[Effect of melatonin on mitosis of the mouse ascites hepatoma Gelstein 22A].

The action of melatonin on mitosis of the mouse ascites Gelstein 22A hepatoma has been studied in C3HA male mice with 7-day ascites. The cells of ascites hepatoma have shown the metaphase block after intraperitoneal injection of melatonin. It was found that 3 hours after administration melationin at a concentration of 200 and 100 micrograms per 1 g body weight induces an increase in the mitotic index and accumulation of mitoses at the stage of metaphase.