アブストラクト(29巻4号:神奈川歯学)

神奈川歯学

Japanese

Title : 抗原性の異なるPorphyromonas gingivalis線毛の遺伝子クローニングと塩基配列の決定
Subtitle : 原著
Authors : 武田康篤, 梅本俊夫
Authors(kana) :
Organization : 神奈川歯科大学口腔細菌学教室
Journal : 神奈川歯学
Volume : 29
Number : 4
Page : 355-370
Year/Month : 1995 / 3
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 歯周炎の発症と進行には歯肉縁下細菌とその代謝産物が重要な役割を果たしている. 近年, 歯周病にはいくつかの型があり, それぞれに特定のグラム陰性嫌気性桿菌が関与していることが示唆されている. 特にPorphyromonas gingivalis(P.gingivalis)は成人性歯周炎や急速進行性歯周炎のポケットから高率かつ高頻度に分離され, 歯周病患者の本菌に対する血清抗体価が有意に高い値を示すことや本菌の増加と歯槽骨破壊の進行との間に相関が認められること等からこれらの歯周炎に関与する有力な病原性細菌と考えられている. 本菌の病原性に関しては, コラゲナーゼやトリプシン様酵素等の様々な蛋白分解酵素の作用が指摘されており, これらの酵素が直接に組織破壊を引き起こす可能性があることや, 歯周組織を構成する細胞から数種のサイトカインの産生を惹起させる内毒素が免疫系を刺激して組織障害を起こしたり, 遅延型アレルギー性病変を惹起している可能性が示唆されている.
Practice : 歯科学
Keywords : Porphyromonas gingivalis, 線毛遺伝子, クローニング

English

Title : Cloning and Sequencing of Antigenically Different Fimbrial Protein Gene from Porphyromonas gingivalis
Subtitle : Original article
Authors : Yasuatsu TAKEDA, Toshio Umemoto
Authors(kana) :
Organization : Department of Oral Microbiology, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 29
Number : 4
Page : 355-370
Year/Month : 1995 / 3
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : Fimbriae of Porphyromonas gingivalis have been thought to play an important role in the adherence to gingival tissue surfaces and are likely to be one of the important virulence factors. It has been reported that there are several antigenic groups in the fimbrial proteins of this species. We have found that the fimbriae of strain SU63 are distinct from those of the strain 381 in their molecular sizes, the first 20 N-terminal amino acid sequences and their antigenicities. A gene encoding the subunit protein of fimbriae, fimbrillin of P.gingivalis strain 381 (fimA) was cloned and sequenced. In this study, a gene (fimASU63) encoding the fimbrial subunit protein of the strain SU63 was cloned into the plasmid vector pBluescript II KS+ and was sequenced. The cloned gene could be expressed by the T7-RNA polymerase/ promoter system. On this system the recombinant fimbrillin protein (r-FimASU63) was detectable by SDS-PAGE. The location of the initiation codon was then determined by sequencing the N-terminal amino acids of the r-FimASU63. The amino acid sequence, deduced by the DNA sequence of the open reading frame of r-FimASU63, was shown to have 53% homology to that of the fimA of strain 381. The initiation codon of the N-terminal of r-FimASU63 was located 135-bp upstream of that of the purified fimbrillin protein, presumably because r-FimASU63 contained a signal peptide composed of 45 amino acid residues.
Practice : Dentistry
Keywords : Porphyromonas gingivalis