N-acetyicysteine prevents lps-lnduced pro-inflammatory cytokines and mmp2 production in gingival fibroblasts

  • Do Young Kim
  • Ji-Hae Jun
  • Hye-Lim Lee
  • Kyung Mi Woo
  • Hyun-Mo Ryoo
  • Gwan-Shik Kim
  • Jeong-Hwa Baek
  • Soo-Boo Han


Periodontitis is an inflammatory process that ultimately results in tooth loss. Although the primary etiologic agent for periodontitis is bacteria, the majority of periodontal tissue destruction is thought to be caused by an inappropriate host response. Reactive oxygen species (ROS) have been known to be involved in periodontal tissue destruction. We treated human gingival fibroblasts with lipopolysaccharide (LPS) obtained fromE. coli and the periodontopathogensActinobacillus actinomycetemcomitans andPorphyromonas gingivalis, and examined their inflammatory responses in the presence and absence of the antioxidant N-acetylcysteine (NAC). LPS enhanced ROS production, as well as, expression of pro-inflammatory cytokines such as interleukin-1β, interleukin-6, interleukin-8 and tumor necrosis factor-α, and the production and activation of MMP2. NAC suppressed all LPS-induced inflammatory responses examined, suggesting that LPS-induced ROS may play a major regulatory role in these responses in gingival fibroblasts. In addition, NAC prevented LPS-induced activation of p38 MAPK and JNK but not phosphorylation and subsequent degradation of IkB. These results indicate that NAC exerts anti-inflammatory effects in LPS-stimulated gingival fibroblasts, functioning at least in part via down-regulation of JNK and p38 MAPK activation. Furthermore, this work suggests that antioxidants may be useful in adjunctive therapies that complement conventional periodontal treatments.

Key words

Gingival fibroblasts LPS MMP2 N-Acetylcysteine Pro-inflammatory cytokines 


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Copyright information

© The Pharmaceutical Society of Korea 2007

Authors and Affiliations

  • Do Young Kim
    • 1
  • Ji-Hae Jun
    • 2
  • Hye-Lim Lee
    • 2
  • Kyung Mi Woo
    • 2
  • Hyun-Mo Ryoo
    • 2
  • Gwan-Shik Kim
    • 2
  • Jeong-Hwa Baek
    • 2
  • Soo-Boo Han
    • 1
  1. 1.Department of Periodontology, School of DentistrySeoul National UniversitySeoulKorea
  2. 2.Department of Cell and Developmental Biology, School of Dentistry and Dental Research InstituteSeoul National UniversitySeoulKorea

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