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Published ahead of print on November 1, 2006, doi:10.1165/rcmb.2006-0293OC

Am. J. Respir. Cell Mol. Biol., Volume 36, Number 4, April 2007, 460-465

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Submitted on August 10, 2006
Revised on October 26, 2006

Effect of Concentrated Ambient Particles on Macrophage Phagocytosis and Killing of S. pneumoniae

Hongwei Zhou1 and Lester Kobzik2*

1 Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA, 2 Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA; Department of Pathology, Brigham and Women's Hospital, Boston, MA, USA

* To whom correspondence should be addressed. E-mail: lkobzik{at}hsph.harvard.edu.

Particulate air pollution is linked to increased pneumonia epidemiologically and diminished lung bacterial clearance experimentally. We investigated the effect of concentrated ambient particles (CAPs,≤PM2.5) on the interaction of murine primary alveolar macrophages (AMs) and the murine macrophage cell line, J774 A.1, with Streptococcus pneumoniae. We found that CAPs increased binding of bacteria by both primary AMs and J774 cells (66.7±10.6% and 58.9±4.0%, respectively, n=4). In contrast to bacterial binding, CAPs decreased internalization in both AMs and J774 (55.4 ±8.5% and 54.7±5.1%, respectively, n=4). The rate of killing of internalized bacteria was similar, but CAPs caused a decrease in the absolute number of bacteria killed by macrophages, mainly due to decrease internalization. Additional analyses showed that soluble components of CAPs mediated the enhanced binding and decreased internalization of S. pneumoniae. Chelation of iron in soluble CAPs substantially reversed, while addition of iron as ferric ammonium citrate (FAC) restored inhibition of phagocytosis of S. pneumoniae in vitro. The results identify phagocytic internalization as a specific target for toxic effects of air pollution particles on alveolar macrophages.




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