2023
Daily Summer Temperatures and Hospitalization for Acute Cardiovascular Events: Impact of Outdoor PM2.5 Oxidative Potential on Observed Associations Across Canada
Weichenthal S, Lavigne E, You H, Pollitt K, Shin T, Kulka R, Stieb D, Hatzopoulou M, Evans G, Burnett R. Daily Summer Temperatures and Hospitalization for Acute Cardiovascular Events: Impact of Outdoor PM2.5 Oxidative Potential on Observed Associations Across Canada. Epidemiology 2023, 34: 897-905. PMID: 37732880, DOI: 10.1097/ede.0000000000001651.Peer-Reviewed Original ResearchConceptsIschaemic heart disease eventsHeart disease eventsAcute cardiovascular eventsCardiovascular eventsDisease eventsOdds ratioPotential time-varying confoundersAcute cardiovascular effectsFine particulate air pollutionCase-crossover studyOutdoor fine particulate air pollutionHealth impactsCardiovascular health impactsParticulate air pollutionCardiovascular effectsHighest tertileTime-varying confoundersOlder subjectsHospitalizationObserved associationsOxidative stressOxidative potentialPM2.5 oxidative potentialMonthsAssociationWithin-city spatial variations in long-term average outdoor oxidant gas concentrations and cardiovascular mortality: Effect modification by oxidative potential in the Canadian Census Health and Environment Cohort
Ripley S, Gao D, Pollitt K, Lakey P, Shiraiwa M, Hatzopoulou M, Weichenthal S. Within-city spatial variations in long-term average outdoor oxidant gas concentrations and cardiovascular mortality: Effect modification by oxidative potential in the Canadian Census Health and Environment Cohort. Environmental Epidemiology 2023, 7: e257. PMID: 37545813, PMCID: PMC10403014, DOI: 10.1097/ee9.0000000000000257.Peer-Reviewed Original ResearchCanadian Census HealthCardiovascular mortalityReactive oxygen species concentrationParticulate air pollutionEnvironment CohortMeasures of PMRetrospective cohort studyFine particulate air pollutionRelevant confounding factorsProportional hazards modelOutdoor fine particulate air pollutionPopulation health impactHealth impactsCardiovascular health impactsOutdoor air pollutionCardiovascular deathCohort studyOxidant gasesEffect modificationHazards modelConfounding factorsMortalityOxidative stressHealth effectsOxidative potential
2022
Long-term Exposure to Oxidant Gases and Mortality: Effect Modification by PM2.5 Transition Metals and Oxidative Potential
Toyib O, Lavigne E, Traub A, Umbrio D, You H, Ripley S, Pollitt K, Shin T, Kulka R, Jessiman B, Tjepkema M, Martin R, Stieb DM, Hatzopoulou M, Evans G, Burnett RT, Weichenthal S. Long-term Exposure to Oxidant Gases and Mortality: Effect Modification by PM2.5 Transition Metals and Oxidative Potential. Epidemiology 2022, 33: 767-776. PMID: 36165987, PMCID: PMC9531968, DOI: 10.1097/ede.0000000000001538.Peer-Reviewed Original ResearchConceptsLong-term exposureOxidative stressFine particulate air pollutionProportional hazards modelAir pollution health effectsHealth impactsObserved health impactsParticulate air pollutionCohort studyMortality outcomesOxidant gasesEffect modificationInterquartile increaseHazards modelAdverse health impactsNonaccidental mortalityGSH levelsHealth effectsMortalityLand use regression modelsOxidative potentialMedianRegression modelsExposurePM 2.5
2021
Use of Untargeted Metabolomics to Explore the Air Pollution-Related Disease Continuum
Jin L, Godri Pollitt KJ, Liew Z, Rosen Vollmar AK, Vasiliou V, Johnson CH, Zhang Y. Use of Untargeted Metabolomics to Explore the Air Pollution-Related Disease Continuum. Current Environmental Health Reports 2021, 8: 7-22. PMID: 33420964, DOI: 10.1007/s40572-020-00298-x.Peer-Reviewed Original ResearchConceptsAir pollutant exposureAdverse health effectsSpecific adverse health effectsOxidative stressHealth effectsPerturbation of metabolitesAir pollution exposureUntargeted metabolomicsPollutant exposureSteroid metabolic pathwaysPregnant womenInflammatory responseDisease continuumReviewThe purposeHealth outcomesLarger sample sizeMetabolic pathwaysDisease statusPollution exposureIdentified metabolitesMetabolic perturbationsMetabolic changesSummaryOur reviewAir pollution componentsMetabolomic analysis
