[Differences in the antigenic structure of chromatin from the liver and hepatoma cells in the rat]

Differences in antigenic structure of chromatin from normal and tumour cells were studied using rabbit antibodies against chromatin of the rat liver, Zaidela ascite hepatoma and solid hepatoma 27 cells. It is shown that carcinogenesis is accompanied by loss of a part of normal liver antigens. All the antigens which are not indicated in solid hepatoma were not detected in ascite tumour too. The latter is deficient in some antigens common for the normal liver and solid hepatoma cells. Chromatin of both hepatomas contains antigens which are not detected in liver chromatin. Hepatoma 27 contains also antigens detected in this tumour only. At least some antigens of tumour cells are not found in regenerating liver and in liver cells of newborn rats. Antigenic properties of liver cells chromatin in old (30 months) rats approach to those of hepatoma cells chromatin.