Abstract
Donryu male albino rats were fed a diet containing 0.064% 3′-methyl-4-dimethylaminoazobenzene (MDAB) for 21 weeks. During the ensuing rat liver carcinogenesis, changes in the concentrations of methylglyoxal,d-lactate and glutathione as well as activities of glyoxalase I and II in liver and plasma were examined. After the start of the diet, hepatic contents of methylglyoxal andd-lactate increased to about 7 and 3 times that of the control, respectively. However, after 21 weeks thed-lactate content decreased from the elevated level, but remained at a higher level of 1.4 times the control. The hepatic glyoxalase I activity increased 1.2 to 1.7 times over the control during carcinogenesis, while glyoxalase II activity increased 160% during the precancerous state and decreased to 55% of control at 21 weeks. The hepatic level of reduced glutathione (GSH) increased and peaked after 4 weeks of the MDAB diet and decreased thereafter to 57% of the control level after 21 weeks. Both pyruvate andl-lactate levels increased in the liver and plasma of MDAB-fed rats when rats had obvious symptoms of hepatoma.
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Kawase, M., Tada, M., Akagi, S. et al. Changes in concentrations of methylglyoxal,d-lactate and glyoxalase activities in liver and plasma of rats fed a 3′-methyl-4-dimethylaminoazobenzene-rich diet. Res. Exp. Med. 196, 251–259 (1996). https://doi.org/10.1007/BF02576849
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DOI: https://doi.org/10.1007/BF02576849