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. 1984 Jul;45(1):172–179. doi: 10.1128/iai.45.1.172-179.1984

Effects of an immunomodulating agent on peripheral blood lymphocytes and subgingival microflora in ligature-induced periodontitis.

F Manti, K Kornman, I Goldschneider
PMCID: PMC263296  PMID: 6234232

Abstract

The peripheral blood lymphocyte populations and the subgingival levels of black-pigmented Bacteroides species were monitored during the conversion of chronic gingivitis to progressing periodontitis in cynomolgus monkeys. In addition, the effects of an immunomodulating agent, the pentapeptide of thymopoietin (TP5), were determined. After the induction of active periodontitis, proportions of helper T-cells (OKT-4 positive) decreased from 31.5 to 26.4%, and proportions of B-cells (surface immunoglobulin positive) increased from 44.5 to 51.8%. Proportions of suppressor T-cells (OKT-8 positive) remained unchanged, but the numbers of OKT-8-positive cells increased. During this same time period the total cultivable subgingival flora increased from 1.5 X 10(6) to 3.5 X 10(6) per sample, with Bacteroides gingivalis increasing from 5.3 to 16.6% of the total cultivable subgingival flora. After 10 weeks of active periodontitis, animals were treated with either TP5 or placebo. Treatment with TP5 produced an increase in helper T-cells but had no effect on B-cells. The OKT-4/OKT-8 cell ratio, which decreased from 1.3 to 0.8 with disease induction, was increased to 1.1 after TP5 treatment but remained at 0.9 in placebo-treated animals. TP5 had no effect on the total cultivable subgingival flora but significantly decreased the subgingival proportions of B. gingivalis and other black-pigmented Bacteroides species. In this model system, active periodontitis was associated with an increase in B. gingivalis, a decreased helper/suppressor T-cell ratio, and increased levels of B-cells. Treatment with TP5 increased the helper/suppressor T-cell ratio and decreased B. gingivalis levels, suggesting that lymphocyte subsets have the potential to influence subgingival levels of potential periodontal pathogens.

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Selected References

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