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Thu 9/19/2019 11:00AM - 12:00PM
EOH Journal Club
Particle Depletion Does Not Remediate Acute Effects of Traffic-related Air Pollution and Allergen EOH Journal Club
Particle Depletion Does Not Remediate Acute Effects of Traffic-related Air Pollution and Allergen
Thu 9/19/2019 11:00AM - 12:00PM
4140 Public Health, Young Seminar Room

Presenter: Brandy Hill

Paper: Particle Depletion Does Not Remediate Acute Effects of Traffic-related Air Pollution and Allergen. A Randomized, Double-Blind Crossover Study

Authors: Denise J. Wooding, Min Hyung Ryu, Anke Huls, Andrew D. Lee, David T. S. Lin, Christopher F. Rider, Agnes C. Y. Yuen, and Chris Carlsten

Abstract:
Rationale: Diesel exhaust (DE), an established model of trafficrelated
air pollution, contributes significantly to the global burden of
asthma and may augment the effects of allergen inhalation. Newer
diesel particulate-filtering technologies may increaseNO2 emissions,
raising questions regarding their effectiveness in reducing harm from
associated engine output.

Objectives: To assess the effects of DE and allergen coexposure on
lung function, airway responsiveness, and circulating leukocytes, and
determine whether DE particle depletion remediates these effects.

Methods: In this randomized, double-blind crossover study, 14
allergen-sensitized participants (9 with airway hyperresponsiveness)
underwent inhaled allergen challenge after 2-hour exposures to DE,
particle-depleted DE (PDDE), or filtered air. The control condition
was inhaled saline after filtered air. Blood sampling and spirometry
were performed before and up to 48 hours after exposures. Airway
responsiveness was evaluated at 24 hours.

Measurements and Main Results: PDDE plus allergen
coexposure impaired lung function more than DE plus allergen,
particularly in those genetically at risk. DE plus allergen and PDDE
plus allergen each increased airway responsiveness in normally
responsive participants.DEplus allergen increased blood neutrophils
and was associated with persistent eosinophilia at 48 hours. DE and
PDDE each increased total peripheral leukocyte counts in a manner
affected by participant genotypes. Changes in peripheral leukocytes
correlated with lung function decline.

Conclusions: Coexposure to DE and allergen impaired lung
function, which was worse after particle depletion (which increased
NO2). Thus, particulates are not necessarily the sole or main
culprit responsible for all harmful effects of DE. Policies and
technologies aimed at protecting public health should be scrutinized
in that regard.
Clinical trial registered with www.clinicaltrials.gov (NCT02017431).

Keywords: diesel exhaust; asthma; filter; genetic susceptibility


4140 Public Health, Young Seminar Room

Recent Events

EOH Journal Club

EOH Journal Club Seminar - Fall 2018

Thursday 9/27 11:00AM - 12:00PM
4140 Public Health, Young Seminar Room
EOH Journal Club Seminar - Fall 2018

Date: Thursday September 27, 2018

Time: 11am - 12pm

Presenter: Pattra Chun-on

Paper: Predictors of Asthma/COPD Overlap in FDNY Firefighters With World Trade Center Dust Exposure

Authors:
Ankura Singh, MPH; Charles Liu, MD; Barbara Putman, MD; Rachel Zeig-Owens, DrPH, MPH; Charles B. Hall, PhD; Theresa Schwartz, MS; Mayris P. Webber, DrPH, MPH; Hillel W. Cohen, DrPH, MPH; Kenneth I. Berger, MD; Anna Nolan, MD; David J. Prezant, MD; and Michael D. Weiden, MD


Abstract:
BACKGROUND: Previously healthy firefighters with World Trade Center (WTC) dust exposure developed airway disease. Risk factors for irritant-associated asthma/COPD overlap are poorly defined.

METHODS: This study included 2,137 WTC-exposed firefighters who underwent a clinically indicated bronchodilator pulmonary function test (BD-PFT) between 9/11/2001 and 9/10/2017.Apost-BD FEV1 increase of>12% and 200 mL from baseline defined asthma, and a post-BD FEV1/FVC ratio < 0.7 identified COPD cases. Participants who met both criteria had asthma/COPD overlap. Eosinophil levels were measured on screening blood tests performed shortly after 9/11/2001 and prior to BD-PFT; a subgroup of participants also had serum IgE and 21 cytokines measured (n ¼215). Marginal Cox regression models formultiple events assessed the associations of eosinophil levels or serum biomarkers with subsequent diagnosis, with age, race, smoking,WTCexposure, first post-9/11 FEV1/FVC ratio, and BMI included as covariates.

RESULTS: BD-PFT diagnosed asthma/COPD overlap in 99 subjects (4.6%), isolated-asthma in 202 (9.5%), and isolated-COPD in 215 (10.1%). Eosinophil concentration $ 300 cells/mL was associated with increased risk of asthma/COPD overlap (hazard ratio [HR], 1.85; 95% CI,1.16-2.95) but not with isolated-asthma or isolated-COPD. Serum IL-4 also predicted asthma/COPD overlap (HR, 1.51 per doubling of cytokine concentration; 95% CI, 1.17-1.95). Greater IL-21 concentration was associated with both isolated-asthma and isolated-COPD (HRs of 1.73 [95% CI, 1.27-2.35] and 2.06 [95% CI, 1.31-3.23], respectively).

CONCLUSIONS: In WTC-exposed firefighters, elevated blood eosinophil and IL-4 levels are associated with subsequent asthma/COPD overlap. Disease-specific T-helper cell type 2 biomarkers present years before diagnosis suggest patient-intrinsic predisposition to irritantassociated asthma/COPD overlap.

KEY WORDS: asthma; airway obstruction; biomarkers; COPD; eosinophils

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Last Updated On Friday, September 14, 2018 by Orbell, Adam W
Created On Friday, September 14, 2018

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