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- W2025308145 abstract "Abstract: Anoxia elevates levels of cyclic AMP and depresses levels of cyclic GMP in cerebral cortex of mice. Similar effects are also observed in other regions of the brain. Aminophylline inhibits accumulation of cyclic AMP about 50% in hippocampus and cerebellum, but not in cerebral cortex and striaturn; however, this effect requires high doses (250 mgikg). Pretreatment of animals with reserpine, which depletes brain stores of norepinephrine, dopamine, and serotonin, and also produces sedation and mild hypothermia, markedly inhibits accumulation of cyclic AMP in all regions of anoxic brain. Destruction of norepinephrine terminals by treatment of neonatal animals with 6-OH- dopamine, which does not sedate or produce hypothermia, has an effect on cyclic AMP levels similar to that of reserpine. None of the above treatments modifies the effect of anoxia on cyclic GMP levels. These data indicate that norepinephrine is a major regulator of cyclic AMP levels in anoxic brain and that adenosine and, perhaps, other unidentified substances have lesser roles in this process. In contrast, biogenic amines and adenosine appear to have no effect on cyclic GMP regulation in anoxic brain. Reserpine slows the activation of phosphorylase and the utilization of ATP, and slightly attenuates the breakdown of glycogen caused by anoxia, but has no effect on the changes in glucose, lactate, or phosphocreatine. In contrast, 6-OH-dopamine has no effect on any of these anoxiainduced changes. It is concluded that the effect of reserpine on phosphorylase, glycogen, and ATP is most likely related to the hypothermic and sedative effect of the drug, and that either cyclic AMP is not responsible for initiating glycogenolysis in anoxic brain or only a small rise in cyclic AMP levels is necessary for this process." @default.
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- W2025308145 date "1980-05-01" @default.
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- W2025308145 title "Mechanisms of Cyclic AMP Regulation in Cerebral Anoxia and Their Relationship to Glycogenolysis" @default.
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- W2025308145 doi "https://doi.org/10.1111/j.1471-4159.1980.tb09976.x" @default.
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