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Studies on the bone resorption of radicular cyst

Research Project

Project/Area Number 62570906
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 外科・放射線系歯学
Research InstitutionNihon University

Principal Investigator

IZUMI Hirotsugu  Nihon University, Professor, 松戸歯学部, 教授 (00050005)

Co-Investigator(Kenkyū-buntansha) OGURA Naomi  Nihon University, Assistant, 松戸歯学部, 副手 (10152448)
MINATO Koichi  Nihon University, Research Associate, 松戸歯学部, 助手 (10174088)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsHuman gingival fibroblast / Human gingival carcinoma cell(Ca 9-22) / Bacteroides endodontalis / Prostaglandin E_2 / Plasmin / Elastase / Bacteroi des endodontalis / プロスタグランジンE2
Research Abstract

Although the expansion of radicular cyst has been attributed to osmotic pressure, more physiological explanation, in terms of cellular resorption ob bone and connective tissue destruction, has emerged. Recently, several kinds of anareobic microorganisms have been isolated from infected dencal root canals and odontogenic abscesses. In this study, protease activities of various microorganisms isolated from infected root canals and odontogenic abscesses were evaluated using synthetic protease substrates, and the effect of microorganism on the secretion of prostaglandin E2 NPGE2) and proteased from monolayer culture cells of gingival fibroblasts and endotherial cells were examined. B. endodontalis (B.e) produced gly-pro peptidase and kallikrein-like protease, B. gingivalis produced trypsin-like protease, kallikrein like protease, and gly-pro peptidase, and B. intermedius produced cathepsin H-like protease and gly-pro peptidase. B.e, a putative pathogen of radicular cyst, induced monolayer cultures of human gingival fibroblasts to synthesize PGE2, but those of human gingival carcinoma cell line (Ca 9-22: squamous endothelial cell) did not synthesize PGE2. Furthermore, B.e stimulated the secretion of plasmin from human gingival cells in monolayer cultures, and also stimulated the secretion of elastase from Ca 9-22. These data suggests that one way in which pathogens of microorganisms might directly mediate connective tissue destruction through production of various proteases, furthermore indirect way, B.e stimulated the production of PGE2 and plasmin from gingival fibroblasts and elstase from gingival endothelial cells. Since PGE2 is a potent mediator of bone resorption and elastase inhibits the activity of TIMP, an inhibitor of collagenase, from polymorphonuclear cells, this microorganism may play an important role in the formation or growth of radicular cysts.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report

Research Products

(9 results)

All Other

All Publications (9 results)

  • [Publications] 小倉直美、湊耕一、泉廣次: 日大口腔学.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 小倉直美、湊耕一、泉廣次: 日大口腔化学.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 小倉直美、湊耕一、泉廣次: 日大口腔化学.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Naomi Ogura; Koichi Minato; Hirotsugu Izumi: "The stimulation of prostaglandin E_2 synthesis from human gingival fibroblast by Bacteroides endodontalis" Nihon University Journal of Oral Science in preparation.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Naomi Ogura; Koichi Minato; Hirotsugu Izumi: "The stimulation of plasmin secretion from human gingival fibriblast by Bacteroides endodontalis" Nihon University Journal of Oral Science in preparation.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Naomi Ogura; Koichi Minato; Hirotsugu Izumi: "The stimulation of elastase secretion from human gingival carcinoma cell line, Ca 9-22 spuamous endothelial cell by Bacteroides endodontalis" Nihon University Journal of Oral Science in preparation.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 小倉直美、湊耕一、泉廣次: 日大口腔科学.

    • Related Report
      1988 Annual Research Report
  • [Publications] 小倉直美、湊耕一、泉廣次: 日大口腔科学.

    • Related Report
      1988 Annual Research Report
  • [Publications] 小倉直美、湊耕一、泉廣次: 日大口腔科学.

    • Related Report
      1988 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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