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- W2091424348 abstract "Stimulation of ornithine decarboxylase (ODC) activity was examined in cultured heart cells from neonatal rats. Fetal bovine serum had a concentration-dependent effect on ODC activity with maximum response obtained at 10% serum. ODC activity peaked 4 h after the addition of serum and returned to initial levels at 8 h. In the absence of serum, non-cytotoxic concentrations of the adrenergic agonists epinephrine, norepinephrine or isoproterenol did not stimulate ODC activity. Co-administration of serum and catecholamines at 10(-5) M induced an ODC response that was significantly greater than that induced by serum alone. A screen of various constituents of serum revealed that insulin, though relatively ineffective alone, acted cooperatively with catecholamines to produce an ODC response equivalent to that induced by 10% serum. Propranolol effectively blocked the cooperative effect of insulin on catecholamine stimulation of ODC activity, and markedly inhibited the stimulation of ODC by 10% serum. Insulin also acted cooperatively with the second-messenger analogue dibutyryl-cAMP. The calcium ionophore A23187 significantly increased ODC activity and this response was potentiated by the presence of insulin. The present findings are concordant with in vivo observations in that beta-adrenergic activation stimulates ODC activity in cultured heart cells, but it also demonstrates that the cooperative action of other factors present in serum, such as insulin, are required." @default.
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- W2091424348 date "1990-06-01" @default.
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- W2091424348 title "Cooperative action of insulin and catecholamines on stimulation of ornithine decarboxylase activity in neonatal rat heart cells" @default.
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- W2091424348 doi "https://doi.org/10.1016/0022-2828(90)91007-t" @default.
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