We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Mitochondria at the crossroad: Mechanisms of nanoplastic-induced neurotoxicity and brain accumulation
Summary
This review paper pulls together existing research showing that tiny plastic particles (nanoplastics) can travel from our environment into our brains, where they damage the "power plants" inside brain cells called mitochondria, potentially triggering inflammation and cell death linked to neurological problems. While the science is still early—most studies use high, short-term doses rather than the low, ongoing exposure we'd actually experience in daily life—the findings raise real concerns about what these ubiquitous plastic particles might mean for long-term brain health.
Widespread environmental contamination with nanoplastics (NPs) poses a significant risk to human health, particularly their accumulation in the central nervous system (CNS). This review examines how NPs can breach biological barriers, including the blood-brain barrier (BBB), olfactory system, and gut-brain axis, to access the brain. After their uptake by neurons through endocytosis, NPs primarily accumulate in the mitochondria, triggering cascades of neurotoxic changes in the brain. Existing evidence shows that NP exposure impairs mitochondrial bioenergetics, causes severe oxidative damage, disrupts calcium (Ca) signaling, and impairs vital regulatory quality control processes, such as mitophagy. These effects extend throughout the cell, leading to synaptic dysfunction, altered neurotransmitter levels, chronic neuroinflammation, and the activation of various pathways associated with neuronal cell death, such as apoptosis and ferroptosis. However, despite these effects, current studies often have shortcomings, as they tend to use high acute doses instead of chronic exposures. Overall, this review identifies mitochondrial dysfunction as a critical crossroads in NP neurotoxic responses and calls for standardized and environmentally relevant experiments to assess the long-term risks of NP to the brain.