Abstract
Abstract Analytical histochemical analyses of prolactin (PC) and Stannius corpuscle (SC) cells of brook trout exposed to acidified water (pH 4.5) for 2, 3, and 5 days were undertaken to ascertain the secretory response pattern of these endocrine glands to acid stress. A 2-day acid exposure caused a transient decrease in RNA synthesis and depletion of secretory material in prolactin cells as indicated by cellular shrinkage, decreased pituitary acid proteins, lower nuclear and cytoplasmic RNA levels, and decreased incorporation of [3H]uridine. A compensatory increase of RNA and an increase in protein occurred in the 3- and 5-day exposed groups which also exhibited increased skin mucification. Activation of Stannius corpuscle secretory processes was observed in 2-, 3-, and 5-day exposed trout using cell hypertrophy, increased RNA, and protein as indices of augmented synthesis and secretion by SC cells. It was established that bovine prolactin injections caused cytomorphological changes in PC but not in SC cells. The overall findings are in accord with the concept that these two tissues have independent but synergistic roles in osmoregulation during acclimation to acid stress.
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