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2000 Fiscal Year Final Research Report Summary

Elucidation of the functional endotoxin receptor molecules by using antagonist structure of the lipid A.

Research Project

Project/Area Number 11670283
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Bacteriology (including Mycology)
Research InstitutionNATIONAL INSTITUTE OF HEALTH SCIENCES

Principal Investigator

TANAMOTO Ken-ichi  National Institute of Health Sciences, Bacteriology, Head, 衛生微生物部, 部長 (60107430)

Co-Investigator(Kenkyū-buntansha) MUROI Masasi  National Institute of Health Sciences, Bacteriology,, 衛生微生物部, 室長 (70311389)
Project Period (FY) 1999 – 2000
Keywordsendotoxin / lipid A / CD14 / species specificity / Toll-like receptors / MD-2 / Salmonella lipid A
Research Abstract

The stimulation of both THP-1 and U937 human-derived cells by Salmonella lipid A preparations from various strains as well as hexaacylated lipid A (506) and Salmonella-type hepataacylated lipid A (516), as assessed by TNF-α induction and NF-κB activation, was found to be inactive compared to Escherichia coli lipid A, but all of the lipid As exerted strongactivity on mouse cells and on Limulus gelation activity. Both lipid A preparations strongly induced TNF-α release and activated NF-κB in mouse peritoneal macrophages and mouse macrophage-like cell line J7741 and induced Limulus gelation activity. In addition, both 516 and lipid A from Salmonella were found to antagonize the 506 and E.coli, LPS action that induced TNF-α release and NF-κB activation in THP-1 cells. The mechanism of the species specificity exhibited by Salmonslla lipid A was elucidated on molecular basis. Salmonella lipid A was revealed to act as an agonist on human macrophages when mouse (m)TLR2 and mMD-2 was transfecte … More d. However, when the mMD-2 was replaced with human (h)MD-2 in the same experiment, the activity reduced drastically. The results show that MD-2 plays a predominant role for the species specificity of Salmonella lipid A.In the course of the study we also found that lipid A preparations from E.coli Salmonella abortus equi and Salmonella minnesota failed to activate NF-κB-dependent luciferase activity in 293 cells transiently expressing TLR2 and CD14, although all of these preparations strongly induced the degradation of IκB- NF-κB α in a mouse macrophage cell line J7741. Both of synthetic lipid A compounds, 506 and 516, also failed to activate NF-κB-dependent luciferase activity and to induce the translocation of NF-κB p65 subunit into nuclei in 293 cells transiently as well as stably expressing TLR2 and CD14 of both human or mouse origin. These results indicate that TLR2/CD14 complex does not recognize E.coli and Salmonella lipid A molecules and support the notion that TLR2 is not an essential molecule for endotoxin signaling. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] K.Tanamoto: "Biological property of lipid A isolated from Flavobacterium meningosepticum."Clinical & Diagnostic Laboratory Immunology. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanamoto: "Endotoxic property of lipid A from Comamonas testosteroni.."Microbiology. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安住聡子: "サルモネラリピドAはヒト細胞を活性化しない"エンドトキシン研究. 3. 51-57 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanamoto: "Biological property of lipid A isolated from Flavobacterium meningosepticum."Clinical & Diagnostic Laboratory Immunology. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanamoto: "Endotoxic property of lipid A from Comamonas testosteroni"Microbiology. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tanamoto, K., H.Kato, Y.Haishima & S.Azumi: "Biological property of lipid A isolated from Flavobacterium meningosepticum."Clinical & Diagnostic Laboratory Immunology. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanamoto, K., T.Iida, Y.Haishima & S.Azumi: "Endotoxic property of lipid A from Comamonas testosteroni."Microbiology. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanamoto K & Azumi S.: "Salmonellatype heptaacylated lipid A is inactive and acts as an antagonist of LPS action on human line cells"J.Immunol.. 164. 3149-3156 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Azumi S., & K.Tanamoto: "Anti-endotoxin properties of cinnamon bark-derived compound and its effect on the endotoxin shock model."J.Endotoxin Res. 5. 109-117 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanamoto K.: "Induction of lethal shock and tolerance by Porphyromonas gingivalis lipopolysaccharide in D-galactosamine-sensitized C3H/HeJ mice."Infect. Immun.. 67. 3399-3402 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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