Endocrinology, Vol 126, 3274-3276, Copyright © 1990 by Endocrine Society

ARTICLES

Non-lactogenic effects of growth hormone on growth and insulin-like growth factor-I messenger ribonucleic acid of rat mammary gland [published erratum appears in Endocrinology 1990 Oct;127(4):1977]

DL Kleinberg, W Ruan, V Catanese, CB Newman and M Feldman
Department of Medicine, New York Veterans Administration Medical Center, N.Y.

In contrast to established dogma that PRL is central in mammary development, and GH mimics PRL in affecting growth because of structural similarities, we found that both hGH, which is lactogenic, and rGH, which is non-lactogenic, were significantly more potent than hPRL and rPRL in stimulating mammary growth in rats. Additionally, hGH was more potent than hPRL in increasing mammary IGF-I mRNA content. These data indicate that GH has separate effects on parameters of mammary gland growth, suggesting an independent role for GH in mammary growth.

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