Faculty Research 1990 - 1999

Title

CD4(+) T cells and the proinflammatory cytokines gamma interferon and interleukin-6 contribute to alveolar bone loss in mice.

Document Type

Article

Publication Date

1999

Keywords

Alveolar-Bone-Loss: im, Animal, Bacteroidaceae-Infections: im, pa, CD4-Positive-T-Lymphocytes: im, CD8-Positive-T-Lymphocytes: im, Disease-Models-Animal, Human, Interferon-Type-II: im, Interleukin-6: im, Killer-Cells-Natural: im, Mice, Mice-Inbred-BALB-C, Mice-Inbred-C57BL, Mice-Knockout, Mice-SCID, Porphyromonas-gingivalis: im, SUPPORT-NON-U-S-GOVT, SUPPORT-U-S-GOVT-P-H-S

JAX Source

Infect Immun 1999 Jun;67(6):2804-9

Grant

R29DE10728/DE/NIDR, R01AI24544/AI/NIAID

Abstract

In this study, we used a mouse model to examine the role of the adaptive immune response in alveolar bone loss induced by oral infection with the human gram-negative anaerobic bacterium Porphyromonas gingivalis. Severe combined immunodeficient mice, which lack B and T lymphocytes, exhibited considerably less bone loss than did immunocompetent mice after oral infection, suggesting that lymphocytes contribute to this process. Bone loss after oral infection was decreased in mice deficient in major histocompatibility complex (MHC) class II-responsive CD4(+) T cells, but no change in bone loss was observed in mice deficient in MHC class I-responsive CD8(+) T cells or NK1(+) T cells. Mice lacking the cytokine gamma interferon or interleukin-6 also demonstrated decreased bone loss. These results suggest that the adaptive immune response, and in particular CD4(+) T cells and the proinflammatory cytokines that they secrete, are important effectors of bone loss consequent to P. gingivalis oral infection. The studies also reinforce the utility of the mouse oral infection model in dissecting the pathobiology of periodontal disease.