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Impacts of Environmental Pollutants on Innate Immunity: The Role of Group 2 Innate Lymphoid Cells.
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Everyday pollutants, like smog, cigarette smoke, and even microplastics, don't just harm your lungs directly; this review shows they can also confuse your immune system by damaging the protective lining of your airways and triggering specialized immune cells (called ILC2s) that drive allergic-type inflammation. This matters because it helps explain why pollution exposure is linked to rising rates of asthma, allergies, and other inflammatory conditions, and points scientists toward new ways to prevent or treat these pollution-related illnesses.
Environmental pollution has emerged as one of the biggest threats to health in the contemporary world. Pollutants modify immune responses and may induce immunotoxicity. In this review, we describe the impact of significant environmental pollutants on the innate immune system, including ozone (O), particulate matter (PM), diesel exhaust particles (DEPs) and cigarette smoke (CS), as well as emerging pollutants such as chemical contaminants, nanomaterials, and microplastics, with a particular focus on the regulatory mechanisms of innate lymphoid cells (ILCs). ILCs, tissue-resident lymphocytes without antigen-specific receptors, have been demonstrated to be essential regulators linking environmental detection and immunological responses. Studies indicate that environmental pollutants activate ILCs and alter the immune responses by compromising the epithelial barrier and triggering the release of alarmins, including interleukin (IL)-33, IL-25, and thymic stromal lymphopoietin (TSLP). Among ILCs, group 2 innate lymphoid cells (ILC2s) are highly sensitive to pollutant-induced epithelial signals and play a critical role in type 2 inflammation. Beyond canonical alarmin signaling, accumulating evidence indicates that environmental pollutants regulate ILC2 biology thereby contributing to immune dysregulation and inflammatory diseases. A better understanding of how environmental pollutants regulate ILC2 activation, plasticity, and functional adaptation will facilitate the development of more precise preventive and therapeutic strategies for pollution-associated diseases.
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Microplastics drives ILC2s function and fatty acid metabolism in allergic airway inflammation via PPARγ signaling
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Researchers found that microplastics exacerbate allergic airway inflammation in house dust mite-sensitized mice by promoting epithelial barrier disruption and type 2 immune activation. The study revealed that microplastics drive the function of innate lymphoid cells (ILC2s) and alter fatty acid metabolism through the PPARgamma signaling pathway, providing mechanistic insight into how airborne microplastics may worsen respiratory allergies.
The Impact of Microplastics on Allergy: Current Status and Future Research Directions
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This study reviews current evidence on how microplastics may influence allergic responses, noting that microplastics can compromise epithelial barriers and promote type 2 inflammation associated with allergies. The authors emphasize an urgent need for research into dose-dependent immunotoxicological mechanisms to better understand the relationship between microplastic exposure and allergy development. The study calls for evidence-based policies to reduce microplastic exposure and its potential contribution to the growing allergy burden.
Epithelial barrier dysfunction, type 2 immune response, and the development of chronic inflammatory diseases
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This review explains how everyday substances including microplastics, air pollutants, food additives, and household chemicals damage the protective lining of our body's surfaces (epithelial barriers). Even trace amounts of these substances can cause the barriers to become leaky, allowing bacteria and allergens to trigger chronic inflammation. The research suggests that microplastic exposure, alongside other modern pollutants, may be contributing to the rise in chronic inflammatory diseases over the past several decades.
Airway exposure to microplastics: Potential mechanisms from epithelial barrier damage to the development of allergic rhinitis
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This review summarized the mechanisms by which airborne microplastic exposure triggers allergic rhinitis, identifying pathways including physical and chemical disruption of the airway epithelial barrier, oxidative stress from adsorbed pollutants, and induction of Th2 immune responses and IgE class-switching. The findings support airborne MPs as a novel trigger for upper respiratory allergic disease.
Inhaled Microplastics as Emerging Respiratory Toxicants: From Cellular Mechanisms to Global Health Policy
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This review pulls together a decade of research on tiny plastic particles floating in the air we breathe, finding that once inhaled, they can trigger inflammation, cell damage, and immune disruption deep in the lungs, effects linked to conditions like asthma, COPD, and even lung cancer. The risk may be even greater since these particles often carry other harmful substances like heavy metals along for the ride. That said, scientists still lack standardized ways to measure this exposure, so more consistent research is needed before we fully understand how worried we should be, but it's a good reason to pay attention to air quality and plastic pollution in daily life.
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