| Project/Area Number |
18592276
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Social dentistry
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| Research Institution | Osaka University |
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Principal Investigator |
KUBONIWA Masae Osaka University, Department of Preventive Dentistry, Assistant Professor (00303983)
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| Co-Investigator(Kenkyū-buntansha) |
NAGATA Hideki Osaka University, Department of Preventive Dentistry, Associate Professor (50260641)
KATAOKA Kosuke Osaka University, Department of Preventive Dentistry, Assistant Professor (50283792)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,730,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Streptococcus gordonii / Porphyromones gingivalis / biofilm / inter cellular signaling / intra cellular signaling / capsule / cell wall / quorum sensing / Fusobacterium nucleatum |
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| Research Abstract |
Dental plaque biofilm formation proceeds through a developmental pathway initiated by the attachment of pioneer organisms, such as S. gordonii, to tooth surfaces. Through a variety of synergistic interactions, pioneer organisms facilitate the colonization of later arrivals including P. gingivalis, a potential periodontal pathogen. We have investigated genes of S. gordonii required to support a heterotypic biofilm- community with P gingivalis. By screening a plasmid integration library of S gordonii, genes were identified that are crucial for the accumulation of planktonic R gingivalis cells into a multispecies biofilm. These genes were further investigated by specific mutation and complementation analyses. The biofilm-associated genes can be grouped into broad categories based on putative function as follows: i) intercellular or intracellular signaling (cbe and spxB), ii) cell wall integrity and maintenance of adhesive proteins (murE, msrA and atf), iii) extracellular capsule biosynthesis (pgsA and atf), iv) physiology (gdhA, ccmA and ntpB). In addition, a gene for a hypothetical protein was identified. Biofilm visualization and quantitation by confocal microscopy confirmed the role of these genes in the maturation of the multispecies community, including biofilm architectural development. The results suggest that S. gordonii governs the development of heterotypic oral biofilms through multiple genetic pathways.
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