Ignite Creation Date:
2025-12-25 @ 3:19 AM
Ignite Modification Date:
2025-12-26 @ 1:57 AM
Study NCT ID:
NCT00434005
Status:
COMPLETED
Last Update Posted:
2013-01-16
First Post:
2006-08-25
Is NOT Gene Therapy:
False
Has Adverse Events:
False
Brief Title:
Effect of Diesel Exhaust Particulate Exposures on Endothelial Function in Humans
Sponsor:
Organization:
Raw JSON
{'hasResults': False, 'derivedSection': {'miscInfoModule': {'versionHolder': '2025-12-24'}, 'interventionBrowseModule': {'meshes': [{'id': 'D000111', 'term': 'Acetylcysteine'}], 'ancestors': [{'id': 'D003545', 'term': 'Cysteine'}, {'id': 'D000603', 'term': 'Amino Acids, Sulfur'}, {'id': 'D013457', 'term': 'Sulfur Compounds'}, {'id': 'D009930', 'term': 'Organic Chemicals'}, {'id': 'D000596', 'term': 'Amino Acids'}, {'id': 'D000602', 'term': 'Amino Acids, Peptides, and Proteins'}]}}, 'protocolSection': {'designModule': {'phases': ['NA'], 'studyType': 'INTERVENTIONAL', 'designInfo': {'allocation': 'RANDOMIZED', 'maskingInfo': {'masking': 'QUADRUPLE', 'whoMasked': ['PARTICIPANT', 'CARE_PROVIDER', 'INVESTIGATOR', 'OUTCOMES_ASSESSOR']}, 'primaryPurpose': 'PREVENTION', 'interventionModel': 'CROSSOVER'}, 'enrollmentInfo': {'type': 'ACTUAL', 'count': 24}}, 'statusModule': {'overallStatus': 'COMPLETED', 'startDateStruct': {'date': '2008-07'}, 'expandedAccessInfo': {'hasExpandedAccess': False}, 'statusVerifiedDate': '2013-01', 'completionDateStruct': {'date': '2010-08', 'type': 'ACTUAL'}, 'lastUpdateSubmitDate': '2013-01-14', 'studyFirstSubmitDate': '2006-08-25', 'studyFirstSubmitQcDate': '2007-02-09', 'lastUpdatePostDateStruct': {'date': '2013-01-16', 'type': 'ESTIMATED'}, 'studyFirstPostDateStruct': {'date': '2007-02-12', 'type': 'ESTIMATED'}, 'primaryCompletionDateStruct': {'date': '2010-08', 'type': 'ACTUAL'}}, 'outcomesModule': {'primaryOutcomes': [{'measure': 'Brachial artery caliber', 'timeFrame': 'Pre-exposure, immediate post-exposure'}], 'secondaryOutcomes': [{'measure': 'Brachial Artery Flow-Mediated Dilation', 'timeFrame': 'Post-Exposure'}, {'measure': 'Plasma Endothelin-1', 'timeFrame': 'Post-exposure (adjusted for pre-exposure level)'}, {'measure': 'Serum IL-6', 'timeFrame': 'Post-exposure (adjusted for pre-exposure level)'}]}, 'oversightModule': {'oversightHasDmc': False}, 'conditionsModule': {'keywords': ['Air pollution', 'diesel', 'antioxidant', 'oxidative stress', 'endothelial', 'HRV', 'BAR'], 'conditions': ['Healthy']}, 'referencesModule': {'references': [{'pmid': '22431582', 'type': 'DERIVED', 'citation': 'Cosselman KE, Krishnan RM, Oron AP, Jansen K, Peretz A, Sullivan JH, Larson TV, Kaufman JD. Blood pressure response to controlled diesel exhaust exposure in human subjects. Hypertension. 2012 May;59(5):943-8. doi: 10.1161/HYPERTENSIONAHA.111.186593. Epub 2012 Mar 19.'