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- Essai clinique NCT00434005
Effect of Diesel Exhaust Particulate Exposures on Endothelial Function in Humans
Effect of Diesel Exhaust Particulate Exposures on Endothelial Function in Humans - the Role of Oxidative Stress
Aperçu de l'étude
Statut
Les conditions
Intervention / Traitement
Description détaillée
OBJECTIVES Evidence of the cardiovascular health effects of both acute and chronic exposure to ambient fine particulate matter (PM) has continued to accumulate in epidemiologic and experimental studies, without a demonstrated coherent pathophysiologic explanation. At the same time, the role of endothelial homeostasis in the development and triggering of cardiovascular disease has become more clear and compelling. Importantly, oxidative stress has emerged as a potential link between these two developments: Oxidative stress is known to play a role in endothelial dysfunction and is exerted by components of PM, especially of PM from combustion products. Based on this we propose an overall hypothesis: Inhalation of combustion-derived particles impact cardiovascular health by impairing endothelial function, through mechanisms mediated by increased oxidative stress.
Diesel exhaust particulate (DEP), an important contributor to ambient fine PM, has been demonstrated to exert oxidative stress in experimental systems. We propose a series of experiments to explore whether human exposure to DEP results in alteration of endothelial homeostasis and evidence of oxidative stress, and whether an antioxidant regimen can blunt the effects on endothelial function.
The objectives of this proposed research are to address the following specific hypotheses:
- Human exposure to inhaled DEP (at concentrations approximating 0, 100, 200 μg PM2.5/m3 [PM less than 2.5 microns in aerodynamic diameter]) results in concentration-related alteration of endothelial homeostasis, as reflected in ultrasonographic measurement of the brachial artery, plasma markers of endothelial homeostasis (endothelin-1, ICAM-1 [intercellular adhesion molecule-1], e-selectin, nitric oxide metabolites nitrate [NO3-] and nitrite [NO2-], IL-6, and TNF-α), and markers of thrombosis associated with endothelial activation or injury (plasminogen activator inhibitor-1 [PAI-1], Von Willebrand's factor [VWF], and D-dimer).
- Human exposure to inhaled DEP at 200 µg PM2.5/m3 results in evidence of systemic oxidative stress as assessed by markers in plasma and urine (isoprostane F-2α).
- Reduction in oxidant stress by ascorbate and N-acetylcysteine supplementation blunts the effect of inhaled DEP on endothelial function, as determined by ultrasonographic assessment of the brachial artery, plasma markers of endothelial homeostasis, or markers of thrombosis associated with endothelial activation.
Type d'étude
Inscription (Réel)
Phase
- N'est pas applicable
Contacts et emplacements
Lieux d'étude
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Washington
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Seattle, Washington, États-Unis, 98105
- Northlake Laboratory
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
La description
Inclusion Criteria:
- Healthy adults aged 18-49.
Exclusion Criteria:
- Nonsmokers, no history of hypertension, asthma, diabetes, hypercholesterolemia, or other chronic conditions requiring ongoing medical care. No recent history of antioxidant, vitamin/mineral/botanical, or fatty acid supplementation beyond a daily multi-vitamin.
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: La prévention
- Répartition: Randomisé
- Modèle interventionnel: Affectation croisée
- Masquage: Quadruple
Armes et Interventions
Groupe de participants / Bras |
Intervention / Traitement |
---|---|
Expérimental: Diesel Exhaust
|
NAC: 600mg twice daily for the day prior to exposure and 1x pre-exposure Ascorbate: 500mg twice daily for 7 days prior to exposure
matched appearance to acetylcysteine and ascorbate intervention
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Comparateur factice: Filtered Air
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NAC: 600mg twice daily for the day prior to exposure and 1x pre-exposure Ascorbate: 500mg twice daily for 7 days prior to exposure
matched appearance to acetylcysteine and ascorbate intervention
|
Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Délai |
---|---|
Brachial artery caliber
Délai: Pre-exposure, immediate post-exposure
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Pre-exposure, immediate post-exposure
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Mesures de résultats secondaires
Mesure des résultats |
Délai |
---|---|
Brachial Artery Flow-Mediated Dilation
Délai: Post-Exposure
|
Post-Exposure
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Plasma Endothelin-1
Délai: Post-exposure (adjusted for pre-exposure level)
|
Post-exposure (adjusted for pre-exposure level)
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Serum IL-6
Délai: Post-exposure (adjusted for pre-exposure level)
|
Post-exposure (adjusted for pre-exposure level)
|
Collaborateurs et enquêteurs
Parrainer
Collaborateurs
Les enquêteurs
- Chercheur principal: Joel D Kaufman, M.D., MPH, University of Washington
Publications et liens utiles
Liens utiles
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude
Achèvement primaire (Réel)
Achèvement de l'étude (Réel)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Estimation)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Estimation)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
- 22969-D
- R830954
- R827355
- MO1RR-00037
- ES015915
- ES013195
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