Summary
Acetylcholine synthesis in four brain regions (cerebral neocortex, hippocampus, septum and striatum) of the mouse during mild hypoxic hypoxia was measured by using [U-14C]glucose and [2H4] choline. At the same time, concentrations of norepinephrine and dopamine in four brain regions (cerebral neocortex, hippocampus, striatum and hypothalamus) were also estimated.
During 12% O2 hypoxia, concentrations of acetylcholine in the striatum were significantly decreased (P<0.05), whereas [2H4] acetylcholine, lactate and glucose did not alter in any regions studied. During 12% O2 hypoxia, concentrations of choline and [2H4]choline were significantly increased in all regions examined (P<0.05), except the [2H4]choline in the striatum. Radioactivity (dpm/100 mg protein) and specific activity (dpm/nmol) of acetylcholine were significantly decreased in the cerebral neocortex, hippocampus and septum (P<0.01) during 12% O2 hypoxia. A particularly marked decrease was found in the hippocampus, strongly suggesting that cholinergic terminals are particularly sensitive to hypoxia. In addition, these data also suggest that the acetylcholine synthesis from glucose might be more sensitive to hypoxia than that from choline.
During 12% O2g hypoxia, concentrations of catecholamine did not alter in any regions examined, whereas during 9% O2 hypoxia dopamine was significantly decreased in the cerebral neocortex and hippocampus (P<0.05).
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Shimada, M. Alteration of acetylcholine synthesis in mouse brain cortex in mild hypoxie hypoxia. J. Neural Transmission 50, 233–245 (1981). https://doi.org/10.1007/BF01249145
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DOI: https://doi.org/10.1007/BF01249145