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Journal of Biomedical Science

, Volume 10, Issue 1, pp 136–145 | Cite as

Induction of nitric oxide synthase in raw 264.7 macrophages by lipoteichoic acid fromStaphylococcus aureus: Involvement of protein kinase C- and nuclear factor-kB-dependent mechanisms

  • Chen-Tzu Kuo
  • Ling-Ling Chiang
  • Chun-Nin Lee
  • Ming-Chih Yu
  • Kuan-Jen Bai
  • Horng-Mo Lee
  • Wen-Sen Lee
  • Joen-Rong Sheu
  • Chien-Huang Lin
Original Paper
  • 80 Downloads

Abstract

This study investigates the signaling pathway involved in inducible nitric oxide synthase (iNOS) expression and nitric oxide (NO) release caused byStaphylococcus aureus lipoteichoic acid (LTA) in RAW 264.7 macrophages. A phosphatidylcholine-phospholipase C (PC-PLC) inhibitor (D-609) and a phosphatidylinositol-phospholipase C (PI-PLC) inhibitor (U-73122) attenuated LTA-induced iNOS expression and NO release. Two PKC inhibitors (Go 6976 and Ro 31-8220), an NF-κB inhibitor (pyrrolidine dithiocarbamate; PDTC), and long-term (24 h) 12-phorbol-13-myristate acetate (PMA) treatment each also inhibited LTA-induced iNOS expression and NO release. Treatment of cells with LTA caused an increase in PKC activity; this stimulatory effect was inhibited by D-609, U-73122, or Ro 31-8220. Stimulation of cells with LTA caused IκB-α phosphorylation and IκB-α degradation in the cytosol, and translocation of p65 and p50 NF-κB from the cytosol to the nucleus. Treatment of cells with LTA caused NF-κB activation by detecting the formation of NF-κB-specific DNA-protein complexes in the nucleus; this effect was inhibited by Go 6976, Ro 31-8220, long-term PMA treatment, PDTC,L-1-tosylamido-2-phenylethyl chloromethyl ketone (TPCK), and calpain inhibitor I. These results suggest that LTA might activate PC-PLC and PI-PLC to induce PKC activation, which in turn initiates NF-κB activation, and finally induces iNOS expression and NO release in RAW 264.7 macrophages.

Key Words

Lipoteichoic acid Inducible nitric oxide synthase Nitric oxide Protein kinase C NF-κB RAW 264.7 macrophages 

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Copyright information

© National Science Council 2003

Authors and Affiliations

  • Chen-Tzu Kuo
    • 1
  • Ling-Ling Chiang
    • 4
  • Chun-Nin Lee
    • 2
  • Ming-Chih Yu
    • 2
  • Kuan-Jen Bai
    • 2
  • Horng-Mo Lee
    • 1
  • Wen-Sen Lee
    • 3
  • Joen-Rong Sheu
    • 3
  • Chien-Huang Lin
    • 1
    • 4
  1. 1.Graduate Institute of Biomedical TechnologyTaiwan, ROC
  2. 2.Department of Thoracic MedicineTaipei Medical University Affiliated Wang-Fang HospitalTaiwan, ROC
  3. 3.Graduate Institute of Medical SciencesTaipei Medical UniversityTaipeiTaiwan, ROC
  4. 4.School of Respiratory TherapyTaipei Medical UniversityTaipeiTaiwan (ROC)

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