Journal
PEPTIDES
Volume 27, Issue 5, Pages 1104-1109Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.peptides.2005.06.034
Keywords
C-RFa; PrRP; prolactin; pituitary; mRNA; gills; chloride cells
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We administered prolactin-releasing peptide (PrRP) or anti-PrRP antiserum to goldfish in, fresh water and analyzed their effects on prolactin and osmoregulatory mechanisms. The pituitary mRNA level of prolactin increased by PrRP but decreased by anti-PrRP. The rate of water inflow in the gills decreased by PrRP and increased by anti-PrRP, showing that PrRP restricts branchial water permeability, as also restricted by prolactin. PrRP also expanded the mucous cell layers on the scales, which may restrict efficiently water inflow by the mucous system. Eventually, the plasma osmotic pressure decreased by anti-PrRP. We conclude that PrRP is essential to maintain prolactin levels and osmotic balance in fresh water. (c) 2006 Elsevier Inc. All rights reserved.
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