title: Depressed responsiveness of peripheral blood mononuclear cells to heat-shock proteins in periodontitis patients.
abstract: The extensive homology between human and bacterial heat shock proteins (HSPs) may play a role in autoimmune reactions in periodontitis. Thus, we questioned whether peripheral blood mononuclear cell (PBMC) proliferative responses to HSPs are different between periodontitis patients and control subjects with gingivitis. The proliferative responses of PBMCs of patients (n = 10) and controls (n = 12) to recombinant mycobacterial HSP60 (MycHSP60) and HSP70 (MycHSP70), as well as recombinant human HSP60 (HumHSP60) and HSP70 (HumHSP70), were investigated. In addition, the proliferative responses to Candida albicans and purified protein derivatives of Mycobacterium (PPD) were included. Mean responses to HumHSP60, MycHSP60, and HumHSP70 were significantly lower for patients compared with controls. The responses to MycHSP70 showed a similar trend. However, when Candida and PPD were used as antigens, there was no difference in responses of the PBMCs between the periodontitis patients and controls. The level of IFN-gamma in the supernatants of the cells stimulated with HSPs was lower in the patients compared with controls. This concurs with the current hypothesis that periodontitis patients have a depressed Th1 response. Furthermore, we found that with an increasing estimated subgingival bacterial load, periodontitis patients mount a decreasing immune response to HSPs, while the controls showed a positive correlation between these two parameters. From these findings, we speculate that poor reactivity to HSPs may be a susceptibility factor for destructive periodontal disease and may need to be considered in the pathogenesis of this condition.
authors.affiliation: Academic Centre for Dentistry Amsterdam (ACTA), Department of Periodontology, The Netherlands.
authors.forename: M D
authors.initials: MD
authors.lastname: Petit
authors.forename: A
authors.initials: A
authors.lastname: Wassenaar
authors.forename: U
authors.initials: U
authors.lastname: van der Velden
authors.forename: W
authors.initials: W
authors.lastname: van Eden
authors.forename: B G
authors.initials: BG
authors.lastname: Loos
mesh_terms: D000328:Adult; D000946:Antigens, Fungal / Q000494:pharmacology; D015551:Autoimmunity / Q000276:immunology; D002176:Candida albicans / Q000276:immunology; D002455:Cell Division / Q000187:drug effects; D018834:Chaperonin 60 / Q000494:pharmacology; D005260:Female; D005891:Gingivitis / Q000097:blood / Q000276:immunology; D018840:HSP70 Heat-Shock Proteins / Q000494:pharmacology; D006360:Heat-Shock Proteins / Q000494:pharmacology*; D006801:Humans; D007371:Interferon-gamma / Q000032:analysis / Q000187:drug effects; D015847:Interleukin-4 / Q000032:analysis; D007963:Leukocytes, Mononuclear / Q000187:drug effects* / Q000276:immunology; D008297:Male; D009163:Mycobacterium bovis / Q000276:immunology; D009169:Mycobacterium tuberculosis / Q000276:immunology; D010518:Periodontitis / Q000097:blood* / Q000276:immunology; D011994:Recombinant Proteins; D018417:Th1 Cells / Q000187:drug effects / Q000276:immunology; D014373:Tuberculin / Q000494:pharmacology
chemical_list: D000946:Antigens, Fungal; D018834:Chaperonin 60; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D011994:Recombinant Proteins; D014373:Tuberculin; D015847:Interleukin-4; D007371:Interferon-gamma