The effects of the role of cytokine stimulated capsular polysaccharide Actinobacillus actinomycetemcomitans in human gingival fibroblast and monocyte.

2003 Fiscal Year Final Research Report Summary

• Project/Area Number: 14571805
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 病態科学系歯学(含放射線系歯学)
• Research Institution: Aichi-Gakuin University
• Principal Investigator: ISHIHARA Yuichi Aichi-Gakuin Univ., Dept. of Periodontology Sch. of Dent., Assistant Professor, 歯学部, 講師 (50261011)
• Co-Investigator(Kenkyū-buntansha): KOIDE Masanori Aichi-Gakuin Univ., Dept. of Periodontology Sch. of Dent., Assistant Professor, 歯学部, 助手 (10367617) ; OHGUCHI Masahiro Aichi-Gakuin Univ., Dept. of Periodontology Sch. of Dent., Assistant Professor (00319196)
• Project Period (FY): 2002 – 2003
• Keywords: Actinobacillus actinomycetemcomitans_ / polysaccharide / LPS / interleukin-6 / interleukin-8 / periodontitis / HGF / LPS

Research Abstract

We previously reported that a capsular polysaceharide (CP) from Actinobacillus actinomycetemcomitans Y4 induces bone resorption in a mouse organ culture system and osteoclast formation in mouse bone marrow cultures. However, the effects of A. actinomycetemcomitans Y4 CP on human gingival fibroblasts (HGF) are still unclear. The present study was undertaken to test the hypothesis that A. actinomycetemcomitans Y4 CP alters the production of inflammatory cytokines, such as interleukin-6 (IL-6) and IL-8 by HGF. When HGF were cultured with various concentrations of Y4 CP for 24 h, IL-6 and IL-8 production decreased in a concentration-dependent manner. Y4 CP (100 microg/ml) suppressed the release of IL-6 from 9.09 +/-0.08 ng/ml to 0.34 +/-0.21 ng/ml (P<0.01) and IL-8 production decreased from 3.76 +/-0.03 ng/ml to 0.09 +/-0.01 ng/ml (P<0.01). Y4 CP suppressed 70-80% of the release of IL-6 and IL-8 from HGF stimulated with Y4 lipopolysaccharide (LPS), too. Interestingly, anti-A. actinomycetemcomitans Y4 CP completely inhibited the effect of A. actinomycetemcomitans Y4 CP on IL-6 and IL-8 production from HGF. These results indicate that Y4 CP inhibits the release of IL-6 and IL-8 from HGF, suggesting that A. actinomycetemcomitans Y4 modulates the inflammatory response in periodontitis. Remarkably, this inhibitory effect was reversed by specific anti-A. actinomycetemcomitans Y4 CP suggesting an important relationship between the organism and the humoral host response.

Research Products

• [Publications] Barbour SE, Ishihara Y, Tew JG, et al.: "Monocyte differentiation in localized juvenile periodontitis is skewed toward the dendritic cell phenotype."Infection and Immunity. 70(6). 2780-2786 (2002)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Ohguchi Y, Ishihara Y, Noguchi T, et al.: "Capsular polysaccharide from Actinobacillus actinomycetemcomitans inhibits IL-6 and IL-8 production in human gingival fibroblast."Journal of Periodontal Research. 38. 1-8 (2003)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Koide M, Maeda H, Reddy SV, et al.: "Identification of the functional domain of osteoclast inhibitory peptide-1/hSca."Journal Bone Mineral Research. 17(1). 111-118 (2002)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] Ishihara Y. et al.: "Monocyte differentiation in localized juvenile periodontitis is skewed toward the dendritic cell phenotype."Infection and Immunity. 70(6). 2780-2786 (2002)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Koide M. et al.: "Identification of the functional domain of osteoclast inhibitory nentide-1/hSca."J. Bone Miner Research. 17. 111-118 (2002)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] Ishihara Y. et al.: "Capsular polysaccharide from Actinobacillus actino mycetemcomitans inhibits IL-6 and IL-8 production in human gingival fibroblast."Journal of Periodontal Research. 38(2). 191-197 (2000)
  • Description: 「研究成果報告書概要(欧文)」より