[The dynamic biosynthesis of nicotinamide coenzymes from nicotinamide and nicotinic acid in rat tissues].

Dynamics of nicotinamide coenzyme biosynthesis in rat tissues has been studied systematically with previous injection of two main precursors nicotinic acid and nicotinamide (50 mg/100 g of weight. This process is characterized by exact tissue specificity. As a precursor of NAD-biosynthesis nicotinamide was used more intensively in the liver and brain tissues. In the mucous tissue of intestine nicotinic acid was utilized more intensively. An increase in the NADP+ content in tissues with high level of NAD+ biosynthesis is limited as a result of competition between these two processes for the intracellular ATP level.