Abstract
Neutralized acid extract of median eminence from male rats, female turtles ( Pseudemys scripta elegans), and snakes ( Natrix taxispilota) of undetermined sex stimulated the release of prolactin by turtle anterior pituitary explants in organ culture or in short-term incubation. Rat, turtle, or snake cortical extract did not affect prolactin secretion in vitro. The prolactin-releasing activity of both turtle and snake median eminence extract was detectable during the first 4 hr of a 12-hr incubation and showed consistent stimulation throughout the entire incubation period. Both of the reptilian median eminence extracts also enhanced synthesis of prolactin by the turtle anterior pituitary gland in vitro. The results support the hypothesis that the reptilian median eminence contains a factor which stimulates the secretion and synthesis of prolactin and that the prolactin-stimulating factor may be indigenous to the hypothalami of a wider range of reptilian species.
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