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The epithelial barrier under siege: Comparative mechanisms and synergistic immunotoxicity of particulate matter and micro- and nanoplastics (MNPs)
Summary
This review pulls together existing research to show how air pollution and tiny plastic particles (microplastics) can each damage the protective barriers in our lungs, gut, and skin—but in different ways: pollution mainly causes chemical irritation, while plastic bits cause physical scratches and can smuggle in other harmful chemicals like a "Trojan horse." The concerning takeaway is that when you're exposed to both together, as happens in real life, the damage may compound, weakening your body's defenses and making you more prone to allergies—suggesting doctors should focus on protecting and repairing these barriers rather than just treating allergy sympt
The rapid escalation in the global prevalence of allergic diseases suggests a profound mismatch between the ancient human immune system and the rapidly evolving modern exposome. Among environmental stressors, atmospheric Particulate Matter (PM) and emerging micro- and nanoplastics (MNPs) represent ubiquitous yet distinct drivers of immune dysregulation. While numerous reviews have addressed the toxicity of these pollutants in isolation, a critical knowledge gap remains regarding their comparative effects on epithelial integrity and their combined impact in realistic exposure scenarios. This narrative review critically examines the mechanistic role of these particulates through the lens of the "Epithelial Barrier Hypothesis," positing that barrier dysfunction is the initiating event in allergic pathogenesis. We systematically delineate the mechanistic divergence between these pollutants: while PM predominantly induces oxidative stress and inflammation via specific chemical receptors such as the aryl hydrocarbon receptor (AhR), MNPs impose a unique threat characterized by physical abrasion, biopersistence, and "Trojan Horse" vector effects. Furthermore, we explore the barrier-specific susceptibility across respiratory, gastrointestinal, and cutaneous interfaces. Crucially, distinguishing this work from prior literature, we specifically address the often-overlooked synergistic toxicity within real-world co-exposure scenarios. We synthesize recent evidence demonstrating how MNP-induced physical barrier breaches significantly lower the threshold for chemical invasion and allergen sensitization. By integrating bio-material interactions and immunotoxicity, we advocate for a paradigm shift in clinical management from symptomatic control to upstream barrier repair and precise environmental intervention.