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. 2001 Dec;10(6):309–313. doi: 10.1080/09629350120102325

Role of ICAM-1 in the aggregation and adhesion of human alveolar macrophages in response to TNF-alpha and INF-gamma.

M Sasaki 1, Y Namioka 1, T Ito 1, N Izumiyama 1, S Fukui 1, A Watanabe 1, M Kashima 1, M Sano 1, T Shioya 1, M Miura 1
PMCID: PMC1781738  PMID: 11817671

Abstract

Intracellular adhesion molecule-1 (ICAM-1)-mediated cell-cell adhesion is thought to play an important role at sites of inflammation. Recent evidence suggests that ICAM-1 surface expression on alveolar macrophages is increased in pulmonary sarcoidosis and that inflammatory granuloma formation is characterized by the aggregation of macrophages. The present study shows that ICAM-1 expression is significantly elevated on alveolar macrophages from patients with sarcoidosis in response to tumor necrosis factor-alpha (TNF-alpha) and interferon-gamma (INF-gamma) compared with healthy controls. Aggregation and adhesion were significantly increased in alveolar macrophages treated with TNF-alpha and INF-gamma, and significantly inhibited in those pretreated with a monoclonal antibody to ICAM-1. Similarly, aggregation and adhesion were inhibited in macrophages treated with heparin, which then exhibited a wide range of biological activities relevant to inflammation. These results suggested that the surface expression of ICAM-1 on alveolar macrophages in response to TNF-alpha and INF-gamma is important in mediating aggregation and adhesion. Additionally, heparin may be useful for developing novel therapeutic agents for fibrotic lung disease.

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Selected References

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