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Earlier studies [8] demonstrated the morphological differences between chorionic villi of central and peripheral regions in placentones. Histochemical and biochemical investigations [9] revealed results corresponding to the morphological findings, that is regionally difFerentiated activity of alkaline phosphatase. They showed that centrally situated villi, which demonstrate a lower degree of maturity than peripherally situated ones, also reacted like less mature villi in respect to activity of alkaline phosphatase. The purpose of this paper is to examine whether enzymes of steroid-biosynthesis also demonstrate regional differences concerning their own specific activities. This concerns, above all, aromatising enzyme Systems and 17s-hydroxysteroid-oxidoreductase. For this reason, we measured the in vitro transformation of 2d-4-androstendione to testosterone and to oestrone/oestradiol-17j8 by microsomes fromtissue of central and peripheral regions of the placentone.

Regionally different stetoid-biosynthesis within materno-fetal circulation units (placentones) of mature human placentas