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 Resjournal_title
Cell and tissue researchauthors
Merks T,Schulze-Bonhage A,Wittkowski Wdoi
10.1007/BF00312830subject
Has Abstractpub_date
1993-08-01 00:00:00pages
287-91issue
2eissn
0302-766Xissn
1432-0878journal_volume
273pub_type
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