Source category-specific PM2.5 and urinary levels of Clara cell protein CC16. The ULTRA study.
BACKGROUND
We have previously reported that outdoor levels of fine particles (PM(2.5), diameter <2.5 microm) are associated with urinary CC16, a marker for lung damage, in Helsinki, Finland, but not in the other two ULTRA cities (Amsterdam, The Netherlands, and Erfurt, Germany). We here evaluated whether PM(2.5) from specific source categories would be more strongly associated with CC16 than (total) PM(2.5). In addition, we compared two source apportionment methods.


METHODS
We collected biweekly spot urinary samples over 6 months from 121 subjects with coronary heart disease for the determination of CC16 (n = 1251). Principal component analysis (PCA) was used to apportion daily outdoor PM(2.5) between different source categories. In addition, the multilinear engine (ME) was used for the source apportionment in Amsterdam and Helsinki. We analyzed associations of source category-specific PM(2.5) and PM(2.5) absorbance, an indicator for combustion originating particles, with logarithmized values of CC16 adjusting for urinary creatinine using multivariate mixed models in STATA.


RESULTS
In the pooled analyses, CC16 was increased by 0.6% (standard error 0.3%) per 1 x 10(-5) m(-1) increase in the same-day levels of PM(2.5) absorbance. Source category-specific PM(2.5) concentrations were not consistently associated with the levels of CC16 in the three cities. Correlations between source category-specific PM(2.5) determined using either PCA or ME were in general high. Associations of source category-specific PM(2.5) with CC16 in Amsterdam and Helsinki were statistically less significant when ME was used.


CONCLUSIONS
The present results suggest that PM(2.5) from combustion sources increases epithelial barrier permeability in lungs.
Centre for Research in Environmental Epidemiology, Municipal Institute of Medical Research, Barcelona, Spain. benedicte.jacquemin@inserm.fr
Bénédicte
B
Jacquemin
Timo
T
Lanki
Tarja
T
Yli-Tuomi
Marko
M
Vallius
Gerard
G
Hoek
Joachim
J
Heinrich
Kirsi
K
Timonen
Juha
J
Pekkanen
D000368:Aged; D000397:Air Pollution / Q000009:adverse effects*; D015415:Biomarkers / Q000652:urine; D002463:Cell Membrane Permeability / Q000187:drug effects / Q000502:physiology; D005260:Female; D005387:Finland; D005858:Germany; D006801:Humans; D019570:Inhalation Exposure / Q000009:adverse effects*; D008168:Lung / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D008297:Male; D009426:Netherlands; D010316:Particle Size; D052638:Particulate Matter / Q000009:adverse effects* / Q000737:chemistry; D020545:Respiratory Mucosa / Q000737:chemistry / Q000187:drug effects / Q000502:physiology; D014598:Uteroglobin / Q000652:urine*
D015415:Biomarkers; D052638:Particulate Matter; C556389:SCGB1A1 protein, human; D014598:Uteroglobin