IL-33 Exacerbates Periodontal Disease through Induction of RANKL

Cytokines mediate the balance between protective and destructive immunity in periodontitis. We sought to investigate the role of IL-33 in periodontitis. The expression of IL-33 in gingival tissue from healthy controls ( n = 10) and patients with chronic periodontitis ( n = 17) was investigated. Based on a murine model of periodontal disease, the function of IL-33 was determined first by administration of exogenous IL-33 and second by inhibition of IL-33 signaling using mice deficient in the IL-33 receptor ST2. Alveolar bone level, serum antibody, and lymphocyte responses were assessed in the murine model. Expression of IL-33 and ST2 was elevated in gingival tissues from patients with chronic periodontitis as compared with healthy tissues ( P < 0.05). Similarly, Il33 expression was higher in periodontal tissues of Porphyromonas gingivalis–infected mice as compared with sham-infected controls ( P < 0.05). IL-33 treatment of P. gingivalis–infected mice significantly exacerbated alveolar bone loss when compared with infection or IL-33 treatment alone ( P < 0.001). Conversely, P. gingivalis infection–induced alveolar bone loss was attenuated in mice lacking ST2. The percentages of T and B lymphocytes expressing nuclear factor κB ligand (RANKL) in the gingival tissues and T lymphocytes expressing RANKL in the cervical draining lymph nodes were higher in IL-33-treated P. gingivalis–infected mice versus phosphate buffered saline–treated P. gingivalis–infected controls (all P < 0.001). Targeting the RANKL pathway by osteoprotegerin administration abrogated periodontal bone destruction in P. gingivalis–infected, IL-33-treated mice. These data demonstrate a previously unrecognized role for IL-33 in exacerbating bone loss in a RANKL-dependent manner in the context of bacterial infection and suggest that this pathway may be amenable to manipulation as a novel therapeutic target in periodontitis.