English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We determined whether dehydroepiandrosterone (DHA) and androstenedione (A) were converted to testosterone (T) by the midgestation primate fetal testis in the absence of gonadotropins. Testes from six baboon (Papio anubis) fetuses, obtained by cesarean section at Day 100-107 of gestation (term = Day 184) were dispersed with 0.2% collagenase. Cells (1.1 X 10(6)) were suspended in 4 ml Eagle's Minimum Essential Medium containing penicillin/streptomycin (MEM) and incubated for 20 h (37 degrees C) with or without DHA, A, pregnenolone (P5), 17 alpha-hydroxypregnenolone (17OH-P5), progesterone (P4) or 17 alpha-hydroxyprogesterone (17OH-P4). Concentrations of T, A, P4, and 17OH-P4 in the medium and cells were measured by radioimmunoassay. Mean secretions of T and A, in the absence of exogenous substrates, were 0.5 +/- 0.2 and 0.8 +/- 0.3 ng/mg testis, respectively, and were not elevated by human chorionic gonadotropin (hCG). Addition of DHA at 100, 500, or 1000 ng/4 ml increased (p less than 0.05) the production of T to 6 +/- 0.6, 33 +/- 10, and 64 +/- 26 ng/mg testis and the production of A to 13 +/- 5.5, 54 +/- 10, and 67 +/- 22 ng/mg testis, respectively. Similarly, addition of A at 100, 500, or 1000 ng/4 ml increased (p less than 0.05) production of T to 27 +/- 5.3, 155 +/- 29, and 254 +/- 79 ng/mg testis, respectively. In contrast, production of T and A remained near baseline concentrations when cells were incubated with 1000 ng/4 ml of P5, P4, 17OH-P5, or 17OH-P4.(ABSTRACT TRUNCATED AT 250 WORDS)

Testosterone Production by Collagenase-Dispersed Cells from Baboon Fetal Testis1