DIFFERENTIAL DISTRIBUTION AND RESPONSE TO EXPERIMENTAL SEXUAL-MATURATION OF 2 FORMS OF BRAIN GONADOTROPIN-RELEASING-HORMONE (GNRH) IN THE EUROPEAN EEL, ANGUILLA-ANGUILLA

被引:42
作者
DUFOUR, S
MONTERO, M
LEBELLE, N
BASSOMPIERRE, M
KING, JA
MILLAR, RP
PETER, RE
FONTAINE, YA
机构
[1] GROOTE SCHUUR HOSP,CAPE TOWN,SOUTH AFRICA
[2] UNIV ALBERTA,DEPT ZOOL,EDMONTON T6G 2E9,ALBERTA,CANADA
[3] UNIV CAPE TOWN,SCH MED,DEPT CHEM PATHOL,MRC,REGULATORY PEPTIDES RES UNIT,CAPE TOWN,SOUTH AFRICA
关键词
FISH; ANGUILLA; REPRODUCTION; NEUROENDOCRINOLOGY; GNRH; MGNRH; CGNRH-II; STEROID FEEDBACK;
D O I
10.1007/BF00004555
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Using specific radioimmunoassays for the two GnRH molecular forms present in the European eel, Anguilla anguilla, (mGnRH and cGnRH II), we compared their distributions in the pituitary and different parts of the brain of female silver eels, as well as the modifications of their levels in experimentally matured female eels (treated with carp pituitary extract). In control eels, mGnRH levels were higher than cGnRH II levels in the pituitary, olfactory lobes and telencephalon, di- and mesencephalon, while the opposite was found in the posterior part of the brain (met- and myelencephalon). Experimental sexual maturation of the gonads significantly increased mGnRH levels in the pituitary and anterior parts of the brain; such a positive effect was not observed on the low cGnRH II levels, which were, in contrast, reduced. These data indicate that the positive feedback of gonadal hormones on GnRH, that we previously demonstrated, would specifically affect the mGnRH form. The differential distribution and control of mGnRH and cGnRH II suggest that these two forms have different physiological roles in the eel. The large increase in mGnRH during sexual maturation suggests the prime implication of this form in the neuroendocrine control of reproduction.
引用
收藏
页码:99 / 106
页数:8
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