Citations to this article

In vitro killing of oral Capnocytophaga by granule fractions of human neutrophils is associated with cathepsin G activity.
K T Miyasaki, A L Bodeau
K T Miyasaki, A L Bodeau
Published May 1, 1991
Citation Information: J Clin Invest. 1991;87(5):1585-1593. https://doi.org/10.1172/JCI115172.
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Research Article

In vitro killing of oral Capnocytophaga by granule fractions of human neutrophils is associated with cathepsin G activity.

Abstract

The Capnocytophaga are inhabitants of the hypoxic human gingival crevice that are normally prevented by neutrophils from causing periodontal and systemic infection. To identify potential nonoxidative bactericidal mechanisms against Capnocytophaga within human neutrophils, gel filtration chromatography was used to fractionate neutrophil granule extracts. Seven granule fractions, designated A through G, were obtained. The Capnocytophaga were most sensitive to killing by fraction D. Fraction D exhibited substantial bactericidal activity under aerobic and anaerobic conditions. The bactericidal activity associated with ion-exchange subfractions D8-D11, which contained primarily cathepsin G as assessed by enzymatic activity, amino acid composition, and NH2-terminal sequence. Heat-inactivation, diisopropylfluorophosphate, PMSF, and N-benzyloxycarbonylglycylleucylphenylalanyl-chloromethyl ketone inhibited bactericidal activity against Capnocytophaga sputigena but not Escherichia coli. We conclude that (a) human neutrophil cathepsin G is an important antimicrobial system against the Capnocytophaga, (b) the bactericidal activity of cathepsin G against Capnocytophaga is oxygen independent, and (c) an intact enzyme active site is involved in the killing of C. sputigena but not E. coli. We suggest that human neutrophil cathepsin G is an important antimicrobial system against certain oral bacteria and that cathepsin G kills bacteria by two distinct mechanisms.

Authors

K T Miyasaki, A L Bodeau

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Citations to this article (24)

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