Status of inflammatory biomarkers in the population that survived the Bhopal gas tragedy: a study after two decades

Bhopal gas tragedy is considered as one of the world's worst industrial disaster. Approximately, 3,000-6,000 people died and 200,000 injured due to the leak of 40 tons of methyl isocyanate (MIC) gas from a pesticide plant. We aimed to decipher any persistent and subtle immunotoxic effects of MIC in the survivors of the tragedy. The study was divided into 3 groups i.e. group I (n=40); Age and gender matched non-exposed healthy controls recruited from places within the geographical region of Bhopal but from unaffected zones, group II (n=40); Age and gender matched non-exposed healthy controls recruited from places well outside geographical region of Bhopal and group III (n=40); Age and gender matched MIC exposed subjects from affected zones inside geographical region of Bhopal and the status of inflammatory biomarkers (IL-8, IL-1beta, IL-6, TNF, IL-10, IL-12p70 cytokines and C-reactive protein) were analysed. The results displayed a significant increase in the levels of all circulating inflammatory biomarkers in the MIC exposed group in comparison to non-exposed cohorts. A toxin induced genetic and/or epigenetic alteration seems to be the likely underlying cause. However, further studies are essential for both mechanistic understanding and clinical implications of these patterns.