PMID: 11926967Apr 3, 2002Paper

Down-regulation of the alpha-2C adrenergic receptor: involvement of a serine/threonine motif in the third cytoplasmic loop

BMC Pharmacology
Jean D DeupreeD B Bylund

Abstract

The mechanisms by which alpha-2 adrenergic receptors are down-regulated following chronic exposure to agonist are not well understood. Interestingly, the human alpha-2C receptor does not down-regulate, whereas the opossum alpha-2C receptor does down-regulate. A comparison of the amino acid sequence of the third intracellular loop of these two receptors shows that the opossum alpha-2C receptor contains a potential G protein-coupled receptor kinase (GRK)phosphorylation motif (EESSTSE) with four hydroxyl residues, whereas the human alpha-2C receptor motif only contains two hydroxyl residues (DESSAAAAE). Because a similar acidic serine-rich motif (EESSSSD) in the human alpha-2 adrenergic receptor has been demonstrated to be phosphorylated by GRK and all four serines are required for desensitization of the receptor, we sought to determine whether the EESSTSE sequence was involved in the down-regulation of the alpha-2C adrenergic receptor. Site-directed mutagenesis was used to mutate the opossum alpha-2C receptor to SSVA and AAVA in place of the SSTS wild-type sequence. Down-regulation experiments on CHO cells transfected with the receptors demonstrated that neither of the mutated receptors down-regulated following 24 h exposure to n...Continue Reading

Citations

Mar 15, 2006·The Journal of Pharmacology and Experimental Therapeutics·Aarti N DesaiDouglas C Eikenburg
May 29, 2009·International Urogynecology Journal and Pelvic Floor Dysfunction·Inka ScheerAbdul H Sultan
Jan 11, 2012·Nursing in Critical Care·Andrew Parry
Oct 1, 2004·The Journal of Pharmacology and Experimental Therapeutics·Aarti N DesaiDouglas C Eikenburg
Jun 12, 2004·The Journal of Pharmacology and Experimental Therapeutics·Aarti N DesaiDouglas C Eikenburg
May 8, 2007·Proceedings of the National Academy of Sciences of the United States of America·Cristina MolnarJose F de Celis

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