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DA Schwinn, GI Johnston, SO Page, MJ Mosley, KH Wilson, NP Worman, S Campbell, MD Fidock, LM Furness and DJ Parry-Smith
Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina.
We have cloned cDNAs encoding three human alpha-1 adrenergic receptor (AR) subtypes and characterized pharmacological properties of the expressed receptor protein. A number of significant sequence corrections have been identified and compared with previously published data, at both nucleotide and amino acid levels; the most major differences occur for the human alpha-1a/dAR. Pharmacological characterization was performed simultaneously using six cloned alpha- 1AR subtypes (human and rat alpha-1a/d, human and hamster alpha-1b, human and bovine alpha-1c) stably expressed in rat-1 fibroblasts at approximately equal receptor concentrations (1-2 pmol/mg of total protein). In general, human alpha-1AR subtypes have similar pharmacology compared to their rat, hamster and bovine homologs, although a few minor species differences important for alpha-1AR classification are noted. In addition, much lower inactivation (approximately 20%) by the alkylating agent chloroethylclonidine is noted in this study compared to previous reports for both human and bovine alpha-1cAR membrane preparations. All six alpha-1AR subtypes couple to phosphoinositide hydrolysis in a pertussis toxin-insensitive manner, including the cloned human alpha-1a/dAR which had not been expressed previously. In spite of significant sequence differences between human alpha-1ARs and their other species counterparts, previously established ligand selectivity remains fairly comparable. In summary, these data represent the first side-by-side comparison of pharmacological properties between species homologs of alpha-1AR subtypes and should facilitate the development of alpha-1AR subtype selective drugs for clinical use.
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