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The study made by histochemistry shows that the delta5-3 beta-hydroxysteroid-dehydrogenase (delta5-3 beta-HSDH) activity which is positive in the fresh placental tissue disappears after 24 h of culture but is maintained much longer if culture medium is supplemented with human chorionic gonadotropin (15 UI of HCG). The biochemical study confirms the delta5-3 beta-HSDH activity decrease during the first 24 h of culture. The enzymatic activity is restored during the following six days and this phenomenon is stimulated by the addition of HCG in the culture medium.
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