In vitro approaches to assess respiratory toxicity from volatile organic compounds: an in-depth review
Abstract
Volatile organic compounds (VOCs) are ubiquitous inhaled pollutants. This review showcases current literature utilizing in vitro models of the human respiratory system to characterize the toxicity of VOCs. To map the existing evidence base, we conducted a scoping review following systematic search and screening procedures. Comprehensive searches of MEDLINE, Embase, Web of Science, CINAHL, PubMed, and CENTRAL identified 3,052 records. After screening, 144 original studies evaluating VOC exposures in human lung epithelial models met inclusion criteria. Overall, the current literature reflects substantial heterogeneity in cell models, exposure systems, and endpoints. Among 105 unique VOCs evaluated, acrolein, formaldehyde, toluene diisocyanate, and benzene were most frequently studied. Most investigations used submerged culture systems with liquid-phase VOC application, whereas fewer employed air-liquid interface (ALI) exposures that better mimic inhalation. Cytotoxicity, oxidative stress, proinflammatory signaling, and apoptosis were the most commonly measured endpoints, with oxidative stress frequently identified as an upstream driver of inflammatory and cytotoxic responses. However, mechanistic depth varied, and studies examining metabolism, barrier function, morphology, or transcriptomic regulation were relatively uncommon. Notably, chronic or repeated exposures were rarely conducted. Overall, this review highlights the variety of VOC exposure methods and commonly assessed…
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Evidence Hub reads this as a review, done in cell cultures (in vitro), not in people. Its evidence level is 5 of 5 (Very low · case / narrative / animal / in vitro / in silico). Case reports, narrative reviews, and animal, cell or computer-model studies give the weakest evidence for human health.
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