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Endocrinology Vol. 141, No. 2 505-512
Copyright © 2000 by The Endocrine Society

ARTICLES

Primary Structure and Function of Three Gonadotropin-Releasing Hormones, Including a Novel Form, from an Ancient Teleost, Herring1

Joachim Carolsfeld, James F. F. Powell2, Minkyu Park, Wolfgang H. Fischer, A. Grey Craig, John P. Chang, Jean E. Rivier and Nancy M. Sherwood

Department of Biology, University of Victoria (J.C., J.F.F.P., N.M.S.), Victoria, British Columbia, Canada V8W 2Y2; The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute (M.P., W.H.F., A.G.C., J.E.R.), La Jolla, California 92037; and the Department of Biological Sciences, University of Alberta (J.P.C.), Edmonton, Alberta, Canada T6G 2E9

Address all correspondence and requests for reprints to: Dr. N. M. Sherwood, Department of Biology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2. E-mail: nsherwoo{at}uvic.ca

The evolution of GnRH and the role of multiple forms within the brain are examined. Three forms of GnRH were purified from the brain of Pacific herring (Clupea harengus pallasi) and characterized using Edman degradation and mass spectrometry. Two forms correspond with the known structures of chicken GnRH-II and salmon GnRH that are found in many vertebrate species. The third form, designated herring GnRH (hrGnRH), has a primary structure of pGlu-His-Trp-Ser-His-Gly-Leu-Ser-Pro-Gly-NH2. This novel peptide is a potent stimulator of gonadotropin II and GH release from dispersed fish pituitary cells. The content of hrGnRH in the pituitary was 8-fold that of salmon GnRH and 43-fold that of chicken GnRH-II, which provides supporting evidence that hrGnRH is involved in the release of gonadotropin.

Herring is the most phylogenetically ancient animal in which three forms of GnRH have been isolated and sequenced. Our evidence suggests that the existence of three GnRHs in the brain of one species 1) is an ancestral condition for teleosts, 2) has the potential for separate regulation of the distinct GnRHs, and 3) may be an evolutionary advantage for refined control of reproduction in different environments.




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