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Sex Steroid Regulation of Vasopressin Levels Secreted by hNT Neurons*

9.9

Testosterone
(18 ng/ml)

6

3.6

24

8.1

48

17.4

table 1

In order to demonstrate that sex steroids increase neuronal protein synthesis of the neuropeptide vasopressin, Stratagenes hNT Neurons were cultured with various physiological and supraphysiological levels of estrogen, testosterone and dihydrotestosterone (table 1). Cell culture media was collected at 6, 24 and 48 hours, and vasopressin was quantitated by radioimmunoassay (RIA). The more potent androgen, dihydrotestosterone, demonstrated the most immediate effect on vasopressin synthesis. High doses of testosterone had the greatest overall effect on vasopressin synthesis, while estrogen treatment mimicked control neurons. Neurons were also incubated with [35S]methionine and steroids to monitor sex steroid alterations in protein synthesis. Dihydrotestosterone appeared to be the most potent initiator of protein synthesis in the neurons.

These preliminary results
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