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Inhalation toxicity of nanoplastics: mechanistic insights from biophysical barrier disruption to chronic lung diseases
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Tiny plastic particles in the air we breathe may be able to reach deep into our lungs, where scientists think they can damage cells' energy centers, trigger inflammation, and potentially contribute to problems like asthma flare-ups and lung scarring over time. This review pulls together existing research to map out how this damage might unfold step-by-step, though it's based on lab studies rather than proof of harm in real-world human exposure. The big takeaway: as plastic pollution keeps growing, understanding how these invisible particles affect our lungs is an important and still-developing area of health science.
Airborne nanoplastics (NPs) are increasingly recognized as an emerging respiratory health concern because their small size enables deposition in the distal lung, where they can interact directly with the alveolar microenvironment. However, the sequence of mechanisms linking their initial physicochemical interactions to chronic pulmonary outcomes remains insufficiently defined. This review integrates recent evidence to propose a mechanistic framework connecting early biophysical barrier disruption with intracellular stress signaling and progressive lung pathology. We discuss how inhaled NPs may destabilize lung surfactant (LS) structure and function and acquire biological coronas that modify their cellular interactions and uptake. We then examine how lysosomal dysfunction, impaired mitophagy, and mitochondrial damage amplify oxidative stress and promote the release of mitochondrial danger signals, leading to activation of cGAS-STING and the NLRP3 inflammasome. These events contribute to sterile inflammation, pyroptotic signaling, ferroptotic cell death, and profibrotic remodeling. Particular attention is given to epithelial injury, fibroblast metabolic reprogramming, and immune dysregulation as key processes that may underlie asthma exacerbation and pulmonary fibrosis. Finally, we highlight current knowledge gaps, including the limited relevance of short-term high-dose models to chronic low-dose inhalation scenarios, and discuss priorities for future research, biomarker development, and mechanism-based intervention strategies.
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Pathophysiological effects of inhaled airborne microplastics on the respiratory epithelial barrier: A review
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Tiny plastic particles floating in the air we breathe may be doing more damage to our lungs than we realized. This review of existing research found that when these microplastics land in our airways, they can trigger cell stress, inflammation, and damage to the protective lining of our lungs—potentially making respiratory problems worse over time. While scientists still need more long-term studies to fully understand the risks, this research is an early warning sign that the plastic pollution in our air isn't just an environmental issue—it could be a health issue too.
Recent advances on transport and transformation mechanism of nanoplastics in lung cells
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This review examines how nanoplastics, the smallest fragments of plastic pollution, travel through and affect lung cells after being inhaled. Researchers summarized evidence that these particles can cross cell membranes, trigger inflammation, and undergo chemical changes inside respiratory tissue. The findings underscore that airborne nanoplastics represent a potential threat to human respiratory health that warrants further investigation.
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.
Atmospheric microplastic and nanoplastic: The toxicological paradigm on the cellular system
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This review examines how airborne microplastics and nanoplastics affect human cells after being inhaled into the lungs. Because these particles are tiny and lightweight, they can penetrate deep into lung tissue and potentially enter the bloodstream. Studies on human cell lines show that inhaled plastic particles can cause inflammation, oxidative stress, and DNA damage, raising concerns about long-term respiratory and systemic health effects.
Polystyrene nanoplastics impair epithelial barrier establishment and modulate extracellular vesicle release in human bronchial cells cultured at the air-liquid interface
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Scientists exposed lab-grown human airway cells to tiny nanoplastic particles (like those found in breathing air polluted with plastic waste) and found the particles weakened the protective barrier these cells normally form, while also triggering inflammation-related signals. This suggests nanoplastics could make airways more vulnerable, especially in people whose lung lining is already damaged or still developing—though this was shown in a lab model, not in humans breathing polluted air, so more research is needed to confirm real-world impact.
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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.