[Ezymohistochemical study of the early stages of carcinogenesis in the rat peripheral nervous system]

Early blastomatous changes in the peripheral nervous system induced by transplacental N-nitroso-N-ethylurea exposure were manifested in lemmoblasts proliferates, observed starting from the 14th day of the postnatal period in rats. The proliferates showed the increased activity of ortho-phosphoric and carbonic esters hydrolysis enzymes pentose cycle, ultimate glycolysis and the reduced citric acid cycle, tissue respiration, the synthesis of aminoacids, folic acid, nucleoproteids precursors, and a sharp suppression of oxidative desamination. Such profile of enzymic provision was retained in neurinomas developed 6 months following the postnatal period. Based on the data obtained, it is concluded that the process of glial cells malignant transformation is terminated long before the appearance of malignant neoplasms detected macroscopically.