RESUMO
OBJECTIVE: The Family with sequence similarity 5 member C (FAM5C) has been suggested to contribute in aggressive periodontitis. However, there is no data regarding its role in chronic periodontitis. The aim of this study was to evaluate the FAM5C expression in chronic periodontitis and to study association of FAM5C with key immunoinflammatory markers. MATERIAL AND METHODS: Gingival biopsies were harvested from periodontally healthy subjects (n = 10) and chronic periodontitis subjects (n = 15). The levels of mRNA of FAM5C, interleukin (IL)-17, IL-6, IL-23, IL-10, IL-4, interferon-c, toll-like receptor (TLR)-2, TLR-4, osteoprotegerin (OPG), receptor activator of NF-κB ligand (RANKL), tumor necrosis factor (TNF)-a, transforming growth factor-b, transcription factor forkhead box p3, and transcription factor orphan nuclear receptor C2 were evaluated by real-time polymerase chain reaction. RESULTS: FAM5C mRNA levels were not different between periodontally healthy and diseased tissues (P > 0.05). Gene expressions of IL-17, TNF-a, OPG, RANKL, TLR-2, and TLR-4 were higher in periodontitis, when compared to periodontally healthy sites (P < 0.05), while no differences between groups were observed for the other genes evaluated (P > 0.05). There were no correlations between the gene expression of FAM5C and the other immunoinflammatory markers (P > 0.05). CONCLUSION: Within the limits of this study, it seems that FAM5C expression does not contribute to chronic periodontitis.
Assuntos
Periodontite Crônica/genética , Periodontite Crônica/metabolismo , Citocinas/genética , Proteínas de Ligação a DNA/genética , Mediadores da Inflamação/metabolismo , Proteínas Mitocondriais/genética , Adulto , Estudos de Casos e Controles , Citocinas/biossíntese , Proteínas de Ligação a DNA/biossíntese , Feminino , Expressão Gênica , Gengiva/patologia , Humanos , Interleucinas/biossíntese , Interleucinas/genética , Masculino , Pessoa de Meia-Idade , Proteínas Mitocondriais/biossíntese , Índice Periodontal , Projetos Piloto , Ligante RANK/biossíntese , Ligante RANK/genética , RNA Mensageiro/genética , Reação em Cadeia da Polimerase em Tempo Real , Estatísticas não Paramétricas , Receptor 2 Toll-Like/biossíntese , Receptor 2 Toll-Like/genética , Receptor 4 Toll-Like/biossíntese , Receptor 4 Toll-Like/genética , Fator de Necrose Tumoral alfa/biossíntese , Fator de Necrose Tumoral alfa/genéticaRESUMO
BACKGROUND/AIM: The purpose of this study was to determine the bacterial diversity in the subgingival plaque of subjects with generalized aggressive periodontitis by using culture-independent molecular methods based on 16S ribosomal DNA cloning. METHODS: Samples from 10 subjects with generalized aggressive periodontitis were selected. DNA was extracted and the 16S rRNA gene was amplified with the universal primer pairs 9F and 1525R. Amplified genes were cloned, sequenced, and identified by comparison with known 16S rRNA sequences. RESULTS: One hundred and ten species were identified from 10 subjects and 1007 clones were sequenced. Of these, 70 species were most prevalent. Fifty-seven percent of the clone (40 taxa) sequences represented phylotypes for which no cultivated isolates have been reported. Several species of Selenomonas and Streptococcus were found at high prevalence and proportion in all subjects. Overall, 50% of the clone libraries were formed by these two genera. Selenomonas sputigena, the species most commonly detected, was found in nine of 10 subjects. Other species of Selenomonas were often present at high levels, including S. noxia, Selenomonas sp. EW084, Selenomonas sp. EW076, Selenomonas FT050, Selenomonas sp. P2PA_80, and Selenomonas sp. strain GAA14. The classical putative periodontal pathogens, such as, Aggregatibacter actinomycetemcomitans, was below the limit of detection and was not detected. CONCLUSION: These data suggest that other species, notably species of Selenomonas, may be associated with disease in generalized aggressive periodontitis subjects.