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BOR - Papers in Press, published online ahead of print October 4, 2002.
Biol Reprod 2002, 10.1095/biolreprod.102.004572
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Submitted February 14, 2002
Returned for revision March 19, 2002
Accepted July 1, 2002

Neuroendocrinology


Expression of Pejerrey Gonadotropin-Releasing Hormone in Three Orders of Fish

G. M. Somoza 1*, D. W. Lescheid 2, L. A. Miranda 1, F. L. Lo Nostro 3, L. Magliulo-Cepriano 4, A. D. Montaner 5, M. P. Schreibman 4, J. E. Rivier 6, N. M. Sherwood 2
1 IIB-INTECH (UNSAM-CONICET)
2 University of Victoria
3 Universidad de Buenos Aires
4 Brooklyn College of the City University of New York
5 Fundacion Pablo Cassara
6 The Salk Institute

* To whom correspondence should be addressed. E-mail: somoza{at}intech.gov.ar.

Abstract

Gonadotropin-releasing hormone (GnRH) molecular variants were characterized by reverse-phase, high performance liquid chromatography (RP-HPLC) from brain extracts of fish in three different orders: Synbranchiformes (swamp eel Synbranchus marmoratus); Cyprinidontiformes (platyfish Xiphophorus maculatus and green swordtail Xiphophorus helleri); and Atheriniformes (Patagonia pejerrey Odontesthes hatchery). Also, pituitary gland extracts from the pejerrey Odontesthes bonariensis (Atheriniformes) were characterized. Eluted fractions were tested in radioimmunoassays (RIAs) with antisera specific to GnRH, including both antisera that detected only one form of GnRH and those that detected several forms. The results show that brain extracts obtained from all species contained the same three molecular forms of GnRH, which were immunologically and chromatographically indistinguishable from chicken GnRH-II, pejerrey GnRH and salmon GnRH. This study supports the hypothesis that the expression of these three forms is common in different fish orders and that pjGnRH is the main regulator of pituitary function in these fishes.



Key words: Anterior pituitary • Central Nervous System • Gonadotropin-releasing hormone • Hypothalamic hormones • Neuropeptides


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B. Levavi-Sivan, H. Safarian, H. Rosenfeld, A. Elizur, and A. Avitan
Regulation of Gonadotropin-Releasing Hormone (GnRH)-Receptor Gene Expression in Tilapia: Effect of GnRH and Dopamine
Biol Reprod, June 1, 2004; 70(6): 1545 - 1551.
[Abstract] [Full Text] [PDF]


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