Regulation of secretory granule formation in chronically hypersecretory melanotrophs in the rat pituitary.

Abstract:

:The formation of secretory granules in chronically hypersecretory melanotrophs in the rat pituitary was studied. Hypersecretion was induced by treatment with the dopamine antagonist haloperidol (1.5 mg/kg daily for 7 days), which releases the normal neural dopaminergic inhibition of secretion from the melanotroph. Morphometric analysis showed a 100% increase in the volume fraction of granular endoplasmic reticulum after haloperidol treatment, while the volume fractions of electron-dense granules, electron-lucent granules and the Golgi apparatus were unaltered. The mean diameter of the mature secretory granules was increased by 10%, indicating a 30% increase in mean granule volume. A similar increase in diameter was observed in condensing granules within the Golgi area. With earlier results on the effect of chronic inhibition the study shows that a main adaptive response of the melanotroph to altered secretory conditions is a change in the volume of the secretory granules, regulated by a mechanism that operates at an early stage of granule formation.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Bäck N,Soinila S

doi

10.1007/BF00319432

subject

Has Abstract

pub_date

1994-02-01 00:00:00

pages

339-44

issue

2

eissn

0302-766X

issn

1432-0878

journal_volume

275

pub_type

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