header logo image header logo text
Downloads Login
General Information
ZFIN ID: ZDB-PUB-080902-28
Newly-identified receptors for PHI and GHRH-like peptide in zebrafish help to elucidate the mammalian secretin superfamily
Wu, S., Roch, G., Cervini, L., Rivier, J., and Sherwood, N.
Date: 2008
Source: Journal of molecular endocrinology   41(5): 343-366 (Journal)
Registered Authors: Sherwood, Nancy M.
Keywords: none
MeSH Terms:
  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Growth Hormone-Releasing Hormone/genetics
  • Growth Hormone-Releasing Hormone/metabolism*
  • Humans
  • Molecular Sequence Data
  • Peptide PHI/genetics
  • Peptide PHI/metabolism*
  • Peptides/genetics
  • Peptides/metabolism
  • Phylogeny
  • Receptors, Cell Surface/classification
  • Receptors, Cell Surface/genetics
  • Receptors, Cell Surface/metabolism*
  • Secretin/classification
  • Secretin/genetics
  • Secretin/metabolism*
  • Sequence Alignment
  • Tissue Distribution
  • Zebrafish/genetics
  • Zebrafish/metabolism*
  • Zebrafish Proteins/classification
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism
PubMed: 18757498 Full text @ J. Mol. Endocrinol.
A group of ten hormones in humans are structurally related and known as the secretin superfamily. These hormones bind to G-protein-coupled receptors that activate the cAMP pathway and are clustered as the secretin or B family. We used molecular techniques to clone two full length receptor cDNAs in zebrafish, which were analyzed for amino acid sequence and ligand-binding motifs, phylogenetic position, synteny, tissue expression, functional response, and signaling pathway. Evidence is provided that the two cDNAs are the peptide histidine-isoleucine (PHI) receptor and PRP receptor, which is known as growth hormone-releasing hormone-like peptide (GHRH-LP) receptor in non-mammals. Further we cloned a zebrafish cDNA encoding the peptides PHI and vasoactive intestinal peptide (VIP). The PHI-R cDNA, transfected into COS7 cells, responded to zebrafish PHI in a sensitive and dose-dependent manner (EC50 = 1.8 X 10-9M) but not to PACAP and VIP. The GHRH-LP receptor responded to both zebrafish GHRH-LP1 and GHRH with a 3.5 fold greater response to the former. For comparison, two zebrafish receptors (PAC1 & VPAC1) and two human receptors (VPAC2 & GHRH) were tested with human and/or zebrafish peptides. Unexpectedly, zebrafish VIP activated its PAC1 receptor suggesting that in evolution, PAC1 is not always a specific receptor for PACAP. We conclude that zebrafish, like goldfish, have a specific receptor for PHI and GHRH-LP. Our evidence that zebrafish PHI is more potent than human PHM in activating the human VPAC2 receptor (EC50 = 7.4 X 10-9M) supports our suggestion that the VPAC2R and PHI-R shared a common ancestral receptor.