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Kuwasako, K. et al.

Kuwasako, Kitamura, Nagoshi, Eto,

Novel calcitonin-(8-32)-sensitive adrenomedullin receptors derived from co-expression of calcitonin receptor with receptor activity-modifying proteins.

We tested whether heterodimers comprised of calcitonin (CT) receptor lacking the 16-amino acid insert in intracellular domain 1 (CTR(I1-)) and receptor activity- modifying protein (RAMP) can function not only as calcitonin gene-related peptide (CGRP) receptors but also as adrenomedullin (AM) receptors. Whether transfected alone or together with RAMP, human (h)CTR(I1-) appeared mainly at the surface of HEK-293 cells. Expression of CTR(I1-) alone led to significant increases in cAMP in response to hCGRP or hAM, though both peptides remained about 100-fold less potent than hCT. However, the apparent potency of AM, like that of CGRP, approached that of CT when CTR(I1-) was co-expressed with RAMP. CGRP- or AM-evoked cAMP production was strongly inhibited by salmon CT-(8-32), a selective amylin receptor antagonist, but not by hCGRP-(8-37) or hAM-(22-52), antagonists of CGRP and AM receptors, respectively. Moreover, the inhibitory effects of CT-(8-32) were much stronger in cells co-expressing CTR(I1-) and RAMP than in cells expressing CTR(I1-) alone. Co-expression of CTR(I1-) with RAMP thus appears to produce functional CT-(8-32)-sensitive AM receptors.[1]

References

Novel calcitonin-(8-32)-sensitive adrenomedullin receptors derived from co-expression of calcitonin receptor with receptor activity-modifying proteins. Kuwasako, K., Kitamura, K., Nagoshi, Y., Eto, T. Biochem. Biophys. Res. Commun. (2003) [Pubmed]

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