Alendronate augments interleukin-1b release from macrophages infected with periodontal pathogenic bacteria through activation of caspase-1

Nitrogen-containing bisphosphonates (NBPs) are anti-bone-resorptive drugs with inflammatory side effects that include osteomyelitis and osteonecrosis of the jaw. Oral bacteria have been considered to be a trigger for these NBP-associated jaw bone diseases. The present study examined the effects of a...

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Veröffentlicht in:Toxicology and applied pharmacology 2009-02, Vol.235 (1), p.97-104
Hauptverfasser: Deng, X, Tamai, R, Endo, Y, Kiyoura, Y
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Sprache:eng
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Zusammenfassung:Nitrogen-containing bisphosphonates (NBPs) are anti-bone-resorptive drugs with inflammatory side effects that include osteomyelitis and osteonecrosis of the jaw. Oral bacteria have been considered to be a trigger for these NBP-associated jaw bone diseases. The present study examined the effects of alendronate (a typical NBP) and clodronate (a non-NBP) on the production of proinflammatory cytokines by macrophages infected with Porphyromonas gingivalis and Tannerella forsythia, which are important pathogens of periodontal diseases. Pretreatment with alendronate augmented IL-1b, but not TNFa, production by macrophages infected with P. gingivalis or T. forsythia. This augmentation of IL-1b production was inhibited by clodronate. Furthermore, caspase-1, a promoter of IL-1b production, was activated by treatment with alendronate, and caspase-1 inhibitor reduced the production of IL-1b induced by alendronate and P. gingivalis. These results suggest that NBPs augment periodontal pathogenic bacteria-induced IL-1b release via caspase-1 activation, and this phenomenon may contribute to the development of NBP-associated inflammatory side effects including jaw osteomyelitis. Co-treatment with clodronate may prevent and/or reduce these inflammatory effects induced by NBPs.
ISSN:0041-008X
DOI:10.1016/j.taap.2008.11.005