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• W2016310366 abstract "Alterations in central concentrations of cyclic nucleotides occur in mammalian brain during ischemic episodes. Our aim was to evaluate the catecholamine sensitivity of adenylate cyclase using homogenates of the gerbil cerebral cortex during periods of bilateral ischemia and recirculation. After 15-min ischemia without recirculation, the sensitivity of adenylate cyclase was usually enhanced to norepinephrine (NE) and dopamine (DA) alone or in the presence of guanosine triphosphate (GTP) but not 5′-guanylyl imidodiphosphate [Gpp(NH)p]. After 60-min ischemia (no recirculation), the sensitivity of the enzyme to NE and DA showed either no change from sham controls or a slight decrease. Responses, however, in the presence of GTP remained elevated. When the animals were subjected to 15-min ischemia followed by 15-min recirculation, enzyme activation by NE and DA with or without GTP and Gpp(NH)p was usually greater than controls. After 60-min ischemia plus 15-min recirculation, however, enzyme responsiveness to catecholamines and NaF was attenuated. No changes in either high and low Km cyclic AMP phosphodiesterase or in guanylate cyclase were observed during ischemic episodes. The results indicate that the catecholamine-elicited activity of adenylate cyclase became elevated as a consequence of a short duration of ischemia. Longer periods of ischemia thought to be irreversible showed deficits in adenylate-cyclase sensitivity to catecholamines unless GTP was present. In the presence of GTP, enzyme sensitivity was restored as long as recirculation was prevented. Thus adverse consequences of recirculation on neuronal membranes or receptors could be evaluated by their state of GTP sensitivity." @default.
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• W2016310366 date "1982-06-01" @default.
• W2016310366 modified "2023-09-23" @default.
• W2016310366 title "Alterations of catecholamine-sensitive adenylate cyclase in gerbil cerebral cortex after bilateral ischemia" @default.
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• W2016310366 doi "https://doi.org/10.1016/0014-4886(82)90119-4" @default.
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