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Elevated bronchoalveolar concentrations of MCP-1 in patients with pulmonary alveolar proteinosis

K Iyonaga, M Suga, T Yamamoto, H Ichiyasu, H Miyakawa, M Ando
European Respiratory Journal 1999 14: 383-389; DOI:
K Iyonaga
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M Suga
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T Yamamoto
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H Ichiyasu
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H Miyakawa
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M Ando
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Abstract

Pulmonary alveolar proteinosis (PAP) is a rare disease of unknown aetiology characterized by accumulations of lipoproteinaceous material within the alveoli. The alveolar macrophages become increasingly foamy, and are thought to have a role in the pathogenesis of PAP. However, the mechanisms of macrophage recruitment are unclear. In the bronchoalveolar lavage fluid (BALF) of four patients with PAP and 20 normal control subjects, the following were examined: the monocyte chemotactic activity due to the chemokine monocyte chemoattractant protein (MCP)-1 with the use of a chemotactic chamber assay, the levels of MCP-1 by enzyme-linked immunosorbent assay, and the MCP-1 expression on lavage cells by immunocytochemistry and in situ hybridization. The monocyte chemotactic activity in the BALF of the PAP patients was markedly elevated, and the activity was completely absorbed by treatment with anti-MCP-1. The MCP-1 levels in the BALF were surprisingly high in the PAP group (25,100+/-472 pg x mL(-1)), whereas low levels of MCP-1 were detected in the normal control subjects (mean: never smokers 4.8; smokers 10.4 pg x mL(-1)). MCP-1 protein and messenger ribonucleic acid were expressed by macrophages from the PAP patients, and the expression was reduced according to foaming of the cells; there were monocyte-like macrophages with strong expression, small foamy cells with moderate expression, large foamy cells with a faint expression of MCP-1, and ghost cells with no expression. However, the increase of macrophage number in the PAP BALF was relatively small. These data suggest that monocyte chemoattractant protein(-1) expression by alveolar macrophages represents an amplification mechanism for the recruitment of additional macrophages to the alveoli in pulmonary alveolar proteinosis. It is possible that an ingestion of an excess of alveolar materials in pulmonary alveolar proteinosis may impair the macrophage function and the survival, resulting in the lack of a prominent increase in the macrophage number in bronchoalveolar lavage fluid.

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Elevated bronchoalveolar concentrations of MCP-1 in patients with pulmonary alveolar proteinosis
K Iyonaga, M Suga, T Yamamoto, H Ichiyasu, H Miyakawa, M Ando
European Respiratory Journal Aug 1999, 14 (2) 383-389;

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Elevated bronchoalveolar concentrations of MCP-1 in patients with pulmonary alveolar proteinosis
K Iyonaga, M Suga, T Yamamoto, H Ichiyasu, H Miyakawa, M Ando
European Respiratory Journal Aug 1999, 14 (2) 383-389;
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