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1998 Fiscal Year Final Research Report Summary

Application of in situ PCR to the diagnosis of oral diseases

Research Project

Project/Area Number 08457562
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 矯正・小児・社会系歯学
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

OGUCHI Haruhisa  School of Dent., Hokkaido Univ., Pro., 歯学部, 教授 (30124689)

Co-Investigator(Kenkyū-buntansha) YOSHIHARA Toshihiro  School of Dent., Hokkaido Univ., Inst., 歯学部, 助手 (60261319)
KUDO Masaki  School of Dent., Hokkaido Univ., Inst., 歯学部, 助手 (10164500)
SHIRAKAWA Tetsuo  Dental Hospital, Hokkaido Univ., Lec., 歯学部, 講師 (00187527)
Project Period (FY) 1996 – 1998
Keywordsherpes simplex virus / Mycoplasma salivarium / saliva / polymerase chain reaction / nitric oxide / nitric oxide synthase / in situ hybridization
Research Abstract

A polymerase chain reaction (PCR) assay for the detection of the herpes simplex virus (HSV) and Mycoplasma salivarium (MS) was developed and the prevalence of those pathogenic organisms in human saliva was evaluated. The rapid PCR assay revealed HSV-positive saliva samples in 17.0% of the total samples from healthy children (n=241) with no symptomatic manifestation. A half of the saliva samples from healthy volunteers (age : 5-25) was revealed to be MS-positive. For the detection of the DNA fragment in sections in situ, in situ hybridization followed by the signal amplification with Biotin-Tyramide was more advantageous for the successful visualization of the DNA than conventional in situ PCR method.
We focused on nitric oxide (NO) as a biological marker of an inflammation, which is reported to be produced in many organs including oral tissues. Cultured human periodontal ligament (PDL) cells produced NO and the production was enhanced by stimulating the cells with cyclic tension forces. In unstimulated PDL cell culture, concentration of NO^2- and NO^3- (NO^2-/NO^3-) increased to 140% of the initial value during the first 12 h in newly exchanged medium. In contrast, NO2-/NO3- showed a 3-fold increase when the cells had been subjected to cyclic tension forces for 12 h. We employed RT-PCR method for the detection of NO synthases mRNA in the PDL cells. Endothelial NO synthases mRNA was expressed in both stimulated and unstimulated PDL cells whereas inducible NO synthases mRNA was detected in neither culturing condition.
These results suggest that 1) detection of the pathogenic organisms or the marker of inflammation by PCR is useful for the diagnosis of infectious oral diseases, and 2) human PDL cells produce NO by ecNOS and mechanically stimulated PDL cells modulate the functions of periodontal tissue by the upregulated NO production.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 吉原俊博ほか2名: "PCR法による唾液中の単純ヘルペスウイルス検出に関する研究" 小児歯科学雑誌. 35(5). 773-777 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshihara, T., Kaga, M., Oguchi, H.: "Detection of herpes simplex virus existence in the saliva of pediatric patients using the polymerase chain reaction." Jpn.J.Pediatr.Dent.35 (5). 773-777 (1997)

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

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Published: 1999-12-08  

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