Comparison of the expression of calcitonin receptor-like receptor (CRLR) and receptor activity modifying proteins (RAMPs) with CGRP and adrenomedullin binding in cell lines.
1. The calcitonin receptor-like receptor (CRLR) and specific receptor activity modifying proteins (RAMPs) together form receptors for calcitonin gene-related peptide (CGRP) and/or adrenomedullin in transfected cells. 2. There is less evidence that innate CGRP and adrenomedullin receptors are formed by CRLR/RAMP combinations. We therefore examined whether CGRP and/or adrenomedullin binding correlated with CRLR and RAMP mRNA expression in human and rat cell lines known to express these receptors. Specific human or rat CRLR antibodies were used to examine the presence of CRLR in these cells. 3. We confirmed CGRP subtype 1 receptor (CGRP(1)) pharmacology in SK-N-MC neuroblastoma cells. L6 myoblast cells expressed both CGRP(1) and adrenomedullin receptors whereas Rat-2 fibroblasts expressed only adrenomedullin receptors. In contrast we could not confirm CGRP(2) receptor pharmacology for Col-29 colonic epithelial cells, which, instead were CGRP(1)-like in this study. 4. L6, SK-N-MC and Col-29 cells expressed mRNA for RAMP1 and RAMP2 but Rat-2 fibroblasts had only RAMP2. No cell line had detectable RAMP3 mRNA. 5. SK-N-MC, Col-29 and Rat-2 fibroblast cells expressed CRLR mRNA. By contrast, CRLR mRNA was undetectable by Northern analysis in one source of L6 cells. Conversely, a different source of L6 cells had mRNA for CRLR. All of the cell lines expressed CRLR protein. Thus, circumstances where CRLR mRNA is apparently absent by Northern analysis do not exclude the presence of this receptor. 6. These data strongly support CRLR, together with appropriate RAMPs as binding sites for CGRP and adrenomedullin in cultured cells.
Choksi
Tejal
T
Department of Metabolic Medicine, Imperial College School of Medicine, Hammersmith Hospital, Du Cane Road, London W12 0NN.
Hay
Debbie L
DL
Legon
Stephen
S
Poyner
David R
DR
Hagner
Stefanie
S
Bloom
Stephen R
SR
Smith
David M
DM
D053607:Adrenomedullin; D000818:Animals; D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism*; D058286:Calcitonin Receptor-Like Protein; D002352:Carrier Proteins / Q000096:biosynthesis*; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000096:biosynthesis*; D006801:Humans; D010455:Peptides / Q000378:metabolism*; D011485:Protein Binding / Q000502:physiology; D051381:Rats; D058265:Receptors, Adrenomedullin; D018003:Receptors, Calcitonin / Q000096:biosynthesis*; D018000:Receptors, Peptide / Q000378:metabolism; D014157:Transcription Factors
C545578:CALCRL protein, human; D058286:Calcitonin Receptor-Like Protein; C545580:Calcrl protein, rat; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D010455:Peptides; D058265:Receptors, Adrenomedullin; D018003:Receptors, Calcitonin; D018000:Receptors, Peptide; D014157:Transcription Factors; C111777:ZMYM2 protein, human; D053607:Adrenomedullin; D015740:Calcitonin Gene-Related Peptide