pm health effects: susceptible populations
TRANSCRIPT
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PM Health Effects: Susceptible Populations
Mark J. UtellUniversity of Rochester Particulate
Matter Center
EPA Particulate Matter Research Centers ProgramWashington, D.C.
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Susceptible Populations: What Did We Understand In 1998?
• The lung was the portal of entry and the target organ for PM
• Susceptible populations were primarily those with underlying lung disease
• Evidence was emerging linking PM with cardiac mortality and hospital admissions
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Acute Mortality Associated with Ambient PM Concentration
Schwartz et al., 1992
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Who is Susceptible?
• Elderly populations• Children• Cardiovascular disease - atherosclerosis -
MI, arrhythmia, congestive heart failure• Diabetics• Acute and chronic lung disease -- asthma,
COPD, respiratory infections
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Susceptible Populations: PM Dosimetry
• Total mass or numbers of particles deposited in the lung may be a susceptibility modifier
• Respiratory diseases effect total PM deposition, distribution and clearance
• Activity state also effects total deposition
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Rest Exercise0
0.2
0.4
0.6
0.8
1
Nu
mb
er D
epo
siti
on
Fra
ctio
n
Healthy
Asthma
p<0.001
Total Respiratory Deposition of UFPp<0.001
PM and Health : Susceptibility Respiratory Deposition of UFP
Chalupa et al., 2004
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Dosimetry & Fate of Deposited PM
NORMAL
COPD
PM Xenon
0
0.05
0.1
0.15
0.2
0.25
0.3
Normal
SAD
COPD
Diameter = 1 µm
Smoker
AsthmaFractional Deposition
Bennett et al., 1993, 2002 Kim et al., 1997
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Susceptible Populations: Elderly
• Panel studies and clinical inhalation studies reveal changes in blood coagulation and cardiac function
• Studies with older animals demonstrate markers of increased susceptibility
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Exposure of Elderly People to CAPs Causes Decreased HRV
**
SDNN PNN50 LF HF Total Ratio0
1
2
3
4
Air
CAPS
Rat
io C
APS
/ Pr
e• Elderly subjects were exposed to clean air and concentrated
ambient air particles (CAPs) for 2 hours, on two separate occasions
• HRV was assessed immediately hours after exposure.
Devlin et al., 2002
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Effect of Age on Macrophage MIPEffect of Age on Macrophage MIP--2 Production 2 Production
Young Old
MIP
-2 p
g/m
l
0
1000
2000
3000
4000
5000
CONTROL50 ug CARBON/IRON + 1 NG/ML LPS50 ug CARBON/IRON
Finkelstein et al., 2003
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Susceptible Populations: CVD
• Epidemiologic studies have linked underlying ischemic disease with MI, arrhythmia, and CHF
• Panel studies have confirmed susceptibility of elderly with CVD
• Animal studies demonstrate ischemic events in animals with coronary narrowing
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PM Can Trigger Myocardial Infarction
772 MI patients who survived 24-hours and completed interview
OR = 1.48 (1.09-2.02) for a 25 µg/m3 increment in two-hour PM2.5
OR = 1.69 (1.13-2.34) for a 20 µg/m3 increment in 24-hour PM2.5
Peters et al., 2001
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Association Between PM and HRV in Elderly People with CV Disease
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
Healthy Subjects Compromised Subjects
HF LF HF LF
Hea
rt R
ate
Varia
bilit
y
Liao et al., 2000
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Canine Myocardial Ischemia Model
• Implantation of balloon occluder for coronary artery occlusion
• 5 min occlusions with CAPs or Sham exposures.
Wellenius et al
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Wellenius et al., 2002
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Susceptible Populations: Diabetics
• Diabetes is characterized by disturbances in cardiovascular risk factors - increased WBC counts and fibrinogen - and adverse vascular events
• The disease is associated with endothelial dysfunction which further increases the risk for cardiovascular events
• The incidence of diabetes is increasing
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Zanobetti et al, 2002
Percent Increases in Admissions for 10 µg/m3 Increase in PM10:Results of Meta-Regression in Four Cities.
Age Diabetes
With Without
% (95% C.I.) % (95% C.I.)
Young 1.6 (1.2-2.0) 0.9 (0.6-1.1)
Old 2.0 (1.6-2.4) 1.3 (1.0-1.5)
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Susceptible Populations: Lung Disease
• Panel studies link PM with an increase in asthma symptoms and medication use
• Animal models demonstrate relationships between chronic lung disease, lung inflammation and respiratory infections
• Clinical studies suggest possible basis for transition to asthma
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Lung Disease: Asthma & PM• 133 children with asthma; 58 days of data/child• Daily symptoms (wheeze, sob); Daily PM2.5• 18% (5-33%) increased risk of a symptom/10 µg/m3
increase in PM2.5 (Yu, et al. 2000)
• Children with asthma (CAMP study)• PM2.5 lagged one day was associated with a 1.2 times
increased odds of asthma attack and 1.08-fold increase in use of rescue medication (Slaughter, et al. 2003)
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Clarke et al.,1999 Kodavanti et al., 2000
0500
Air CAPs Air
BALF
Pro
tein (µg
/ml)
~500ug/m3 x 3 days
CAPs
1500
2500
3500
4500
Boston
0100
300
500
700
900
Air CAPs AirBA
LF P
rote
in (µg
/ml)
~600ug/m3 x 2 days
CAPs
RTP
CAPs causes Pulmonary Inflammation in Bronchitic Rats
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Diesel Exhaust Particles (Nasal instillation)• Enhance local mucosal IgE production• Induce an inflammatory response of cells,
chemokines and cytokines
Diesel Exhaust Particles Plus Allergen• Enhance local antigen specific IgE production• Deviate cytokine production toward a TH2 profile• Drive in vivo isotype switch to IgE
Diaz-Sanchez et al., 1992, 1999
Effects of DEP on Human In Vivo Allergic Responses
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Susceptibility: Areas of Future Emphasis
• Pregnancy and pregnancy outcomes: low birth weights and prematurity
• Children: reduced lung growth• Neurological disease: transmission of
particles to the brain, e,g,. Alzheimer’s disease
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Susceptibility: Areas ofFuture Emphasis
• Systemic disease states which we have never considered linked to environmental exposures are yet to be explored - e.g., lupus, arthritis and other systemic inflammatory diseases
• Implications for engineered nanoparticles• Genes and Polymorphism - the interaction
of environment and genes