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The effects of components of periodontopathic bacteria on polymorphonuclear leukocytes from patients with diabetes mellitus.

Research Project

Project/Area Number 04671166
Research Category

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

Allocation TypeSingle-year Grants
Research Field Applied veterinary science
Research InstitutionKagoshima University

Principal Investigator

SETOGUCHI Takashi  Kagoshima University, Dental School, Assistant, 歯学部, 助手 (60206646)

Co-Investigator(Kenkyū-buntansha) KAMADA Tetsuro  Kasoshima University, Faculty of Medicine, Assistant, 医学部, 助手 (10204603)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
KeywordsPolymorphonuclear leukocyte / Diabetes mellitus / Superoxide / periodontitis associated bacteria / Lipopolysaccharide / Chemotaxis / Cytotoxicity
Research Abstract

The main cause of periodontal disease is bacteria in periodontal pocket. The host factors are also important in the progression of periodontal disease. The susceptibility to periodontal disease of diabetes mellitus (DM) patient is reported, but the mechanism is unknown. We examined the effects of lipopolysaccharide (LPS) from periodontal bacteria on Polymorphonuclear leukocytes (PMN) from DM patient.
We selected 20 DM patients and 16 healthy control. We examined
1) superoxide production by PMN stimulated with FMLP measured using chemiluminescence,
2) chemotaxis to FMLP using Boyden chamber methods,
3) membrane fluidity measured by fluorescence anisotropy technique. The superoxide production by PMN from DM patients was significantly higher than those from control. Chemotaxis and membrane fluidity were not significantly different. We extracted LPS from Porphyromonas gingivalis and Prevotella intermedia using hot water phenol methods. The LPS highly stimulated the superoxide production by PMN from DM patient than those from control. these results indicate the possibility that the superoxide produced by PMN affect the fibroblast in periodontal tissue.
We cultured gingival fibroblasts, stimulated the cells with PMN and LPS, and measured the release of LDH.The result was that the simultaneous stimulation of PMN and LPS was injurious to gingival fibroblasts. We will continue to examine which factor, superoxide, lysosomal enzyme or others, induce the change.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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