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Am J Physiol Lung Cell Mol Physiol 280: L1128-L1137, 2001;
1040-0605/01 $5.00
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Vol. 280, Issue 6, L1128-L1137, June 2001

Attenuation of bleomycin-induced pneumopathy in mice by monoclonal antibody to interleukin-12

Takashige Maeyama, Kazuyoshi Kuwano, Masayuki Kawasaki, Ritsuko Kunitake, Naoki Hagimoto, and Nobuyuki Hara

Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, Higashiku, Fukuoka 812-8582, Japan

We previously demonstrated essential roles of the Fas-Fas ligand (FasL) pathway in bleomycin-induced pneumopathy in mice. T lymphocytes and natural killer cells express FasL on activation and use it as a cytotoxic effector molecule. Because interleukin (IL)-12 is known to play a critical role in cell-mediated immunity, we investigated whether anti-IL-12 antibody treatment suppresses the development of this model. The anti-IL-12 antibody treatment decreased the number of apoptotic cells and the degree of inflammation and fibrosis in lung tissue. The results of RT-PCR showed that IL-12p40, IL-12 receptor (R) beta 2, interferon-gamma , tumor necrosis factor-alpha and FasL mRNAs were upregulated after bleomycin instillation. The upregulation of FasL, IL-12Rbeta 2, and tumor necrosis factor-alpha mRNA expression in lung tissue was suppressed by anti-IL-12 antibody treatment. The results of enzyme-linked immunosorbent assay showed that the levels of IL-12p40, but not of IL-12p70, were increased in lung tissue after bleomycin instillation. Although the increase in IL-12Rbeta 2 mRNA levels suggests that the T helper type 1 cell response may participate in lung injury, the increase in IL-12p40 supports T helper type 2 cell predominance in the fibrotic process of this model. The administration of anti-IL-12 antibody could be a novel therapy against lung injury and pulmonary fibrosis.

T helper type 1 cell; T helper type 2 cell; Fas-Fas ligand pathway; apoptosis


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