Abstract:
:An abundant, seven trans-membrane domain receptor related to the calcitonin receptor has been studied by a number of groups without identification of its ligand. A recent report claimed that the receptor was a type 1 CGRP receptor (Aiyar et al J. Biol. Chem. 271 11325-11329 (1996)). We have studied the equivalent rat sequence in transfected cells. When expressed in 293 cells the receptor interacts with CGRP and adrenomedullin with KD values of 1.2 nM for CGRP and 11 nM for adrenomedullin. Both ligands cause an elevation of intracellular cAMP with EC50 values of 4 nM and 20 nM respectively and these effects are inhibited by the antagonist CGRP8-37. The receptor is expressed at high levels in the pulmonary vascular endothelium. Both the pharmacological data and the localisation are consistent with the conclusion that the orphan receptor is a type J CGRP receptor. However, when expressed in COS-7 cells, no receptor activity could be demonstrated suggesting that 293 cells contain a factor necessary for functional receptor expression.
journal_name
J Mol Endocrinoljournal_title
Journal of molecular endocrinologyauthors
Han ZQ,Coppock HA,Smith DM,Van Noorden S,Makgoba MW,Nicholl CG,Legon Sdoi
10.1677/jme.0.0180267subject
Has Abstractpub_date
1997-06-01 00:00:00pages
267-72issue
3eissn
0952-5041issn
1479-6813journal_volume
18pub_type
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