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Involvement of hydrogen peroxide in asbestos-induced NFAT activation

  • Jingxia Li
  • Chuanshu Huang
  • Bihui Huang
  • Xianglin Shi
  • Vincent Castranova
  • Val Vallyathan
Chapter
  • 409 Downloads
Part of the Developments in Molecular and Cellular Biochemistry book series (DMCB, volume 37)

Abstract

The present study investigated the role of reactive oxygen species (ROS) in activation of nuclear factor of activated T cells (NFAT), a pivotal transcription factor responsible for regulation of cytokines, by asbestos in mouse embryo fibroblast PW cells. Exposure of cells to asbestos led to the transactivation of NFAT in a time-and dose-dependent manner. Scavenging of asbestos-induced H2O2 with N-acety-L-cyteine (NAC, a general antioxidant) or catalase (a specific H2O2 inhibitor) resulted in inhibition of NFAT activation. In contrast, an increase in H2O2 generation by the addition of superoxide dismutase (SOD) slightly enhanced asbestos-induced NFAT activation. In addition, pretreatment of cells with sodium formate did not exhibit any inhibition of NFAT activity induced by asbestos. These results demonstrated that H2O2 appeared to play an important role in asbestos-induced NFAT transactivation. Furthermore, it was observed that incubation of cells with 12-O-tetradecanoylphorbol-13-acetate (TPA) not only resulted in NFAT activation by itself, but also enhanced asbestos-induced NFAT induction. Pretreatment of cells with cyclosporin A (CSA), a pharmacological inhibitor of the phosphatase calcineurin, blocked both asbestos-and TPA plus asbestos-induced NFAT activation. These data suggest that asbestos is able to induce NFAT activation through H202-dependent and CSA-sensitive pathways, which may be involved in asbestos-induced carcinogenesis. (Mol Cell Biochem 234/235: 161–168, 2002)

Key words

reactive oxygen species NFAT asbestos 

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Copyright information

© Springer Science+Business Media New York 2002

Authors and Affiliations

  • Jingxia Li
    • 1
  • Chuanshu Huang
    • 1
  • Bihui Huang
    • 1
  • Xianglin Shi
    • 2
  • Vincent Castranova
    • 2
  • Val Vallyathan
    • 2
  1. 1.Nelson Institute of Environmental MedicineNew York University School of MedicineTuxedoNY
  2. 2.Health Effects Laboratory DivisionNational Institute for Occupational Safety and HealthMorgantownUSA

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