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Activation of phosphoprotein phosphatases by growth hormone sequences with insulin-like activity

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Abstract

The N-terminal part sequences of pituitary growth hormone, Nα-acetyl-hGH 7–13 and hGH 6–13, promoted conversion of glycogen synthase b to glycogen synthase a in skeletal muscle and adipose tissue when injected intravenously. The peptides also caused conversion of phosphorylase a to phosphorylase b in liver and adipose tissue, but not in muscle, where the peptides antagonised activation of phosphorylase. Synthase phosphatase activity in muscle and phosphorylase phosphatase activity in liver increased after injection of peptide, with time courses of change similar to those seen for muscle synthase and liver phosphorylase activities. Injection of peptide also decreased both the cyclic AMP dependent and independent synthase kinase activities in muscle. These results show that the insulin-like activities of these peptides on glycogen synthase and phosphorylase involve both increases in protein phosphatase activities and inhibition of protein kinase activities. These results are discussed in relation to the insulin-like activities of growth hormone.

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Authors and Affiliations

  1. Department of Biochemistry, Monash University, 3168, Clayton, Victoria, Australia

    S. L. Macaulay, Julie D. Newman, J. D. Mc Armstrong & J. Bornstein

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  1. S. L. Macaulay
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  2. Julie D. Newman
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  3. J. D. Mc Armstrong
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  4. J. Bornstein
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Macaulay, S.L., Newman, J.D., Mc Armstrong, J.D. et al. Activation of phosphoprotein phosphatases by growth hormone sequences with insulin-like activity. Mol Cell Biochem 74, 95–101 (1987). https://doi.org/10.1007/BF00221916

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  • DOI: https://doi.org/10.1007/BF00221916

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