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Titolo:
Effects of photoperiod on salmon GnRH mRNA levels in brain of castrated underyearling precocious male masu salmon
Autore:
Amano, M; Ikuta, K; Kitamura, S; Aida, K;
Indirizzi:
Natl Res Inst Aquaculture, Nikko Branch, Nikko, Tochigi 3211661, Japan Natl Res Inst Aquaculture Nikko Tochigi Japan 3211661 higi 3211661, Japan Univ Tokyo, Grad Sch Agr & Life Sci, Dept Aquat Biosci, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 , Dept Aquat Biosci, Tokyo 1138657, Japan
Titolo Testata:
GENERAL AND COMPARATIVE ENDOCRINOLOGY
fascicolo: 1, volume: 115, anno: 1999,
pagine: 70 - 75
SICI:
0016-6480(199907)115:1<70:EOPOSG>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
GONADOTROPIN-RELEASING-HORMONE; ONCORHYNCHUS-MASOU; RAINBOW-TROUT; IMMUNOCYTOCHEMICAL LOCALIZATION; ONTOGENIC DEVELOPMENT; CHUM SALMON; MATURATION; NEURONS; SYSTEMS; PEPTIDE;
Keywords:
salmon GnRH; in situ hybridization; masu salmon; castration; photoperiod;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Amano, M Kitasato Univ, Sch Fisheries Sci, Sanriku, Iwate 0220101, Japan Kitasato Univ Sanriku Iwate Japan 0220101 , Iwate 0220101, Japan
Citazione:
M. Amano et al., "Effects of photoperiod on salmon GnRH mRNA levels in brain of castrated underyearling precocious male masu salmon", GEN C ENDOC, 115(1), 1999, pp. 70-75

Abstract

Previous studies have suggested that activation of salmon gonadotropin-releasing hormone (sGnRH)-producing neurons is induced by the combined effectsof photoperiod and steroid hormones in underyearling males of the masu salmon, Oncorhynchus masou. The present study further assesses the effects of photoperiod and steroid hormones on sGnRH synthetic activity and examines the changes in sGnRH mRNA levels in the brains of castrated underyearling precocious male masu salmon by manipulating the photoperiod for 60 days from August through October. In castrated males in which plasma testosterone levels decreased to low levels, sGnRH mRNA levels in the preoptic area (POA) increased under a short photoperiod (8L-16D), whereas they remained at low levels under a long photoperiod (16L-8D) for a 2-month duration. In sham-operated males, sGnRH mRNA levels in the ventral telencephalon and those in the POA increased in October with testicular maturation even under a long photoperiod with a delay of 1 month compared with the short photoperiod group. These results suggest that preoptic sGnRH-producing neurons receive short photoperiodic signals and that either short photoperiod or steroid hormone secretion is required for the activation of sGnRH synthesis in underyearling precocious male masu salmon. (C) 1999 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 19:37:16