RESUMO
Porphyromonas gingivalis alters cytokine expression in gingival epithelial cells, stimulating inflammatory responses that may lead to periodontal disease. This study explored the effect of Lactobacillus acidophilus on the specific expressions of the interleukins (ILs) IL1B, IL6, and IL8 induced by the pathogen. Human gingival epithelial cells were co-cultured with P. gingivalis, L. acidophilus, or L. acidophilus + P. gingivalis; the control group consisted of the cells alone. Protein and gene expression levels of the ILs were detected using ELISA and qRT-PCR, respectively. The supernatant from the P. gingivalis group held significantly higher protein and mRNA levels of IL1B, IL6, and IL8, compared to the control group. In the mixed bacterial group (L. acidophilus + P. gingivalis), the levels of all three ILs decreased with increasing concentrations of L. acidophilus and were significantly different from the P. gingivalis group. This suggests that in gingival cells, L. acidophilus offsets the P. gingivalis-induced secretion of these ILs in a dose-dependent manner.
Assuntos
Células Epiteliais/metabolismo , Gengiva/metabolismo , Interleucinas/metabolismo , Lactobacillus acidophilus/fisiologia , Porphyromonas gingivalis/imunologia , Células Cultivadas , Técnicas de Cocultura , Células Epiteliais/microbiologia , Gengiva/citologia , Gengiva/microbiologia , Humanos , Interleucina-1beta/genética , Interleucina-1beta/metabolismo , Interleucina-6/genética , Interleucina-6/metabolismo , Interleucina-8/genética , Interleucina-8/metabolismo , Interleucinas/genética , Periodontite/microbiologia , Periodontite/patologia , Probióticos , RNA Mensageiro/biossíntese , RNA Mensageiro/metabolismoRESUMO
PURPOSE: To evaluate the possible antagonistic effects of Lactobacillus acidophilus (La) and Bifidobacterium adolescents (Ba) on Porphyromonas gingivalis (Pg) and Fusobacteriurn nuclearum (Fn). METHODS: Cylinder plate method was used to observe the inhibition zone formation.The suspensions of periodontal pathogens were mixed with cell free solutions of probiotics respectively, to investigate the antagonistic effect on the production of probiotics. The data were analyzed by ANOVA using SAS 9.0 software package. RESULTS: La only inhibited the growth of Pg. The cell free extract of La also significantly inhibited the growth of Pg (P<0.001). There was no antagonistic effect of Ba on the two periodontal pathogens. CONCLUSIONS: La strongly inhibits the growth of Pg by its metabolites. The new strategy of confining periodontal pathogens with La as ecological modulator is worthy of further study.