Exposure to vehicle emissions results in altered blood brain barrier permeability and expression of matrix metalloproteinases and tight junction proteins in mice.

Abstract:

BACKGROUND:Traffic-generated air pollution-exposure is associated with adverse effects in the central nervous system (CNS) in both human exposures and animal models, including neuroinflammation and neurodegeneration. While alterations in the blood brain barrier (BBB) have been implicated as a potential mechanism of air pollution-induced CNS pathologies, pathways involved have not been elucidated. OBJECTIVES:To determine whether inhalation exposure to mixed vehicle exhaust (MVE) mediates alterations in BBB permeability, activation of matrix metalloproteinases (MMP) -2 and -9, and altered tight junction (TJ) protein expression. METHODS:Apolipoprotein (Apo) E(-/-) and C57Bl6 mice were exposed to either MVE (100 μg/m(3) PM) or filtered air (FA) for 6 hr/day for 30 days and resulting BBB permeability, expression of ROS, TJ proteins, markers of neuroinflammation, and MMP activity were assessed. Serum from study mice was applied to an in vitro BBB co-culture model and resulting alterations in transport and permeability were quantified. RESULTS:MVE-exposed Apo E(-/-) mice showed increased BBB permeability, elevated ROS and increased MMP-2 and -9 activity, compared to FA controls. Additionally, cerebral vessels from MVE-exposed mice expressed decreased levels of TJ proteins, occludin and claudin-5, and increased levels of inducible nitric oxide synthase (iNOS) and interleukin (IL)-1β in the parenchyma. Serum from MVE-exposed animals also resulted in increased in vitro BBB permeability and altered P-glycoprotein transport activity. CONCLUSIONS:These data indicate that inhalation exposure to traffic-generated air pollutants promotes increased MMP activity and degradation of TJ proteins in the cerebral vasculature, resulting in altered BBB permeability and expression of neuroinflammatory markers.

journal_name

Part Fibre Toxicol

authors

Oppenheim HA,Lucero J,Guyot AC,Herbert LM,McDonald JD,Mabondzo A,Lund AK

doi

10.1186/1743-8977-10-62

subject

Has Abstract

pub_date

2013-12-17 00:00:00

pages

62

issn

1743-8977

pii

1743-8977-10-62

journal_volume

10

pub_type

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