Photoperiod-dependent changes in exocytotic activity in the hypophyseal pars tuberalis of the Djungarian hamster, Phodopus sungorus.

Abstract:

:The pars tuberalis of the hypophysis of the Djungarian hamster, Phodopus sungorus, was investigated with regard to secretory activity by applying the tannic acid-Ringer perfusion technique. Two groups were maintained under long photoperiods (16 h light: 8 h dark) or short photoperiods (8 h light: 16 h dark), respectively. Perfusion with tannic acid showed that specific pars tuberalis cells release some of their secretory granules as indicated by typical exocytotic figures. The percentage of cells displaying exocytotic activity was significantly higher in the pars tuberalis of hamsters kept under long photoperiods. The number of exocytotic figures per single cell was not increased. These results provide further evidence for a secretory activity of the pars tuberalis and support the hypothesis of its involvement as a mediator between photoperiodic stimuli and the endocrine system.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Merks T,Schulze-Bonhage A,Wittkowski W

doi

10.1007/BF00312830

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

287-91

issue

2

eissn

0302-766X

issn

1432-0878

journal_volume

273

pub_type

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