Effects of Preconditioning on the Resistance to Acute Hypobaric Hypoxia and Their Correction with Selective Antagonists of Nicotinic Receptors |
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Authors: | E I Zakharova A M Dudchenko E L Germanova |
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Institution: | 1.Institute of General Pathology and Pathophysiology,Russian Academy of Medical Sciences,Moscow,Russia |
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Abstract: | Hypobaric hypoxic preconditioning increased the resistance of low resistant and highly resistant rats to acute hypobaric hypoxia
at a critical height. Intergroup differences in the resistance of rats to acute hypobaric hypoxia were not observed after
hypobaric hypoxia and one variational series with a wide range of resistance (4.5-24.5 min) appeared. Methyllycaconitine,
an antagonist of subtype α7 nicotinic cholinergic receptors, abolished the influence of hypobaric hypoxia on low resistant rats, but had no effect on
highly resistant animals. Mecamylamine, a preferential antagonist of subtype α4β2 and α3-containing cholinergic receptors, did not modulate the effect of hypobaric hypoxia. By contrast, hypobaric hypoxia abolished
the effect of mecamylamine on the resistance of rats that were not trained under conditions of hypobaric hypoxia (low resistant
and highly resistant animals with low sensitivity to hypobaric hypoxia). We conclude that the same effect of hypobaric hypoxia
is mediated by various mechanisms, which involve different nicotinic cholinergic receptors. They differ from the resistance
mechanisms in non-trained rats. |
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