RESUMO
<p><b>OBJECTIVE</b>To detect the presence and distribution of luxS gene in quorum sensing signal system in the periodontal pathogens.</p><p><b>METHODS</b>The total DNA of Porphyromonas gingivalis (Pg), Fusobacterium nucleatum (Fn), Actinobacillus acitinomycetimcomtans (Aa) were extracted. The presence of luxS was detected by polymerase chain reaction (PCR). The products of PCR were detected by electrophoresis, sequenced and identified by a Blast search of the GenBank database.</p><p><b>RESULTS</b>Electrophoresis, sequencing and Blast searching indicated that the PCR products of Pg were highly consistent with the luxS gene in GenBank. The sequencing result of Fn was also identified with the target gene. The PCR product of Aa was the same as reference through electrophoresis.</p><p><b>CONCLUSIONS</b>Pg, Fn, Aa contain luxS gene. Further studies may be required to investigate the functions of luxS in the periodontal pathogens.</p>
Assuntos
Aggregatibacter actinomycetemcomitans , Genética , Metabolismo , Proteínas de Bactérias , Genética , Metabolismo , Liases de Carbono-Enxofre , Genética , Metabolismo , Fusobacterium nucleatum , Genética , Metabolismo , Regulação Bacteriana da Expressão Gênica , Porphyromonas gingivalis , Genética , Metabolismo , Percepção de Quorum , Genética , Transdução de SinaisRESUMO
<p><b>OBJECTIVE</b>The ability of oral bacteria to adhere to tooth surface is associated with their pathogenicity. The objective of this study was to compare the ability of 4 strains of periodontal pathogens attaching to collagen-treated hydroxyapatite (C-HA) beads in order to evaluate the ability of the main periodontal pathogens to form the biofilm on root surface.</p><p><b>METHODS</b>The binding amount and binding percentage of 4 strains to C-HA were measured and compared by 3H-labeled binding assay. 4 strains of periodontal pathogens were Fusobacterium nucleatum (F. nucleatum) ATCC 10953, Porphyrin gingivalis (P. gingivalis) ATCC 33277, Prevotella intermedia (P. intermedia) ATCC 25611 and Hemophilic actinomycetemcomitans (H. actinomycetemcomitans) ATCC 29523.</p><p><b>RESULTS</b>The differences of the percentage of relative adherence between F. nucleatum ATCC 10953 and P. gingivalis ATCC 33277, as well as between H. actinomycetemcomitans ATCC 29523 and P. intermedia ATCC 25611 could not be observed. However, the percentage of relative adherence of F. nucleatum ATCC 10953 and P. gingivalis ATCC 33277 was higher than that of P. intermedia ATCC 25611 and H. actinomycetemcomitans ATCC 29523 (P<0.001), no matter cultured 24 h or 48 h. No significant difference of the percentage of the relative adherence of each stain between 24 h and 48 h cultured time could be found.</p><p><b>CONCLUSION</b>F. nucleatum and P. gingivalis exhibited strong binding ability to C-HA. Their adherence to root surface may play an important role in their local aggregation, biofilm formation during the development and recurrence of the periodontitis.</p>