Effects of Airborne Particulate Matter in Biomass Treatment Plants on the Expression of DNA Repair and IL-8 Genes
2025
Noemi Zanchi | Elena Franchitti | Deborah Traversi
Biogas plants for sewage and organic waste treatment are rapidly expanding. While these facilities provide valuable benefits, such as renewable energy production and the promotion of circular economy practices, they also emit airborne particles of biological origin, which may pose potential health risks. This study aims to evaluate, by in vitro assay, the cytotoxic and genotoxic potential of PM<sub>10</sub> sub-fractions (0.49–10 µm and <0.49 µm) generated in eight different plants, also assessing the endotoxin component using the Limulus Amebocyte Lysate (LAL) assay. Human embryonic lung fibroblasts (HELF) were exposed to organic extracts of particulate matter (PM). Cytotoxic effects (XTT assay) were analyzed, along with the modulation of gene expression involved in DNA repair (ERCC1, XRCC1, XPA, and XPF) and IL-8 production as a marker of inflammatory response. PM<sub>10</sub> and endotoxin concentrations varied significantly among the plants (ANOVA, <i>p</i> < 0.01), with PM<sub>10</sub> levels ranging from 14 to 18,000 µg/m<sup>3</sup> and endotoxin content from 1 to 138 EU/m<sup>3</sup>. Exposure significantly increased ERCC1 and IL-8 expression by 25% and 53%, respectively (paired <i>t</i>-test, <i>p</i> < 0.01). IL-8 expression correlated with endotoxin exposure (Spearman’s rho = 0.35; <i>p</i> < 0.01). A deeper understanding of the biological component of airborne PM<sub>10</sub> can enhance risk assessments for occupational and nearby resident communities’ safety.
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