Rapid effects of diesel exhaust particulate extracts on intracellular signaling in human endothelial cells.

Abstract:

:Inhalation of ultrafine particulate matter (PM) in air pollution increases cardiovascular mortality by passing into systemic circulation and possibly affecting endothelial cell (EC) function. This study identified the chemical constituents, including polycyclic aromatic hydrocarbons (PAHs), in diesel exhaust particulate extracts (DEPEs) prepared from a truck run at different speeds and engine loads. The short-term effects of DEPEs alone or in combination with estradiol (E(2)) on MAPK (ERK1/2), AKT, and eNOS activation and nitric oxide (NO) production in human umbilical vein EC (HUVEC) were evaluated. Notably, DEPE from a truck run under increasing loads (L) stimulated phosphorylation of MAPK, AKT, and eNOS whereas DEPE from the truck run at increasing speeds (S) did not affect MAPK alone, but inhibited E(2)-induced MAPK and eNOS phosphorylation. Higher PAH concentrations in the DEPE L versus DEPE S samples correlate with the observed differences in cellular activities. Like E(2), DEPEs rapidly increased NO with the DEPE L sample acting additively with E(2) and then inhibiting E(2)-induced NO with longer treatment time. Like E(2), DEPEs increased trans-endothelial electrical resistance (TEER) across a monolayer of HUVEC. These data are the first characterization of rapid effects of DEPE in human EC and may indicate mechanisms for diesel exhaust in vascular function.

journal_name

Toxicol Lett

journal_title

Toxicology letters

authors

Sumanasekera WK,Ivanova MM,Johnston BJ,Dougherty SM,Sumanasekera GU,Myers SR,Ali Y,Kizu R,Klinge CM

doi

10.1016/j.toxlet.2007.08.014

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

61-73

issue

1-3

eissn

0378-4274

issn

1879-3169

pii

S0378-4274(07)00922-8

journal_volume

174

pub_type

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