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The epithelial barrier under siege: Comparative mechanisms and synergistic immunotoxicity of particulate matter and micro- and nanoplastics (MNPs)
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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.
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Climate change and the epithelial barrier theory in allergic diseases: A One Health approach to a green environment
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This review links climate change and increased environmental pollution to the weakening of epithelial barriers in the skin, gut, and lungs, contributing to the rise of allergic diseases worldwide. The paper specifically identifies microplastics alongside other pollutants as agents that damage epithelial barriers, suggesting a mechanism by which microplastic exposure could contribute to allergies and autoimmune conditions.
Epithelial barrier hypothesis: Effect of the external exposome on the microbiome and epithelial barriers in allergic disease
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This review proposes the 'epithelial barrier hypothesis,' which suggests that modern environmental exposures, including microplastics, air pollution, and processed food additives, are damaging the protective barriers of our skin, gut, and airways. When these barriers break down, foreign substances and bacteria can enter the body and trigger allergic and inflammatory diseases, which have been increasing rapidly in recent decades. The research suggests microplastics may be one of many environmental factors driving the rise in conditions like asthma, food allergies, and eczema.
Recent advances in the epithelial barrier theory
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This review explains the "epithelial barrier theory," which links the rise in allergies, autoimmune diseases, and other chronic conditions to environmental pollutants, including micro- and nanoplastics, that damage the protective lining of our skin, lungs, and gut. These pollutants can break down the tight junctions between cells, trigger inflammation, and allow harmful substances to enter the body, potentially contributing to the increase in chronic diseases seen worldwide.
Epithelial Barrier Theory: The Role of Exposome, Microbiome, and Barrier Function in Allergic Diseases
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This review presents the epithelial barrier theory, which proposes that damage to the body's protective barriers is a key driver of allergic diseases. Researchers identified numerous environmental factors including microplastics, nanoparticles, detergents, and processed food additives that can weaken epithelial barriers in the skin, lungs, and gut. The study suggests that the rising prevalence of allergies may be linked to increasing exposure to barrier-disrupting substances in our modern environment.
Environmental factors in epithelial barrier dysfunction
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This review examines how environmental factors from the modern industrialized world -- including air pollution, detergents, nanoparticles, and microplastics -- damage the protective lining of the skin, gut, and airways. Researchers describe how these exposures degrade the proteins that hold barrier cells together, increasing permeability and triggering immune responses linked to allergies, asthma, and inflammatory conditions. The study presents an "epithelial barrier hypothesis" suggesting that widespread barrier dysfunction from environmental pollutants may be driving the rise of chronic inflammatory diseases.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.