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Rate-dependent behavioral effects of stimulation of central motoric α1-adrenoceptors: hypothesized relation to depolarization blockade

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Abstract

Aim

The purpose of this review is to clarify how central α1-adrenoceptors control behavioral activity under varying conditions of activity and stress.

Method

The literature is reviewed regarding the behavioral actions of α1-agonists and antagonists, and α2-agonists and antagonists under conditions of high and low baseline activity and stress.

Results

It was found that α1-receptor stimulation of active behavior has a number of similarities to rate dependency including: (1) a dependence on low-active, low-stress conditions or on the prior depletion of endogenous brain catecholamines; (2) a nonmonotonic dose–response relationship with high doses producing a fall-off or actual depression of activity; (3) a failure to be blocked at high agonist doses by α1-antagonists; and (4) a facilitation by α2-adrenoceptor agonists which produce an opposing hyperpolarization.

Discussion

To explain these findings, it is proposed that high levels of stimulation of central α1-receptors produce, in host neurons, a depolarization block that impedes nerve impulse generation and inhibits active behavior. This effect is assumed to be precluded or mitigated by low-active, low-stress conditions, depletion of brain catecholamines, and by hyperpolarizing α2-agonists, and to be reversed at high agonist doses by α1-antagonists.

Conclusion

Because brain α1-receptors are not only involved in motor activity but also in the mechanism of action of antidepressant and stimulant drugs, arousal, anxiety, stress and psychosis, a depolarization block from intense stimulation of these receptors could have broad psychopharmacological consequences and underlie rate dependency to a variety of stimulant drugs.

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Acknowledgements

This study was supported in part by NIMH grant MH45265. The authors thank Jay Weiss for reading the paper and for helpful comments.

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Stone, E.A., Quartermain, D. Rate-dependent behavioral effects of stimulation of central motoric α1-adrenoceptors: hypothesized relation to depolarization blockade. Psychopharmacology 178, 109–114 (2005). https://doi.org/10.1007/s00213-004-2125-y

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