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Central alpha-2 adrenoceptors regulate central and peripheral functions.

F Fornai1, C Blandizzi, M del Tacca

  • 1Institute of Medical Pharmacology, University of Pisa, Italy.

Pharmacological Research
|September 1, 1990
PubMed
Summary
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Central alpha-2 adrenoceptors are key regulators of numerous bodily functions, including blood pressure and sleep. Their activation influences various physiological processes, similar to mu opioid receptors.

Area of Science:

  • Neuropharmacology
  • Central Nervous System (CNS) Regulation

Background:

  • Central alpha-2 adrenoceptors modulate critical functions: blood pressure, gastrointestinal activity, hormone secretion, sleep-waking cycles, analgesia, and anxiety.
  • Clonidine, an alpha-2 agonist, is known to lower blood pressure and reduce gastrointestinal and salivary secretions.
  • Sedative and analgesic effects of agents like detomidine are linked to central alpha-2 adrenoceptor activation.

Purpose of the Study:

  • To review the prominent data on the regulatory roles of central alpha-2 adrenoceptors in overall physiological functions.
  • To highlight the significance of somatodendritic alpha-2 autoreceptors in modulating central noradrenergic activity.
  • To discuss the involvement of central alpha-2 heteroreceptors in regulating diverse physiological functions.

Main Methods:

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  • Literature review of existing experimental data and research findings.
  • Analysis of studies investigating the effects of alpha-2 adrenoceptor agonists.
  • Examination of evidence regarding the roles of alpha-2 autoreceptors and heteroreceptors.

Main Results:

  • Central alpha-2 adrenoceptors significantly influence blood pressure, gastrointestinal function, sleep, and pain perception.
  • Somatodendritic alpha-2 autoreceptors are emphasized as crucial modulators of central noradrenergic activity.
  • Central alpha-2 heteroreceptors play a relevant role in the regulation of multiple functions.
  • The effects of alpha-2 adrenoceptor activation share similarities with mu opioid receptor stimulation due to shared cellular mechanisms.

Conclusions:

  • Central alpha-2 adrenoceptors are vital regulators of a wide spectrum of physiological functions within the CNS.
  • The distinct roles of somatodendritic and presynaptic alpha-2 autoreceptors and heteroreceptors are increasingly recognized.
  • The functional overlap with mu opioid receptors underscores the complex inhibitory mechanisms mediated by alpha-2 adrenoceptors.