[Age-related changes in metabolism of DNA precursors in patients with mastopathy].

The activity of thymidine kinase, thymidine phosphorylase, adenosine deaminase and 5'-nucleotedase of AMP was studied in tissues, blood serum and lymphocytes of 60 healthy females and 50 females with fibrocavernous mastopathy aged 23-70. It was revealed that age-related changes in the activity of thymidine kinase in blood serum reflect the analogous changes in enzyme activity in tissues of healthy women. A direct correlation was established between thymidine kinase activity and age both in healthy females and those with mastopathy.

[The effect of nicotinamide on the activity of the glutathione- glutathione reductase system in subcellular fractions of regenerating rat liver].

Experiments on white rats have shown that growth rates of the glutathione reductase activity and reduced glutathione concentration in the cytoplasmic fraction of the generating liver tissue and especially in the mitochondrial one are more pronounced with an increase of the nicotinamide dose from 50 mg/kg to 150 mg/kg, than after administration of nicotinamide in a dose of 300 mg/kg. Higher doses of nicotinamide (500 mg/kg) produce less pronounced changes in these parameters.