Abstract
Effects of β-oestradiol on thymidine kinase activity in the immature oviduct of the newt Pleurodeles waltlii Michah. Young female newts ( Pleurodeles waltlii Michah) were reared in water containing 17 β-oestradiol (5 mg/liter) dissolved in ethyl alcohol. On the third day of hormonal treatment, the specific activity of thymidine kinase begins to increase, becoming maximal on the sixth day when it reaches five times the control values. It then decreases, due to the rise in the protein content of the oviduct, which occurs after the sixth day of treatment. Oestradiol exerts its effect on the specific activity of thymidine kinase more rapidly than on protein synthesis in general. An autoradiographic study of the same material shows that the hormonal treatment markedly increases the incorporation of tritiated thymidine in the nuclei of the immature oviduct and induces several consecutive mitotic cycles.
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