Circadian changes in microtubules, synaptic ribbons and synaptic ribbon fields in the pinealocytes of the baboon (Papio ursinus).
Cell Tissue Res
; 217(2): 405-13, 1981.
Article
em En
| MEDLINE
| ID: mdl-7237536
ABSTRACT
In baboons kept under controlled lighting conditions, microtubules (MT) are readily seen in the perikaryal cytoplasm and in the perivascular processes of pinealocytes. A significant increase in the number of MT, single synaptic ribbons (SR) and the formation of synaptic ribbon fields (RF, i.e. organelles which consist of multiple dense rodlets or plates, and vesicles), occur during the dark phase of a circadian light-dark cycle. MT may act as "tracks" for the oriented flow of vesicles derived from the smooth endoplasmic reticulum, to cytoplasmic sites where RF are being formed. The origin of the dense rodlets of RF remains unknown. Structural differences between SR and RF indicate that the latter organelles are not directly involved in impulse propagation between adjacent baboon pinealocytes. RF may function as storage organelles for some of the pineal secretory products which are formed in large amounts during the dark phase.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Glândula Pineal
/
Sinapses
/
Ritmo Circadiano
/
Microtúbulos
Limite:
Animals
Idioma:
En
Revista:
Cell Tissue Res
Ano de publicação:
1981
Tipo de documento:
Article