Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Seasonal variations of in vivo and in vitro melatonin production in a passeriform bird, the house sparrow (Passer domesticus)
Autore:
Brandstatter, R; Kumar, V; Vant Hof, TJ; Gwinner, E;
Indirizzi:
Max Planck Soc, Res Ctr Ornithol, Dept Biol Rhythms & Behav, D-82346 Andechs, Germany Max Planck Soc Andechs Germany D-82346 & Behav, D-82346 Andechs, Germany
Titolo Testata:
JOURNAL OF PINEAL RESEARCH
fascicolo: 2, volume: 31, anno: 2001,
pagine: 120 - 126
SICI:
0742-3098(200109)31:2<120:SVOIVA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
COTURNIX-COTURNIX-JAPONICA; JAPANESE-QUAIL; PINEAL-GLAND; CIRCADIAN SYSTEM; 2-IODOMELATONIN BINDING; PHOTOPERIODIC CONTROL; LUTEINIZING-HORMONE; RHYTHMS; PLASMA; SECRETION;
Keywords:
annual rhythm; daily rhythm; in vitro; in vivo; melatonin; organ culture; photoperiod;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Brandstatter, R Max Planck Soc, Res Ctr Ornithol, Dept Biol Rhythms & Behav, Von der Tann Str 7, D-82346 Andechs, Germany Max Planck Soc Von der TannStr 7 Andechs Germany D-82346
Citazione:
R. Brandstatter et al., "Seasonal variations of in vivo and in vitro melatonin production in a passeriform bird, the house sparrow (Passer domesticus)", J PINEAL R, 31(2), 2001, pp. 120-126

Abstract

Melatonin, released from the pineal gland, is an important signal within the circadian pacemaking system of passeriform birds. Until now, seasonal variations in melatonin production have only been examined in a few avian species and the role of melatonin in the regulation of annual rhythms in birdsis unclear. We investigated plasma melatonin in a group of house sparrows kept in an outside aviary in spring (March/April), summer (May/June), autumn (September/October), and winter (December/January). The durations of elevated melatonin values mirrored the seasonal changes in night length to a certain degree, the melatonin signal being longest in winter and shortest in summer. Additionally, plasma melatonin peak amplitudes differed significantly among seasons, with highest values in spring and summer and lowest values in winter. Cultured explanted pineal glands obtained from animals in winter and summer showed patterns of in vitro melatonin release comparable to in vivo circulating melatonin with different durations of elevated melatoninand peak amplitude values. These data indicate that the circadian pacemaking system of the house sparrow changes properties seasonally, either as a result of endogenous mechanisms or in response to environmental conditions. These properties are maintained in the pineal gland even after isolation from the animal.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 12:17:51