NADPH-dependent lipid peroxidation and its effects on aminopyrine N-demethylation in subcellular fractions of human neonatal liver.

NADPH-dependent lipid peroxidation was determined in humans, using subcellular fractions of livers obtained from newborn infants. As reported for other species, activity was concentrated in the microsomal fraction and was similar to that found in the rat. High activity of lipid peroxidation induced by iron decreased aminopyrine N-demethylation and slightly reduced linearity time for the reaction. Compared with the rat, however, human microsomes were more resistant to the effects of lipid peroxidation. If liped peroxidation occurs in vivo it is unlikely to affect drug oxidation to any great degree in human infants.