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[Microplastics and thrombo-inflammation in acute ischemic stroke : adding fuel to the fire].
Summary
Tiny plastic particles from our environment are building up in the brain and blood vessels—and this review of existing research suggests they may be fueling the inflammation and clotting that cause strokes. Scientists found these microplastics in blood clots and clogged arteries from real patients, and they appear to make blood vessels leakier, ramp up inflammation, and destabilize artery-clogging plaques. While more research is needed to confirm exactly how much risk this adds, the findings point to a real need for ways to reduce our plastic exposure and protect brain health.
The widespread use of petroleum-derived plastics has led to massive environmental exposure to micro- and nanoplastics (MNPs), generated by the degradation of plastic polymers. Ubiquitous, these contaminants enter the body mainly through the gastrointestinal tract, but also via inhalation or iatrogenic sources, reach the systemic circulation, and accumulate in the brain. Recent data show increasing cerebral concentrations of MNPs, paralleling their environmental rise, as well as their presence in human thrombi and atherosclerotic plaques. Acute ischemic stroke, a leading cause of mortality and disability worldwide, is driven by thrombo-inflammatory mechanisms involving coordinated activation of the endothelium, platelets, and leukocytes. Converging preclinical and clinical evidence suggests that MNPs amplify these processes. They promote intestinal permeability and induce systemic and local inflammation through activation of all cellular components involved in thrombo-inflammation. In addition, MNPs may contribute to the development and destabilization of atherosclerotic plaques and, indirectly, to atrial fibrillation via activation of the thrombo-inflammatory processes. Despite methodological limitations, these findings indicate that MNPs represent an emerging environmental factor that may worsen both the risk and prognosis of acute ischemic stroke. Preventive, detection, and exposure-control strategies are therefore urgently needed to address this major public health challenge.