Modulation of IL-1 beta, IL-6, IL-8, TNF-alpha, and TGF-beta secretions by alveolar macrophages under NO2 exposure.
Activated alveolar macrophages (AMs) secrete interleukine (IL)-1 beta, IL-6, IL-8, tumor necrosis factor-alpha (TNF-alpha), and transforming growth factor-beta (TGF-beta), whose inflammatory and fibroblast-activating characteristics may play a role in the maintenance of pulmonary inflammatory processes and subsequent fibrosis. Human AMs were transferred to a gas cylinder and exposed to NO2 in concentrations ranging from 0.1 to 0.5 ppm in synthetic air for 30 min at 37 degree C. AMs were fixed on a polycarbonate membrane and placed on culture medium. A culture was established, with the exposed AM (nonstimulated or stimulated with 1 microgram/ml lipopolysaccharide [LPS]), and the remaining cells were used to determine the cytokines. IL-1 beta, IL-6, and IL-8 were quantified by commercial enzyme-linked immunosorbent assay kits (ELISA kits). TNF-alpha was determined with a "sandwich" ELISA, using the biotin-streptavidin system. NO2 exposure of nonstimulated AM did not result in changes in IL-1 beta, IL-6, TNF-alpha, and TGF-beta release, compared to the situation with control experiments. Exposure for 30 min to NO2 induced a significant decrease of LPS-stimulated IL-1 Beta, IL-6, IL-8, and TNF-alpha (p < .05). The release of TGF-beta was not significantly affected by NO2 exposure. Cytotoxicity of AM was checked by trypan blue exclusion, with values ranging from 1.3 to 3.0%. NO2 exposure of LPS-stimulated AM resulted in a functional impairment of AM after NO2 exposure regarding IL-1 beta, IL-6, IL-8, and TNF-alpha. Neither the spontaneous nor the stimulated release of TGF-beta were influenced by NO2.
Kienast
K
K
Third Department of Internal medicine, Johannes Gutenberg, University Hospital Mainz, Federal Republic of Germany.
Knorst
M
M
Müller-Quernheim
J
J
Ferlinz
R
R
D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007375:Interleukin-1 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D016209:Interleukin-8 / Q000378:metabolism; D016676:Macrophages, Alveolar / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009585:Nitrogen Dioxide / Q000494:pharmacology*; D010083:Oxidants, Photochemical / Q000494:pharmacology*; D016212:Transforming Growth Factor beta / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D016207:Cytokines; D007375:Interleukin-1; D015850:Interleukin-6; D016209:Interleukin-8; D010083:Oxidants, Photochemical; D016212:Transforming Growth Factor beta; D014409:Tumor Necrosis Factor-alpha; D009585:Nitrogen Dioxide