Effect of different photoperiods on the diurnal rhythm of 5-methoxytryptamine in the pineal gland of golden hamsters (Mesocricetus auratus).
J Neural Transm Gen Sect
; 83(3): 235-42, 1991.
Article
en En
| MEDLINE
| ID: mdl-2031712
ABSTRACT
This study tested the photo-dependency of the rhythmic synthesis of 5-methoxytryptamine (5-MT) in the pineal gland of golden hamsters. After pargyline administration, pineal 5-methoxytryptamine and melatonin were measured by HPLC in male golden hamsters kept under short and long photoperiod. In both photoperiodic regimes, a clear 5-MT rhythm was observed which fitted a sinusoidal function with high values occurring during the daytime and low values occurring during the night-time. The duration of the low night-time levels was clearly proportional to the length of the dark phase. A marked rhythm of melatonin synthesis was also seen with low daytime levels and high night-time values. An inverse relationship between 5-MT and melatonin levels was observed. Thus, after pargyline administration, the rhythms of 5-MT and melatonin in the pineal gland of golden hamsters are photoperiod-dependent and show a reciprocal relationship.
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Banco de datos:
MEDLINE
Asunto principal:
Glándula Pineal
/
5-Metoxitriptamina
/
Mesocricetus
/
Ritmo Circadiano
/
Luz
Límite:
Animals
Idioma:
En
Revista:
J Neural Transm Gen Sect
Año:
1991
Tipo del documento:
Article
País de afiliación:
Francia