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1 First Department of Medicine and 3 Central Research Institute, Hokkaido University School of Medicine, Sapporo 060-8638; and 2 Department of Pulmonary Medicine, Fukushima Medical University, Fukushima 960-1295, Japan
Macrophage migration inhibitory
factor (MIF) is a unique cytokine that reportedly overrides the
anti-inflammatory effect of endogenous glucocorticoids. MIF has been
demonstrated to be involved in a variety of inflammatory diseases. In
this study, we examined the role of MIF in bleomycin (BLM)-induced lung
injury and fibrosis. The levels of MIF in lung tissues and
bronchoalveolar lavage fluids were significantly increased in the
period 5-10 days after intratracheal administration of BLM.
Treatment with the anti-MIF antibody significantly reduced the
mortality at 14 days and the histopathological lung injury score at 10 days. These effects were accompanied with significant suppression of
the accumulation of inflammatory cells in the alveolar space and tumor
necrosis factor-
in the lungs at 7 days. However, the anti-MIF
antibody did not affect either the content of lung hydroxyproline or
the histopathological lung fibrosis score at 21 days after BLM. These
data provide further evidence for the crucial role of MIF in acute lung
inflammation but do not support the involvement of MIF in lung fibrosis
induced by BLM in mice.
macrophage migration inhibitory factor; bleomycin; lung fibrosis; tumor necrosis factor-
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