}], 'seeAlsoLinks': [{'url': 'http://depts.washington.edu/envhlth/nlakeexplab/index.html', 'label': 'Controlled Exposure Laboratory'}]}, 'descriptionModule': {'briefSummary': 'Objectives: This proposal addresses the overall hypothesis that ambient fine particulate matter exerts cardiovascular health effects via alteration of endothelial homeostasis, through a mechanism mediated by oxidative stress. This project will use a controlled human inhalation exposure to diesel exhaust particulate (DEP) as a model to address the following objectives: 1) Determine whether exposure to inhaled DEP is associated with endothelial dysfunction in a concentration-related manner; 2) Determine whether exposure to inhaled DEP is associated with evidence of systemic oxidative stress; and 3) Determine whether antioxidant supplementation blunts the DEP effect on endothelial function.', 'detailedDescription': "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.\n\nDiesel 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.\n\nThe objectives of this proposed research are to address the following specific hypotheses:\n\n1. 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).\n2. 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).\n3. 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."}, 'eligibilityModule': {'sex': 'ALL', 'stdAges': ['ADULT'], 'maximumAge': '49 Years', 'minimumAge': '18 Years', 'healthyVolunteers': True, 'eligibilityCriteria': 'Inclusion Criteria:\n\n* Healthy adults aged 18-49.\n\nExclusion Criteria:\n\n* 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.'}, 'identificationModule': {'nctId': 'NCT00434005', 'briefTitle': 'Effect of Diesel Exhaust Particulate Exposures on Endothelial Function in Humans', 'organization': {'class': 'OTHER', 'fullName': 'University of Washington'}, 'officialTitle': 'Effect of Diesel Exhaust Particulate Exposures on Endothelial Function in Humans - the Role of Oxidative Stress', 'orgStudyIdInfo': {'id': '22969-D'}, 'secondaryIdInfos': [{'id': 'R830954'}, {'id': 'R827355'}, {'id': 'MO1RR-00037'}, {'id': 'ES015915'}, {'id': 'ES013195'}]}, 'armsInterventionsModule': {'armGroups': [{'type': 'EXPERIMENTAL', 'label': 'Diesel Exhaust', 'interventionNames': ['Drug: N-acetylcysteine, ascorbate', 'Drug: Placebo']}, {'type': 'SHAM_COMPARATOR', 'label': 'Filtered Air', 'interventionNames': ['Drug: N-acetylcysteine, ascorbate', 'Drug: Placebo']}], 'interventions': [{'name': 'N-acetylcysteine, ascorbate', 'type': 'DRUG', 'description': 'NAC: 600mg twice daily for the day prior to exposure and 1x pre-exposure Ascorbate: 500mg twice daily for 7 days prior to exposure', 'armGroupLabels': ['Diesel Exhaust', 'Filtered Air']}, {'name': 'Placebo', 'type': 'DRUG', 'description': 'matched appearance to acetylcysteine and ascorbate intervention', 'armGroupLabels': ['Diesel Exhaust', 'Filtered Air']}]}, 'contactsLocationsModule': {'locations': [{'zip': '98105', 'city': 'Seattle', 'state': 'Washington', 'country': 'United States', 'facility': 'Northlake Laboratory', 'geoPoint': {'lat': 47.60621, 'lon': -122.33207}}], 'overallOfficials': [{'name': 'Joel D Kaufman, M.D., MPH', 'role': 'PRINCIPAL_INVESTIGATOR', 'affiliation': 'University of Washington'}]}, 'sponsorCollaboratorsModule': {'leadSponsor': {'name': 'University of Washington', 'class': 'OTHER'}, 'collaborators': [{'name': 'National Institutes of Health (NIH)', 'class': 'NIH'}], 'responsibleParty': {'type': 'PRINCIPAL_INVESTIGATOR', 'investigatorTitle': 'Professor', 'investigatorFullName': 'Joel Daniel Kaufman', 'investigatorAffiliation': 'University of Washington'}}}}