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Träfflista för sökning "WFRF:(Eklund A) ;pers:(Skold CM)"

Sökning: WFRF:(Eklund A) > Skold CM

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  • Zetterberg, G, et al. (författare)
  • Rat alveolar and interstitial macrophages in the fibrosing stage following quartz exposure
  • 2000
  • Ingår i: Human & experimental toxicology. - : SAGE Publications. - 0960-3271 .- 1477-0903. ; 19:7, s. 402-411
  • Tidskriftsartikel (refereegranskat)abstract
    • Exposure to quartz induces pulmonary inflammation and development of fibrosis. In order to study the fibrosing process, we investigated morphology function and phenotype of alveolar (AMs) and interstitial (IMs) macrophages at an early stage of fibrosis in rats. Rats were exposed by intratracheal instillations of 10 mg quartz (n = 8) or saline (n = 8) and studied 3 months later. AMs were obtained by bronchoalveolar lavage and IMs by mechanical fragmentation, followed by enzymatic digestion of lung tissue. Histology revealed subacute silicosis, with early focal fibrosis and alveolar lipoproteinosis. AM quartz exposure increased phagocytic activity and expression of major histocompatibility complex (MHC) Ia antigens, the latter being associated with cellular antigen presenting capacity. IM had an even more pronounced expression of MHC than AM after quartz exposure. Both macrophage fractions had a higher expression of OX-42 (complement receptor 3, CR3) than controls, but the increase in the IM fraction might be explained by the remaining AM in the IM fraction. Exposed AM adhered less to extracellular matrix components (vitronectin and fibronectin) than controls. In contrast, the adhesion of IM to vitronectin increased after exposure. Besides increased adhesion, the effects on IM were scarce. Our results therefore do not support the hypothesis that IM has a key role in the process of inflammation, including fibrosis.
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