[Effect of hypoxia on the concentration of nicotinamide coenzymes in the tissues of newborn rats].

The content of nicotinamide coenzymes (NAD, NAD-H, NADP, NADP-H) was studied in the brain, heart and liver tissue of the newborn rats kept in hypoxic gaseous medium with a 4% oxygen content for 2 1/2 hours. There was a marked reduction of NAD content, an accumulation of NAD-H and a more than two-fold fall of the NAD/NAD-H ratio particularly marked in the brain and heart. A reduction of the NADP-H values chiefly in the liver and of the general pool of NAD-phosphates in the tissues of the newborn rats under study occurred under the same conditions. The data obtained led to the conclusion that oxygen deficiency had a significant influence on the concentration and the ratio of the nicotinamide coenzymes in the tissues of newborn rats, that in its turn led to the changes in the level and the direction of the redox processes under the conditions of hypoxia.