Dual-immunohistochemistry provides little evidence for epithelial- mesenchymal transition in pulmonary fibrosis

Mizuho Yamada, Kazuyoshi Kuwano, Takashige Maeyama, Naoki Hamada, Michihiro Yoshimi, Yoichi Nakanishi, Michael Kasper

研究成果: ジャーナルへの寄稿記事

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epithelial-mesenchymal transition (EMT) has been considered to be involved in organ fibrogenesis. However, there is few direct evidence of this process in the pathophysiology of pulmonary fibrosis in vivo. Therefore, we tried to verify the involvement of this process in the development of pulmonary fibrosis. Since the co-expressions of epithelial and mesenchymal markers are thought to be a marker of EMT, we performed dual-immuunohistochemistry to assess the co-expressions of these proteins in lung tissues from bleomycin-induced pulmonary fibrosis in mice, and from patients with idiopathic pulmonary fibrosis, and nonspecific interstitial pneumonia. Double positive cells for epithelial markers including E-cadherin, T1α, or aquaporin 5, and a mesenchymal markers α-smooth muscle actin or vimentin were not found in bleomycin-induced pulmonary fibrosis in mice. Double positive cells for E-cadherin, ICAM-1, LEA, CD44v9, or SP-A and α-smooth muscle actin or vimentin were not found in lung tissues from normal lung parenchyma, idiopathic pulmonary fibrosis and nonspecific interstitial pneumonia. These results offer at least two possibilities. One is that EMT does not occur in IPF or bleomycin-induced pulmonary fibrosis in mice. Another is that EMT may occur in pulmonary fibrosis but the time during this transition in which cells express detectable levels of epithelial and mesenchymal markers is too small to be detected by double immunohistochemistry.

元の言語英語
ページ(範囲)453-462
ページ数10
ジャーナルHistochemistry and Cell Biology
129
発行部数4
DOI
出版物ステータス出版済み - 4 1 2008

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All Science Journal Classification (ASJC) codes

  • Histology
  • Molecular Biology
  • Medical Laboratory Technology
  • Cell Biology

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