Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
THE NEUROENDOCRINE CONTROL OF CLOCK-TIMED GONADOTROPIN-RELEASE IN THEFEMALE SYRIAN-HAMSTER - ROLE OF SEROTONIN
Autore:
OGILVIE KM; STETSON MH;
Indirizzi:
SALK INST,CLAYTON FDN LABS PEPTIDE BIOL,POB 85800 SAN DIEGO CA 91286 UNIV DELAWARE,DEPT BIOL NEWARK DE 19716
Titolo Testata:
Journal of Endocrinology
fascicolo: 1, volume: 155, anno: 1997,
pagine: 107 - 119
SICI:
0022-0795(1997)155:1<107:TNCOCG>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
FOLLICLE-STIMULATING-HORMONE; MICRODISSECTED BRAIN-AREAS; MALE GOLDEN-HAMSTERS; AGE-RELATED-CHANGES; LUTEINIZING-HORMONE; 5-HYDROXYINDOLEACETIC ACID; SUPRACHIASMATIC NUCLEI; MEDIAN-EMINENCE; ETHER STRESS; INTRAVENTRICULAR-INJECTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
89
Recensione:
Indirizzi per estratti:
Citazione:
K.M. Ogilvie e M.H. Stetson, "THE NEUROENDOCRINE CONTROL OF CLOCK-TIMED GONADOTROPIN-RELEASE IN THEFEMALE SYRIAN-HAMSTER - ROLE OF SEROTONIN", Journal of Endocrinology, 155(1), 1997, pp. 107-119

Abstract

We hypothesized that rhythms in hypothalamic serotonergic activity were permissive to daily and estrous cycle-related rhythms of LH, FSH and prolactin (PRL). In the Syrian hamster, proestrus (PRO) is characterized by a surge of LH, FSH and PRL; diestrus (DIE) by low LH and FSH and a small surge of PRL, while in photoperiod-induced anestrous (PIA) animals there is a surge of LH and FSH and low PRL. Turnover rates of serotonin (5HT) in four brain areas were determined for the three reproductive states at 2-h intervals. Turnover in the preoptic area and arcuate nuclei did not change, indicating that 5HT projections to these regions probably do not control LH, FSH or PRL release. Serotonin turnover in the median eminence (ME) was elevated at 0600 h in PIA females, at 0600 h, 0800 h, and 1400 h on DIE and at 0600 h and 2200 h on PRO. Since the pattern of 5HT turnover in the ME is different during eachof the three reproductive states, 5HT in this area is likely not crucial to the control of LH, FSH and PRL. Turnover of 5HT also did not change in the suprachiasmatic nuclei (SCN) of PRO or PIA animals. However, 5HT turnover rates in the SCN were elevated at 1200 h, 2000 h, and 2400 h on DIE. The correlation of high 5HT turnover in the SCN of DIE but not PRO and PIA animals suggested that elevated serotonergic activity in the SCN is part of the mechanism by which the gonadotropin surge is prevented on DIE. To test this, PRO and DIE hamsters were injected with 5HT receptor ligands. Administration of a 5HT agonist attenuated the PRO surge of LH and blocked the surge of PRL. In contrast, administration of two 5HT antagonists failed to elicit a surge of LH in DIEand phenobarbital-blocked PRO females, an indication that other mechanisms also contribute to inhibition of gonadotropin and PRL surges.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 15:43:12