PMID: 11919075Mar 29, 2002Paper

Production of eosinophilic chemokines by normal pleural mesothelial cells

American Journal of Respiratory Cell and Molecular Biology
Hitoshi KatayamaK Hirai

Abstract

Eosinophilic pleural effusion occurs in many diseases. The mechanisms of eosinophil accumulation are not well understood. We showed previously that eotaxin was readily detectable in most pleural effusions, and its concentration significantly correlated with eosinophil number. To test the hypothesis that pleural eotaxin is produced by resident mesothelial cells, we examined its production by normal pleural mesothelial cells (NPMC). Eotaxin was induced by tumor necrosis factor (TNF)-alpha or interleukin (IL)-4 and was drastically increased by their combination. In contrast, interferon (IFN)-gamma inhibited eotaxin production. Regulated on activation, normal T cells expressed and secreted (RANTES) was also induced by TNF-alpha and was drastically increased by the addition of IFN-gamma. These effects were observed at both protein and mRNA levels. Stabilization of RANTES mRNA was observed with IFN-gamma but not IL-4; neither cytokine stabilized eotaxin mRNA. Eosinophil chemoattractant activity in culture supernatants of NPMC stimulated with TNF-alpha plus IL-4 was diminished by an anti-eotaxin antibody; that induced by TNF-alpha plus IFN-gamma was attenuated by an anti-RANTES antibody. Thus, NPMC can produce eotaxin, and different c...Continue Reading

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