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The FASEB Journal, Vol 6, 832-839, Copyright © 1992 by The Federation of American Societies for Experimental Biology
REVIEWS |
DB Bylund
Department of Pharmacology, College of Medicine, University of Nebraska Medical Center, Omaha 68198-6260.
The adrenergic receptors are members of the superfamily of G protein- coupled receptors. There are three major types of adrenergic receptors: alpha 1, alpha 2, and beta. Each of these three major types can be divided into three subtypes. Within the alpha 1-adrenergic receptors, alpha 1A and alpha 1B subtypes have been defined pharmacologically on the basis of reversible antagonists, such as WB4101 and phentolamine, and the irreversible antagonist chloroethylclonidine. In at least some tissues the mechanism of action of the alpha 1A subtype is related to activation of a calcium channel, whereas the alpha 1B receptor exerts its effect through the second messenger inositol trisphosphate. Both of these receptor subtypes as well as a third, the alpha 1C, have been identified by molecular cloning. Three pharmacological subtypes of the alpha 2-adrenergic receptor have also been identified. Prototypic tissues and cell lines in continuous culture have been developed for each of these subtypes, which facilitated their study. The definition of the alpha 2 subtypes has been based on radioligand binding data and more limited functional data. All three subtypes have been shown to inhibit the activation of adenylate cyclase and thus reduce the levels of cAMP. Three alpha 2-adrenergic receptor subtypes have been identified by molecular cloning in both the human and rat species. There is reasonable agreement between the pharmacological identified subtypes and those identified by molecular cloning.
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