[Possible role of free radicals in the transformations and mechanism of physiological action of vitamin D].

Deficiency of vitamine D is accompanied with a decrease of ESR signal intensity from g = 2.003, as well as of the signals with g = 1.94 and gav. = 2.25 in the liver and kidneys of young rats. Injection of 2.5 g ergocalciferole (vitamine D2) to these animals results in a complete or partial normalization of the intensity of these signals during 6--16 hrs and an increase of the ESR signal intensity from g = 2.003 in small intestine mucosa.