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  • Title: Actions of insulin-potentiating peptides on glycogen synthesis.
    Author: Ng FM, Larner J.
    Journal: Diabetes; 1976 May; 25(5):413-9. PubMed ID: 817952.
    Abstract:
    The action of urinary and synthetic AcG (acceleratory factor from growth hormone) peptides was studied in vitro and in vivo. Both peptides were inactive alone and active only in the presence of insulin to enhance glucose uptake, glycogen synthesis, and glycogen synthase conversion to the active I form in vitro and in vivo. Responses were dependent on both peptide and insulin concentrations in a dose-dependent manner. No response was obtained with glucose alone, but the presence of glucose did enhance the response of insulin alone or insulin in the presence of peptide. It is concluded that both AcG peptides enhance either the effective concentration or the activity of insulin at its site of action.
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