Abstract
Induction of nuclear factor kappa B (NF-κB)-mediated gene expression has been implicated in the pathogenesis of alcoholic liver disease through enhanced production of reactive oxygen species and pro-inflammatory mediators. The present study was carried out to investigate the role of catechin as a chain breaking inhibitor against experimental alcoholic liver injury. Rats were administered 35% v/v ethanol orally at a dose of 10 g/Kg/day for two weeks, followed by 14 g/Kg/day for 10 weeks. Catechin (50 mg/Kg) was co-supplemented after 4 weeks of alcohol treatment till the end of the dosing period. Following chronic alcohol exposure, rats developed endotoxemia and severe pathological changes in the liver such as pronounced fatty change, vacuolar degeneration and inflammation. These changes were accompanied by activation of NF-κB and induction of inflammatory and cytotoxic mediators leading to increased level of tumor necrosis factor-alpha, enhanced formation of malondialdehyde in the liver followed by drastic alterations in the hepatic antioxidant defense systems. Additionally, nitrite levels and lactate dehydrogenase activities were also significantly elevated on chronic alcohol consumption. Alcohol exposure also increased the number of micronucleated cells indicating that alcohol abuse may again be associated with the nuclear changes. Supplementation with catechin ameliorated the alcohol-induced liver injury by downregulating the endotoxin-mediated activation of initial signalling molecule NF-κB and further going downstream the signalling cascade including tumor necrosis factor-alpha, nitric oxide and reactive oxygen species and by enhancing the antioxidant profile. These observations correlated well with the histological findings. Moreover, a remarkable decrease in the percentage of micronucleated cells was observed with catechin supplementation indicating an apparent protection against alcohol-induced toxicity. These findings suggest that catechin may alleviate experimental alcoholic liver disease by suppressing induction of NF-κB, a key component of signalling pathway, thus forming a pharmacological basis for designing novel therapeutic agents against alcohol induced endotoxin-mediated liver injury.
Highlights
Alcohol abuse remains a global social evil associated with a large number of clinical problems such as alcoholic liver disease (ALD) [1,2,3]
Blood Alcohol Levels In each of the groups studied, the rats increased their weight at a constant rate; there was no difference in weight gain among the groups
The development of effective therapy to prevent or treat ALD will depend on elucidating the suppression/blockage of any of the steps culminating into liver injury
Summary
Alcohol abuse remains a global social evil associated with a large number of clinical problems such as alcoholic liver disease (ALD) [1,2,3]. Regular consumption of alcohol can cause various hepatic abnormalities ranging from steatohepatitis to cirrhosis and hepatocellular carcinoma [4,5]. Since no therapy except orthotopic liver transplantation for end stage liver disease is available, abstinence from chronic consumption of alcohol is the only way to avoid this dreadful pathology [2,3,5]. The endotoxin, released induces a signalling cascade leading to the activation of transcription factor NF-kB. NF-kB gets translocated to the nucleus and causes rapid gene induction resulting in the expression of inflammatory mediators, including cytokines
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