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Conference Paper: Crosstalk of human oral keratinocytes with commensal and pathogenic bacteria

TitleCrosstalk of human oral keratinocytes with commensal and pathogenic bacteria
Authors
KeywordsCytokine
Host-microbial interactions
Immunology
Periodontal disease
Periodontics
Issue Date2011
PublisherThe International Association for Dental Research.
Citation
The 25th Annual Scientific Meeting of the IADR-SEA Division and the 22nd Annual Meeting of SEAADE, Singapore, 28-30 October 2011. How to Cite?
AbstractOBJECTIVES: Periodontal disease is initiated by a microbial shift from commensal plaque biofilm to pathogenic one which results in destructive inflammatory response. Hitherto only sparse data are available on the molecular mechanisms which govern the harmonious bacteria-host interaction in healthy status and regulate the microbial shift concerned. This preliminary study aimed to investigate the molecular mechanisms by which commensal and periodontopathic bacteria communicate with human oral keratinocytes (HOKs), and to determine the effects of bacterial DNA on the cytokine expression in HOKs. METHODS: Commensal bacteria Streptococcus mutans (Sm), Actinomyces israelii (Ai) and periodontopathic bacteria Actinomyces actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg) were used in the study. Sm and Aa as well as the purified DNAs of Sm, Ai, Aa and Pg were co-cultured with HOKs respectively. IL-6, IL-8 and TNF-alpha were analyzed by ELISA. The effects of Aa- and Pg DNA on the expression of Toll-like receptors (TLRs) related signal transduction pathways in HOKs were examined by western blots, qPCR and PCR array. RESULTS: Sm and Aa up-regulated the expression of IL-6 and IL-8 in HOKs through different signaling pathways. Aa induced p65 MAPK pathway after 30 min co-culture with HOKs. The DNAs of Sm, Ai, Aa and Pg enhanced the expression of IL-6 and IL-8 in HOKs. Pg DNA activated TLR signaling pathway. CONCLUSION: This study suggests that commensal and pathogenic bacteria or bacterial DNAs may differentially affect the expression of IL-6 and IL-8 and the related TLR signaling pathway in HOKs. (Supported by RGC/HKU766909M and HKU/Seed Funding/201007159003).
DescriptionPoster Discussion Session: 16. Senior Researcher Division Travel Award: paper no. 81
Persistent Identifierhttp://hdl.handle.net/10722/143827

 

DC FieldValueLanguage
dc.contributor.authorLi, Hen_US
dc.contributor.authorSeneviratne, Cen_US
dc.contributor.authorLau, ASYen_US
dc.contributor.authorJin, Len_US
dc.date.accessioned2011-12-21T08:56:55Z-
dc.date.available2011-12-21T08:56:55Z-
dc.date.issued2011en_US
dc.identifier.citationThe 25th Annual Scientific Meeting of the IADR-SEA Division and the 22nd Annual Meeting of SEAADE, Singapore, 28-30 October 2011.en_US
dc.identifier.urihttp://hdl.handle.net/10722/143827-
dc.descriptionPoster Discussion Session: 16. Senior Researcher Division Travel Award: paper no. 81-
dc.description.abstractOBJECTIVES: Periodontal disease is initiated by a microbial shift from commensal plaque biofilm to pathogenic one which results in destructive inflammatory response. Hitherto only sparse data are available on the molecular mechanisms which govern the harmonious bacteria-host interaction in healthy status and regulate the microbial shift concerned. This preliminary study aimed to investigate the molecular mechanisms by which commensal and periodontopathic bacteria communicate with human oral keratinocytes (HOKs), and to determine the effects of bacterial DNA on the cytokine expression in HOKs. METHODS: Commensal bacteria Streptococcus mutans (Sm), Actinomyces israelii (Ai) and periodontopathic bacteria Actinomyces actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg) were used in the study. Sm and Aa as well as the purified DNAs of Sm, Ai, Aa and Pg were co-cultured with HOKs respectively. IL-6, IL-8 and TNF-alpha were analyzed by ELISA. The effects of Aa- and Pg DNA on the expression of Toll-like receptors (TLRs) related signal transduction pathways in HOKs were examined by western blots, qPCR and PCR array. RESULTS: Sm and Aa up-regulated the expression of IL-6 and IL-8 in HOKs through different signaling pathways. Aa induced p65 MAPK pathway after 30 min co-culture with HOKs. The DNAs of Sm, Ai, Aa and Pg enhanced the expression of IL-6 and IL-8 in HOKs. Pg DNA activated TLR signaling pathway. CONCLUSION: This study suggests that commensal and pathogenic bacteria or bacterial DNAs may differentially affect the expression of IL-6 and IL-8 and the related TLR signaling pathway in HOKs. (Supported by RGC/HKU766909M and HKU/Seed Funding/201007159003).-
dc.languageengen_US
dc.publisherThe International Association for Dental Research.-
dc.relation.ispartofIADR/SEAADE Annual Scientific Meeting, 2011en_US
dc.subjectCytokine-
dc.subjectHost-microbial interactions-
dc.subjectImmunology-
dc.subjectPeriodontal disease-
dc.subjectPeriodontics-
dc.titleCrosstalk of human oral keratinocytes with commensal and pathogenic bacteriaen_US
dc.typeConference_Paperen_US
dc.identifier.emailLi, H: tracylhj@hku.hken_US
dc.identifier.emailSeneviratne, C: jaya@hku.hken_US
dc.identifier.emailJin, L: ljjin@hkucc.hku.hk-
dc.identifier.authoritySeneviratne, C=rp01372en_US
dc.identifier.authorityJin, L=rp00028en_US
dc.description.naturelink_to_OA_fulltext-
dc.identifier.hkuros197880en_US
dc.publisher.placeUnited States-
dc.description.otherThe 25th Annual Scientific Meeting of the IADR-SEA Division and the 22nd Annual Meeting of SEAADE, Singapore, 28-30 October 2011.-

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