Abstract
The processes of hepatocyte multinucleation were studied in rats exposed to N-nitrosodimethylamine (NDMA). Using the immunohistochemical reaction to γ-tubulin, it was established that the number of cells containing three or more centrosomes increased 48 h after the NDMA injection. The formation of additional centrosomes in hepatocytes was shown to be based on the oxidative stress induced by NDMA metabolism with the participation of the cytochrome P450 superfamily. The administration of NDMA led to a sharp increase in the cytochrome P450 content in liver, especially 24 and 48 h (3.3 and 2.8 times, respectively) after the NDMA injection. The immunohistochemical reaction for cytochrome P4502E1 revealed an intensive staining of the cytoplasm of centrilobular hepatocytes 24 and 48 h after the NDMA action. In the same time period, a 1.1-2.0-fold increase occurs in the concentration of malonic dialdehyde (MDA) (a derivative of lipid peroxidation) and a 1.1-1.3-fold decrease in catalase activity (an enzyme of the cell antioxidative system). At a later time (72–120 h) after the NDMA action, the number of cells with three or more centrosomes, the intensity of cell cytoplasmic staining for cytochrome P450 2E1, and the concentrations of P450 and MDA in the liver decreased, whereas catalase activity increased. After 48 h of NDMA treatment, the incorporation of binuclear hepatocytes with various 3H-thymidines into nuclei occured, which indicates asynchronous DNA synthesis. The immunohistochemical reaction for pKi-67, nuclear protein that is a marker of cell proliferation, has established that the asynchronicity of nuclear proliferative activity in binuclear cells is not only characteristic of the S phase, but also of other cell cycle phases, including G1, G2, and M. Thus, the main mechanisms of hepatocyte multinucleation under the influence of NDMA are as follows: (1) increased hyperamplification of centrosomes as a consequence of oxidative stress and (2) asynchronous DNA synthesis in nuclei of binuclear hepatocytes with subsequent asynchronous acytokinetic mitosis.
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Abbreviations
- MDA:
-
malonic dialdehyde
- LPO:
-
lipid peroxidation
- NDMA:
-
N-nitrosodimethylamine
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Original Russian Text © T.M. Shalakhmetova, B.A. Umbayev, S.Zh. Kolumbayeva, B.N. Kudryavtsev, 2009, published in Tsitologiya, Vol. 51, No. 1, 2009, pp. 32–40.
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Shalakhmetova, T.M., Umbayev, B.A., Kolumbayeva, S.Z. et al. About mechanisms of formation of multinuclear hepatocytes during toxic action of N-nitrosodimethylamine on rats. Cell Tiss. Biol. 3, 61–70 (2009). https://doi.org/10.1134/S1990519X0901009X
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DOI: https://doi.org/10.1134/S1990519X0901009X