2020
Addressing the challenges of E-cigarette safety profiling by assessment of pulmonary toxicological response in bronchial and alveolar mucosa models
Ganguly K, Nordström A, Thimraj TA, Rahman M, Ramström M, Sompa SI, Lin EZ, O’Brien F, Koelmel J, Ernstgård L, Johanson G, Pollitt KJG, Palmberg L, Upadhyay S. Addressing the challenges of E-cigarette safety profiling by assessment of pulmonary toxicological response in bronchial and alveolar mucosa models. Scientific Reports 2020, 10: 20460. PMID: 33235237, PMCID: PMC7686373, DOI: 10.1038/s41598-020-77452-w.Peer-Reviewed Original ResearchConceptsElectronic cigarettesSafety profilingInjury/repairMucosa modelEpithelial barrier functionExpression of markersNicotine contentAnti-microbial defenseTissue injury/repairNicotine presenceHuman bronchialFlavoring agentBarrier functionLung modelOxidative stressEvidence-based policy recommendationsSignificant differencesRespiratory treeMulti-disciplinary approachLimited toxicity dataMultiple factorsAir-liquid interfaceSpecific roleToxicityCytotoxic compounds
2018
Metals and oxidative potential in urban particulate matter influence systemic inflammatory and neural biomarkers: A controlled exposure study
Liu L, Urch B, Szyszkowicz M, Evans G, Speck M, Van Huang A, Leingartner K, Shutt RH, Pelletier G, Gold DR, Brook JR, Godri Pollitt K, Silverman FS. Metals and oxidative potential in urban particulate matter influence systemic inflammatory and neural biomarkers: A controlled exposure study. Environment International 2018, 121: 1331-1340. PMID: 30420132, PMCID: PMC6396878, DOI: 10.1016/j.envint.2018.10.055.Peer-Reviewed Original ResearchConceptsUbiquitin C-terminal hydrolase L1Vascular endothelium growth factorBiomarker levelsPost exposureSystemic inflammationOxidative stressNeural biomarkersS100 calcium-binding protein BCalcium-binding protein BNeural functionHealthy non-smoking volunteersConcentrated ambient PMAssessment of biomarkersNon-smoking volunteersStress marker cortisolAmbient PMUrinary malondialdehydeUrinary biomarkersUrinary cortisolInterleukin-6Mixed regression modelsVanillylmandelic acidInflammationMean concentrationGrowth factor
2016
Murine precision-cut lung slices exhibit acute responses following exposure to gasoline direct injection engine emissions
Maikawa CL, Zimmerman N, Rais K, Shah M, Hawley B, Pant P, Jeong CH, Delgado-Saborit JM, Volckens J, Evans G, Wallace JS, Pollitt K. Murine precision-cut lung slices exhibit acute responses following exposure to gasoline direct injection engine emissions. The Science Of The Total Environment 2016, 568: 1102-1109. PMID: 27369091, DOI: 10.1016/j.scitotenv.2016.06.173.Peer-Reviewed Original ResearchConceptsLung slicesPulmonary responseBALB/c miceMurine precision-cut lung slicesOxidative stressPrecision-cut lung slicesOxidative stress markersOne-hour exposurePulmonary effectsC miceGDI engine exhaustAcute responseCYP1B1 expressionStress markersVivo modelPolycyclic aromatic hydrocarbon metabolismUpregulation of genesElectrostatic aerosolParticulate fractionAromatic hydrocarbon metabolismExposureUpregulated genesMRNA productionMetabolismAir-liquid interface
2013
PM2.5, oxidant defence and cardiorespiratory health: a review
Weichenthal SA, Godri Pollitt K, Villeneuve PJ. PM2.5, oxidant defence and cardiorespiratory health: a review. Environmental Health 2013, 12: 40. PMID: 23641908, PMCID: PMC3652795, DOI: 10.1186/1476-069x-12-40.Peer-Reviewed Original ResearchConceptsHealth effectsOxidant defenseAnti-oxidant related genesFurther evaluationOxidative stressCardiorespiratory health effectsLittle epidemiological evidenceAnti-oxidant supplementationPotential modifying roleAmbient air quality managementAcute health effectsImpact of polymorphismsHeart rate variabilityCardiorespiratory outcomesChronic outcomesRespiratory outcomesEpidemiological evidenceCardiorespiratory healthPM2.5 exposureHealth outcomesRate variabilityModifying roleExposure metricsOutcomesCommon outcome