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Indoor air pollutants stimulate interleukin-8-specific mRNA expression and protein secretion of alveolar macrophages.

Abstract：

:Indoor air pollutants may cause inflammatory changes of the airways and adjacent pulmonary tissue. After phagocytosis of inhaled particles alveolar macrophages (AM) release chemotactic mediators capable of attracting inflammatory cells into the lung tissue. To evaluate these mechanisms further peripheral blood mononuclear cells (PBMNC) and human AM (freshly recovered from the lower respiratory tract) were exposed to the indoor particles Soot FR 101 and Printex 90, the asbestos fiber Chrysotile B, and titanium dioxide (TiO2) at concentrations of 10 or 50 microg/10(6) cells for up to 8 h. The migration of granulocytes into the conditioned supernatants of AM and PBMNC was quantified by chemotaxis assay in a Boyden chamber. Granulocyte migration increased by 42.3 +/- 25.8% (Chrysotile B), 64. 6 +/- 18.3% (FR 101), 74.2 +/- 16.5% (P 90), and 86.7 +/- 25.6% (TiO2) in AM-conditioned supernatants (p < 0.05). Qualitative, Interleukin (IL)-8 specific reverse transcriptase-polymerase chain reaction was performed after exposure of AM or PBMNC to Chrysotile B, FR 101, P 90, and TiO2 at concentrations of 10 and 50 microg/10(6) cells for 90 min. Each of the tested particles caused an increase in IL-8-specific mRNA expression of AM or PBMNC after particle exposure compared with the unexposed control. To find out if IL-8, the most powerful granulocyte chemokine, is involved, supernatants were preincubated with anti-IL-8. Granulocyte migration decreased by up to 35 +/- 15% (50 ng/ml anti-IL-8) and 41.5 +/- 16% (100 ng/ml anti-IL-8) (p < 0.0625) in AM-conditioned supernatants. Pretreatment of the granulocytes with human IL-8 decreased by up to 59 +/- 18% (10 ng/ml) (p < 0.0625) in AM-conditioned supernatants. Similar reaction patterns were observed using anti-IL-8-pretreated supernatants of particle-exposed PBMNC. In conclusion, indoor air pollutants may promote inflammatory changes in the lung via IL-8 release by alveolar macrophages.

journal_name

Lung

journal_title

Lung

authors

Drumm K,Schindler H,Buhl R,Küstner E,Smolarski R,Kienast K

doi

10.1007/pl00007628

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

9-19

issue

1

eissn

0341-2040

issn

1432-1750

journal_volume

177

pub_type

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