a dose-dependent manner, but prolactin and bovine somatotropin did not alter insulin-like growth factor binding protein-2 secretion. Insulin increased and cortisol decreased insulin-like growth factor binding protein-2 secretion. Effects of insulin-like growth factor-I on insulin-like growth factor binding protein-2 secretion support previous studies using primary cultures of bovine mammary cells and bovine fibroblasts. Effects of cortisol and insulin on insulin-like growth factor binding protein-2 secretion may be explained by changes in protein synthesis. In addition, supraphysiological doses of insulin can cross-react with the insulin-like growth factor-I receptor and stimulate insulin-like growth factor binding protein-2 secretion. MAC-T cells provide a model system to study mechanisms that regulate local insulin-like growth factor-I bioactivity.
Keywords: Insulin-Like Growth Factor Binding Protein; Mammary Cell-Line


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