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Cardiac expression of genes encoding putative adrenomedullin/calcitonin gene-related peptide receptors.

Recent studies have suggested that adrenomedullin (AM) may play a role in the pathophysiology of heart disease, though the specific cardiac receptors involved have not been defined. RT-PCR cloned fragments of three putative AM/calcitonin gene-related peptide (CGRP) receptors were used to established a quantitative RNase protection assay to identify and quantitate expression of receptor mRNAs in heart and in cardiac myocytes. Intact rat heart expressed mRNA encoding the putative AM/CGRP receptors RDC1 and CRLR at 37- and 15-fold higher levels, respectively, than the AM-selective receptor L1, with a qualitatively similar profile in cultured neonatal cardiac myocytes. The high level of expression of RDC1 and CRLR suggests that both AM and CGRP may have direct actions on the cardiac myocyte via common receptors that can interact with either ligand.