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- W2024154903 abstract "Abstract Previous studies using rat adipocytes have shown that the ability of insulin to antagonize lipolysis induced by physiological concentrations of catecholamines is diminished at high concentrations of these hormones. Since such high concentrations of catecholamines cause an accumulation of free fatty acids, a decrease in cellular ATP level and a ‘short lived’ increase in cAMP (that is many fold higher than required to activate lipolysis maximally), we studied which of these modulates the antilipolytic activity of insulin. We found that inhibition of adenylate cyclase by virazole (2 mM), which lowers the initial cyclic AMP burst by about 70%, enables insulin to antagonize lipolysis at high isoproterenol concentrations. In contrast, reduction of cellular ATP level by 40% and 70%, using cyanide ion, or increasing free fatty acids in the medium to a level that suppresses the effects of insulin on glucose metabolism, failed to compromise the antilipolytic activity of the hormone. These data indicate that the inability of insulin to antagonize lipolysis induced by high isoproterenol concentrations is the direct consequence of the initial, larger burst of cyclic AMP." @default.
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- W2024154903 date "1982-12-01" @default.
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- W2024154903 title "Evaluation of factors responsible for the inability of insulin to antagonize lipolysis due to high concentrations of catecholamines" @default.
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- W2024154903 doi "https://doi.org/10.1016/0006-291x(82)92007-1" @default.
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