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Titolo:
Effects of third ventricle injection of norepinephrine analogue on LH secretion of the non-laying SIJI goose
Autore:
Yang, PX; Cheng, ZY; Watanabe, G; Taya, K;
Indirizzi:
Tokyo Univ Agr & Technol, Vet Physiol Lab, Tokyo 1838509, Japan Tokyo UnivAgr & Technol Tokyo Japan 1838509 l Lab, Tokyo 1838509, Japan Zhejiang Univ, Dept Anim Sci, Hangzhou 310029, Peoples R China Zhejiang Univ Hangzhou Peoples R China 310029 ou 310029, Peoples R China
Titolo Testata:
ENDOCRINE JOURNAL
fascicolo: 1, volume: 47, anno: 2000,
pagine: 7 - 12
SICI:
0918-8959(200002)47:1<7:EOTVIO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
GONADOTROPIN-RELEASING HORMONE; COTURNIX-COTURNIX-JAPONICA; LUTEINIZING-HORMONE; OVARIECTOMIZED RAT; INVOLVEMENT; CATECHOLAMINES; HYPOTHALAMUS; MECHANISMS; INVITRO; PLASMA;
Keywords:
goose; norepinephrine analogue; phentolamine; yohimbine; LH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Taya, K Tokyo Univ Agr & Technol, Vet Physiol Lab, 3-5-8 Saiwai Cho, Tokyo1838509, Japan Tokyo Univ Agr & Technol 3-5-8 Saiwai Cho Tokyo Japan 1838509 pan
Citazione:
P.X. Yang et al., "Effects of third ventricle injection of norepinephrine analogue on LH secretion of the non-laying SIJI goose", ENDOCR J, 47(1), 2000, pp. 7-12

Abstract

The effect of norepinephrine analogue (NA) and norepinephrine antagonists on luteinizing hormone releasing hormone (LHRH) secretion in geese was investigated by monitoring serum levels of LH. Twenty nonlaying geese were selected and randomly assigned to 4 groups of 5 each. The geese received a single intraventricular injection of saline (control), NA (12 mu g/6 mu l), phentolamine (1 mu g/6 mu l) plus NA or yohimbine (10 mu g/6 mu l). Phentolamine, a non-selective adrenoreceptor blocker was given 5 min before NA, but yohimbine, an alpha(2)-adrenoreceptor blocker, was delivered without NA injection. The results showed that serum levels of LH began to increase 20 min after injection of NA, and that high serum levels of LH were maintained until 105 min, followed by a decline to the basal level 125 min later. Significantly high levels of serum LH were observed at 50 and 105 min after the injection as compared with the respective control. Treatment with phentolamine completely blocked the stimulatory effect of NA on serum levels of LH in NA treated geese. Serum levels of LH increased by yohimbine treatment 5 minafter the injection and the high levels of serum LH were maintained until 125 min later. Five out of 8 points were significantly high as compared with their respective control values. The present study also suggested that there is presynaptic modulation in the alpha-noradrenergic neural pathways which mediate the release of LHRH, and that this modulation may be carried out by alpha(2)-adrenoreceptor blocker.

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Documento generato il 21/01/20 alle ore 07:40:19