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Do nanoplastics reshape microglial support of neuronal resilience? A study of microglial bioenergetics and microglia-neuron communication in vitro.
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Lab-grown brain support cells (microglia) and neurons were exposed to plastic nanoparticles. Low to medium amounts boosted the cells' energy levels and support signals to neurons, while high amounts reduced energy levels and weakened communication between the two cell types.
Nanoplastics (NPs) are emerging environmental contaminants able to cross biological barriers, disrupt cellular and organelle homeostasis, and alter the brain microenvironment. This study investigated whether NPs affect microglia-neuron communication, a key mechanism underlying neuronal resilience, via the nuclear factor erythroid 2-like 2 (NFE2L2) pathway. Using an in vitro model, we evaluated the effects of polystyrene nanoplastics on microglial metabolic fitness and microglia-mediated neuronal stress responses. Increasing NP concentrations induced a dose-dependent biphasic effect. Low- to intermediate-concentration treatments increased intracellular adenosine triphosphate (ATP) levels in microglia and enhanced microglia-mediated activation of neuronal NFE2L2. In contrast, high NP concentrations impaired microglial metabolism, reduced ATP availability, and decreased microglial-neuronal communication. These findings indicate that NPs alter microglial energetic status and modulate neuroprotective signaling, potentially contributing to impaired neuron-microglia interactions and increased susceptibility to neurotoxicity.
More Papers Like This
Do nanoplastics reshape microglial support of neuronal resilience? A study of microglial bioenergetics and microglia–neuron communication in vitro
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Scientists exposed brain cells in a lab dish to tiny plastic particles (nanoplastics) to see how they affect microglia—immune cells that support and protect neurons. They found that low amounts of plastic actually boosted microglia's energy levels and their ability to help neurons handle stress, but high amounts overwhelmed the cells' energy production and weakened this protective support. This suggests that as nanoplastic exposure builds up, it could make brain cells more vulnerable to damage—though this was shown in cells in a dish, not in living animals or people, so more research is needed to know what this means for human brain health.
Exposure to microplastics/ nanoplastics induces responses of microglia and astrocytes: roles of oxidative stress and autophagy
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This study examined how microplastic and nanoplastic exposure affects glial cells in the central nervous system, specifically investigating responses of microglia and astrocytes, which are the brain's primary immune and support cells. Results showed that micro- and nanoplastic exposure triggered inflammatory-type responses in these cells, raising concern for neurological effects.
Exposure to microplastics/ nanoplastics induces responses of microglia and astrocytes: roles of oxidative stress and autophagy
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This study investigated how microplastic and nanoplastic exposure affects glial cells including microglia and astrocytes in the central nervous system, which are essential for neurological immune defense and homeostasis. Exposure triggered reactive responses in both cell types, raising concern that plastic particle accumulation in the brain could contribute to neuroinflammation.
Our plastic world – what does it mean for our health?
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A brief overview of the NanoGlia ERC research project describes ongoing investigations into how nanoplastic particles activate brain immune cells (microglia), potentially triggering neurodevelopmental and neurodegenerative disorders. This research addresses a critical gap: whether the nanoplastics now found in human brain tissue are causally linked to neurological disease.
Adverse interactions of plastic nanoparticles with cultured primary microglial cells.
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Tiny plastic particles from broken-down polystyrene (a common plastic) can get absorbed into brain immune cells called microglia, causing stress damage and triggering inflammation, according to lab tests on these cells. This matters because microglia act as the brain's cleanup crew and first line of defense, so if microplastics cause them to malfunction, it could contribute to brain inflammation linked to neurological problems—though this study was done in isolated cells, not in living people, so more research is needed to know exactly what this means for human brain health.
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