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Persistent endothelial dysfunction in humans after diesel exhaust inhalation.

Abstract：

RATIONALE:Exposure to combustion-derived air pollution is associated with an early (1-2 h) and sustained (24 h) rise in cardiovascular morbidity and mortality. We have previously demonstrated that inhalation of diesel exhaust causes an immediate (within 2 h) impairment of vascular and endothelial function in humans. OBJECTIVES:To investigate the vascular and systemic effects of diesel exhaust in humans 24 hours after inhalation. METHODS:Fifteen healthy men were exposed to diesel exhaust (particulate concentration, 300 microg/m(3)) or filtered air for 1 hour in a double-blind, randomized, crossover study. Twenty-four hours after exposure, bilateral forearm blood flow, and inflammatory and fibrinolytic markers were measured before and during unilateral intrabrachial bradykinin (100-1,000 pmol/min), acetylcholine (5-20 microg/min), sodium nitroprusside (2-8 microg/min), and verapamil (10-100 microg/min) infusions. MEASUREMENTS AND MAIN RESULTS:Resting forearm blood flow, blood pressure, and basal fibrinolytic markers were similar 24 hours after either exposure. Diesel exhaust increased plasma cytokine concentrations (tumor necrosis factor-alpha and interleukin-6, p < 0.05 for both) but appeared to reduce acetylcholine (p = 0.01), and bradykinin (p = 0.08) induced forearm vasodilatation. In contrast, there were no differences in either endothelium-independent (sodium nitroprusside and verapamil) vasodilatation or bradykinin-induced acute plasma tissue plasminogen activator release. CONCLUSIONS:Twenty-four hours after diesel exposure, there is a selective and persistent impairment of endothelium-dependent vasodilatation that occurs in the presence of mild systemic inflammation. These findings suggest that combustion-derived air pollution may have important systemic and adverse vascular effects for at least 24 hours after exposure.

journal_name

Am J Respir Crit Care Med

journal_title

American journal of respiratory and critical care medicine

authors

Törnqvist H,Mills NL,Gonzalez M,Miller MR,Robinson SD,Megson IL,Macnee W,Donaldson K,Söderberg S,Newby DE,Sandström T,Blomberg A

doi

10.1164/rccm.200606-872OC

subject

Has Abstract

pub_date

2007-08-15 00:00:00

pages

395-400

issue

4

eissn

1073-449X

issn

1535-4970

pii

200606-872OC

journal_volume

176

pub_type

杂志文章,随机对照试验

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