Abstract
Periodontal diseases are infections of the tissues supporting the dentition. Recognition that relatively specific microfloras are associated with distinct clinical forms of periodontal disease has prompted the use of antimicrobial agents as adjuncts in periodontal therapy. Clindamycin is one of several antibiotics known to concentrate in bioactive form in neutrophils and to potentiate phagocyte bactericidal activity against certain bacteria. Neutrophils appear to play a key role in host defense against periodontopathic gram-negative bacteria. In the present study, we evaluated the effect of preincubation of neutrophils with therapeutically achievable concentrations of clindamycin upon subsequent in vitro bactericidal activity against three species of gram-negative periodontal bacteria, including Actinobacillus actinomycetemcomitans, Eikenella corrodens, and Capnocytophaga ochracea. In each instance, clindamycin neither enhanced nor inhibited the kinetics of bactericidal activity at low bacterium-neutrophil multiplicities. Further, this antibiotic had no demonstrable effect upon neutrophil bactericidal capacity, as assessed at bacterium-neutrophil ratios as high as 50:1. Our results indicate that clindamycin does not potentiate neutrophil bactericidal activity against the species of gram-negative periodontal organisms tested.
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