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. 1992 May;60(5):1806–1812. doi: 10.1128/iai.60.5.1806-1812.1992

Immunoglobulin G subclass response of localized juvenile periodontitis patients to Actinobacillus actinomycetemcomitans Y4 lipopolysaccharide.

M E Wilson 1, R G Hamilton 1
PMCID: PMC257077  PMID: 1563768

Abstract

Sera from patients with localized juvenile periodontitis (LJP) often contain markedly elevated immunoglobulin G (IgG) antibody titers to serospecific determinants of the lipopolysaccharide (LPS) from Actinobacillus actinomycetemcomitans. The objective of the present study was to define the subclass distribution of the IgG antibody response of LJP patients to this key cell envelope antigen. IgG subclass antibody responses to A. actinomycetemcomitans LPS were quantified in an enzyme-linked immunosorbent assay with human IgG subclass-restricted monoclonal antibodies. Serum antibody concentrations were calculated by heterologous interpolation of a dose-response curve constructed by using human-mouse chimeric antibodies. Sixteen of 17 LJP serum samples tested contained significantly greater concentrations of IgG2 than IgG1 antibodies reactive toward A. actinomycetemcomitans LPS. Geometric mean antibody concentrations of IgG1 and IgG2 were 7.8 and 136.5 micrograms/ml, respectively, among LJP patients with elevated IgG titers to LPS (94% of whom were black). However, both IgG1 and IgG2 antibody concentrations were significantly greater than the corresponding values obtained from sera from LJP patients with low IgG titers to LPS. Among LJP patients with elevated IgG titers to A. actinomycetemcomitans LPS, serum IgG2 concentration and total IgG concentration were also significantly elevated compared with both low-titered LJP sera and sera from periodontally healthy race-matched controls. The results of this study indicate that the humoral response of a predominantly black population of LJP patients to A. actinomycetemcomitans includes the production of LPS-reactive IgG antibodies which are primarily of the IgG2 subclass.

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Selected References

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