[Seasonal changes in the influence of prostaglandin E2 on corticosteroid biosynthesis by rabbit adrenals]

The biosynthesis of corticoids from exogenic tritated progesteron with and without addition of progstaglandin E2 in incubation medium was studied in rabbits in spring and in summer. C-14 inclusion into aldosteron, cortisone, and 11-dehydrocorticosterone in the spring rabbits was considerably higher than in the summer ones. Prostaglandin E2 suppressed the biosynthesis of the final fraction of corticosteroids in the spring rabbits and did not change the C-14 inclusion into corticosteroids in summer.