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Related Experiment Videos

Classification of alpha 1-adrenoceptor subtypes

M C Michel1, B Kenny, D A Schwinn

  • 1Department of Medicine, University of Essen, Germany.

Naunyn-Schmiedeberg'S Archives of Pharmacology
|July 1, 1995
PubMed
Summary

Pharmacological identification of alpha 1-adrenoceptor subtypes has advanced with cloned receptors. The alpha 1d-adrenoceptor may be present in tissues previously thought to express only alpha 1A and alpha 1B subtypes.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Adrenergic Receptor Research

Background:

  • Two alpha 1-adrenoceptor subtypes (alpha 1A and alpha 1B) were previously identified using pharmacological methods.
  • Three distinct cDNAs encoding alpha 1-adrenoceptor subtypes have been successfully cloned.

Purpose of the Study:

  • To review the features of the three recognized alpha 1-adrenoceptor subtypes (alpha 1a, alpha 1b, and alpha 1d).
  • To discuss potential challenges and pitfalls in the pharmacological identification of these receptor subtypes.
  • To facilitate the alignment between cloned and pharmacologically defined alpha 1-adrenoceptor subtypes.

Main Methods:

  • Utilizing subtype-selective compounds to profile cloned and endogenous receptors.
  • Comparing pharmacological profiles of known compounds with receptor subtypes.
  • Reviewing existing literature on alpha 1-adrenoceptor characterization.

Main Results:

  • Alignment between cloned and pharmacologically defined alpha 1-adrenoceptor subtypes has been achieved.
  • The alpha 1d-adrenoceptor (previously designated alpha 1a, alpha 1d, or alpha 1a/d) is now recognized.
  • Tissues previously identified as expressing alpha 1A and/or alpha 1B subtypes may also contain alpha 1d-adrenoceptors.

Conclusions:

  • The recognition of three distinct alpha 1-adrenoceptor subtypes (alpha 1a, alpha 1b, alpha 1d) clarifies previous classifications.
  • The alpha 1d-adrenoceptor shares characteristics with both alpha 1A- and alpha 1B-adrenoceptors, necessitating careful identification.
  • Understanding the distinct features and potential co-expression of these subtypes is crucial for accurate pharmacological studies.

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