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Features of α 2 -Adrenergic Regulation of Isolated Rat Heart after Hypokinesia.
Bulletin of Experimental Biology and Medicine 2024 January 9
We studied the effect of the α2 -adrenergic receptor agonist clonidine hydrochloride (10-9 -10-6 M) on the isolated heart of adult rats after 30-day restriction of motor activity. In hypokinetic rats, in comparison with control animals, clonidine caused a positive inotropic effect; the dynamics of coronary flow was changed after stimulation of α2 -adrenergic receptors by clonidine in the minimum and maximum concentrations. Moreover, clonidine in concentrations of 10-8 and 10-7 M reduced coronary flow both in the control group and against the background of hypokinesia. Clonidine (10-8 -10-6 M) had a negative chronotropic effect in control and hypokinetic animals, while the dynamics of HR was multidirectional, i.e. either an increase or decrease in the effects was observed depending of the agonist concentration. Overall, the data obtained indicate the participation of α2 -adrenergic receptors in adaptive processes after motor activity limitation.
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