Abstract

The liver is the primary site for xenobiotic metabolism and detoxification, rendering it particularly vulnerable to 
injury from drugs, environmental toxicants, dietary chemicals, and industrial pollutants. Hepatotoxicity triggers 
complex interactions between metabolic pathways and immune signaling networks, leading to immune 
dysregulation that can progress from acute hepatic injury to chronic inflammation and long-term liver diseases. 
Recent evidence shows that metabolic activation of xenobiotics generates reactive metabolites, oxidative stress, 
mitochondrial dysfunction, and endoplasmic reticulum stress, all of which initiate inflammatory responses mediated 
by Kupffer cells, hepatocytes, dendritic cells, and infiltrating immune cells. These events involve pattern recognition 
receptors, inflammasome activation, cytokine secretion, and modulation of adaptive immune responses. Persistent 
dysregulation of the hepatic immune environment drives fibrosis, steatohepatitis, metabolic derangements, and 
hepatocarcinogenesis. This review examines emerging mechanisms linking xenobiotic metabolism to immune 
activation, with emphasis on redox signaling, damage-associated molecular patterns, dysregulated cytokine 
networks, microbiome-derived metabolites, and genetic susceptibility factors. Understanding these interconnected 
pathways is essential for the development of targeted therapies, predictive biomarkers, and strategies for mitigating 
xenobiotic-induced chronic liver disease.