Question

Discuss the mechanism of hepatotoxicity caused by the following toxicants:

(i) Carbon tetrachloride (ii) Paracetamol

18 Dec 2025
Answer :
Word Count : 436
Carbon tetrachloride (CCl₄) is a classic hepatotoxicant whose toxicity is primarily mediated through its metabolism in the liver. Upon entering hepatocytes, CCl₄ undergoes bioactivation by the cytochrome P450 enzyme system, particularly CYP2E1, to form the highly reactive trichloromethyl free radical (CCl₃•). This radical can react with cellular macromolecules including lipids, proteins, and nucleic acids, initiating lipid peroxidation of the endoplasmic reticulum and other membranous structures. Lipid peroxidation disrupts membrane integrity, leading to increased permeability, leakage of cellular enzymes such as alanine aminotransferase (ALT) and aspartate aminotransferase (AST), and eventual hepatocyte necrosis. The trichloromethyl radical can further react with oxygen to form the trichloromethyl peroxy radical (CCl₃OO•), which exacerbates oxidative stress and perpetuates damage to mitochondrial membranes, impairing ATP synthesis. CCl₄-induced hepatotoxicity is also characterized by centrilobular necrosis, as the highest concentration of CYP2E1 is present in the central vein area of the hepatic lobule. Additionally, inflammatory responses triggered by Kupffer cells amplify liver injury by releasing cytokines
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