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Spirochetes, including Treponema denticola, are implicated in the pathogenesis of periodontal disease. Because T. denticola lacks lipopolysaccharides that serve as targets for human beta-defensin (h beta D) binding, we postulated that T. denticola would resist killing by h beta D. We showed that T. denticola is resistant to h beta D-1 and -2. Protease inhibitors did not enhance killing of T. denticola by h beta D-2, suggesting that degradation of h beta D-2 by treponemal proteases is not a major factor in T. denticola resistance.
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Brissette et al. (2002) studied this question.
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