Abstract
The ultrastructure of the prolactin cells in nine-spined sticklebacks (Pungitius pungitius L.) with and without large pituitary cysts was compared. Prolactin cells from animals with cysts were less active as regards hormone synthesis and release than those from animals without cysts. Rough endoplasmic reticulum, mitochondria, Golgi apparatus and exocytotic figures were all more prominent in animals without cysts. Lysosomes and mature secretory granules were more plentiful in animals with cysts. The correlation between inactive prolactin cells and pituitary cysts argues against the hypothesis that cysts store prolactin released by holocrine secretion. It is more likely that the origin of cysts from degenerating cells signals extreme inactivity in the rostral pars distalis.
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