Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
LESIONS IN THE ANTERIOR BED NUCLEUS OF THE STRIA TERMINALIS IN SYRIAN-HAMSTERS BLOCK SHORT-PHOTOPERIOD-INDUCED TESTICULAR REGRESSION
Autore:
RAITIERE MN; GARYFALLOU VT; URBANSKI HF;
Indirizzi:
OREGON REG PRIMATE RES CTR,DIV NEUROSCI,505 NW 185TH AVE BEAVERTON OR97006 OREGON REG PRIMATE RES CTR,DIV NEUROSCI BEAVERTON OR 97006 OREGON HLTH SCI UNIV,DEPT PHYSIOL & PHARMACOL PORTLAND OR 97201
Titolo Testata:
Biology of reproduction
fascicolo: 4, volume: 57, anno: 1997,
pagine: 796 - 806
SICI:
0006-3363(1997)57:4<796:LITABN>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
HORMONE-RELEASING HORMONE; MALE GOLDEN-HAMSTERS; HYPOTHALAMIC PARAVENTRICULAR NUCLEUS; PHASEOLUS-VULGARIS-LEUKOAGGLUTININ; MEDIAL PREOPTIC AREA; PRECOCIOUS PUBERTY; OLFACTORY BULBS; CARDIOVASCULAR-RESPONSES; GONADOTROPIN-SECRETION; AMYGDALOID NUCLEUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
64
Recensione:
Indirizzi per estratti:
Citazione:
M.N. Raitiere et al., "LESIONS IN THE ANTERIOR BED NUCLEUS OF THE STRIA TERMINALIS IN SYRIAN-HAMSTERS BLOCK SHORT-PHOTOPERIOD-INDUCED TESTICULAR REGRESSION", Biology of reproduction, 57(4), 1997, pp. 796-806

Abstract

To elucidate the neural circuitry involved in the photoperiodic control of seasonal reproduction, adult male Syrian hamsters, previously housed under long photoperiods (LD; 14 h of light per day), received sham or bilateral radiofrequency-current lesions directed towards one of three anterior-to-posterior levels of the bed nucleus of the stria terminalis (BNST; far anterior, anterior, posterior). They were then transferred to a short photoperiod (SD; 6 h of light per day) for 12 wk, and their testicular weights and plasma FSH, LH, and testosterone concentrations were determined. All of these parameters became markedly inhibited in the sham-lesioned SD controls and also in the far anterior and posterior BNST lesioned groups. In contrast, this inhibitory response to SD was completely abolished in 8 of 14 animals that had receivedanterior BNST lesions; only in these 8 animals did the lesion encompass the lateral aspect of the anterior BNST. In a second experiment, hamsters that had previously been exposed to SD for 12 wk in order to induce testicular regression were lesioned in the anterior BNST and for the next 4 weeks were either exposed to LD or further maintained in SD. However, in neither case did the anterior BNST lesions perturb the normal photoperiodic response. Paired testes weights and plasma FSH, LH, and testosterone concentrations at 4 wk did not differ significantly(p > 0.05) between the lesioned animals and their respective sham-lesioned LD and SD controls, which, respectively, showed recrudescence ofthe reproductive axis or remained in a regressed condition. Taken together, the results suggest that lateral aspects of the anterior BNST contain a cell group that is critical for perception of the SD neuro-inhibitory signal; obliteration of this cell group interrupts the transmission of the inhibitory signal to the reproductive axis but does not directly stimulate it.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 00:43:11