title: Role of helper T cells in the humoral immune responses against 53-kDa outer membrane protein from Porphyromonas gingivalis.
abstract: Outer membrane protein with a 53-kDa molecular weight (Ag53) isolated from Porphyromonas gingivalis evokes strong humoral immune responses in many periodontitis patients. To examine the effects of cytokines produced by Ag53-specific Th cells on the IgG production against Ag53, we established Ag53-specific Th-cell lines from patients with early onset periodontitis and from healthy volunteers. We then developed a mixed lymphocyte culture system between Ag53-specific Th cells and auto- or allo-derived T-cell-depleted leukocytes produced from the subjects whose HLA class II haplotypes were completely matched. Interferon-gamma production was observed in all Th cell lines from patients and healthy subjects. As for Th2 type cytokines, interleukin (IL)-4, IL-5, IL-6 and IL-10 production varied greatly in Th cells regardless of the periodontal condition of the donor. Only Th cell lines with a high Th2/Th1 ratio induced Ag53-specific IgG production when cocultured with T-cell-depleted leukocytes. Thus, the difference in Th2/Th1 balance may regulate the Ag53-specific IgG production.
authors.affiliation: Department of Patho-physiology/Periodontal Science, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kato
authors.forename: H
authors.initials: H
authors.lastname: Ohyama
authors.forename: F
authors.initials: F
authors.lastname: Nishimura
authors.forename: S
authors.initials: S
authors.lastname: Matsushita
authors.forename: S
authors.initials: S
authors.lastname: Takashiba
authors.forename: Y
authors.initials: Y
authors.lastname: Murayama
mesh_terms: D010520:Aggressive Periodontitis / Q000276:immunology*; D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D002460:Cell Line; D018920:Coculture Techniques; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis; D007371:Interferon-gamma / Q000096:biosynthesis; D007378:Interleukins / Q000096:biosynthesis; D016966:Porphyromonas gingivalis / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology* / Q000378:metabolism
chemical_list: C116911:Ag53 protein, Porphyromonas gingivalis; D000907:Antibodies, Bacterial; D001425:Bacterial Outer Membrane Proteins; D007074:Immunoglobulin G; D007378:Interleukins; D007371:Interferon-gamma