The purpose of our study is to evaluate the protective effect of diphenyl dimethyl bicarboxylate (DDB) in combination with some antioxidants, namely vitamin C (V.C), vitamin E (V.E), and selenium (Se), in liver damage induced by carbon tetrachloride (0.2 ml/kg body weight). This was done by monitoring the liver total and fractional lactate dehydrogenase (LDH) activities. The results revealed a significant increase in the activity of liver total LDH activity in CCl4 - intoxicated rats with a significant increase in both LDH3 and 4 and a significant decrease in LDH5. LDH2 disappeared after CCl4 treatment and neither DDB nor its combinations could restore this permanent change. DDB alone significantly decreased the CCl4-raised total LDH and LDH4, but still far from the control and failed to correct LDH3 and 5 variations. A combination of DDB and V.C, V.E and Se showed the best corrective potential in both total LDH and LDH3 activities, without correcting the increased LDH4, nor the decreased LDH5 isoenzyme. Although this combination was previously reported to correct liver function disturbances, it seems that CCl4 and consequently hepatitis C may induce some irreversible, non-curable changes by DDB or even by additional antioxidants. Its clinical usefulness seems to be through different metabolic pathways, not including correction of LDH disturbances, which necessitates additional investigation for other adjunct medicines for treating liver fibrosis in clinical practice.
LDH isoenzymes; liver fibrosis; DDB; CCI4; rats
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