Sensitivity of heterozygous α1,6-fucosyltransferase knock-out mice to cigarette smoke-induced emphysema: Implication of aberrant transforming growth factor-β signaling and matrix metalloproteinase gene expression

Congxiao Gao, Toshitaka Maeno, Fumi Ota, Manabu Ueno, Hiroaki Korekane, Shinji Takamatsu, Ken Shirato, Akio Matsumoto, Satoshi Kobayashi, Keiichi Yoshida, Shinobu Kitazume, Kazuaki Ohtsubo, Tomoko Betsuyaku, Naoyuki Taniguchi

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

We previously demonstrated that a deficiency in core fucosylation caused by the genetic disruption of α1,6-fucosyltransferase (Fut8) leads to lethal abnormalities and the development of emphysematous lesions in the lung by attenuation of TGF-β1 receptor signaling. Herein, we investigated the physiological relevance of core fucosylation in the pathogenesis of emphysema using viable heterozygous knock-out mice (Fut8+/-) that were exposed to cigarette smoke (CS). The Fut8+/- mice exhibited a marked decrease in FUT8 activity, and matrix metalloproteinase (MMP)-9 activities were elevated in the lung at an early stage of exposure. Emphysema developed after a 3-month CS exposure, accompanied by the recruitment of large numbers of macrophages to the lung. CS exposure substantially and persistently elevated the expression level of Smad7, resulting in a significant reduction of Smad2 phosphorylation (which controls MMP-9 expression) in Fut8+/- mice and Fut8-deficient embryonic fibroblast cells. These in vivo and in vitro studies show that impaired core fucosylation enhances the susceptibility to CS and constitutes at least part of the disease process of emphysema, in which TGF-β-Smad signaling is impaired and the MMP-mediated destruction of lung parenchyma is up-regulated.

Original languageEnglish
Pages (from-to)16699-16708
Number of pages10
JournalJournal of Biological Chemistry
Volume287
Issue number20
DOIs
Publication statusPublished - 2012 May 11

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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