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The review article “Airborne particulates and brain health: The role of PM_2.5 in blood–brain-barrier dysfunction” published in the Journal of Cerebral Blood Flow & Metabolism provides an overview of current findings on the influence of fine dust on the integrity of the blood-brain barrier (BBB). The focus here is on cell-specific reactions that contributes neurovascular dysfunction.

Air pollution is the greatest environmental health risk to humans worldwide. It can harm almost all human organs and lead to serious health problems. Air pollution is associated with an increased risk of cardiovascular disease, for example.

Ambient particulate matter, especially fine dust and ultrafine dust, is also a significant risk factor for the pathogenesis of neurological diseases. The neurotoxic effect results from structural and functional damage to the blood-brain barrier (BBB) and the neurovascular unit.

The BBB is a semi-permeable diffusion barrier between the bloodstream and brain tissue that selectively regulates the entry of substances into the central nervous system. It is therefore an important protective barrier that prevents potentially harmful substances from entering the brain. Structurally, the BHS is a complex system of different cell types, including microvascular endothelial cells, pericytes and astrocytes.

Damage caused by exposure to fine dust occurs either through systemic inflammation or through the direct translocation of particles into the central nervous system. At the cellular level, this is followed by endothelial dysfunction induced by oxidative stress and the activation of pro-inflammatory signalling cascades. This results in an increase in the permeability of the barrier, enabling the infiltration of immune cells and the release of neurotoxic mediators. This leads to disruption of neurovascular coupling, which can further exacerbate neuronal damage.

In conclusion, the link between exposure to particulate matter and neurodegenerative diseases is evident. Despite this finding, there are still gaps in our knowledge regarding the spatial-temporal dynamics of the damage and the synergistic effects with pre-existing vascular conditions such as diabetes mellitus and hypertension. Reducing the environmental burden of neurological disease requires a dual strategy of preventive measures for air pollution control and pharmacological and nutritional interventions to protect the integrity of the BBB.

The review article can be found at this link:

Airborne particulates and brain health: The role of PM?.? in blood–brain-barrier dysfunction