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. 1991 Oct;59(10):3760–3767. doi: 10.1128/iai.59.10.3760-3767.1991

Differential killing of Actinobacillus actinomycetemcomitans and Capnocytophaga spp. by human neutrophil granule components.

K T Miyasaki 1, A L Bodeau 1, T F Flemmig 1
PMCID: PMC258948  PMID: 1894375

Abstract

The purpose of this study was to determine whether granule fractions of human neutrophils differentially kill Actinobacillus actinomycetemcomitans and Capnocytophaga spp. Granule extracts were subjected to gel filtration, and seven fractions (designated A through G) were obtained. Under aerobic conditions at pH 7.0, representative strains of A. actinomycetemcomitans were killed by fraction D and variably by fraction B. In contrast, the Capnocytophaga spp. were killed by fractions C, D, F, and G. Fractions A (containing lactoferrin and myeloperoxidase) and E (containing lysozyme) exerted little bactericidal activity under these conditions. Anaerobiosis had little effect on the bactericidal activity of fractions D and F but inhibited that of fractions B and C. Electrophoresis, zymography, determination of amino acid composition, and N-terminal sequence analysis revealed that fraction C contained elastase, proteinase 3, and azurocidin. Fraction D contained lysozyme, elastase, and cathepsin G. Subfractions of C and D containing elastase (subfraction C4), a mixture of elastase and azurocidin (subfraction C5), and cathepsin G (subfraction D9) were found to be bactericidal. The bactericidal effects of fraction D and subfraction D9 against A. actinomycetemcomitans was not inhibited by heat inactivation, phenylmethylsulfonyl fluoride, or N-benzyloxycarbonylglycylleucylphenylalanylchloromethyl ketone. We conclude that (i) A. actinomycetemcomitans and Capnocytophaga spp. were sensitive to the bactericidal effects of different neutrophil granule components, (ii) both were sensitive to the bactericidal effects of neutral serine proteases, and (iii) the killing of A. actinomycetemcomitans by cathepsin G-containing fractions was independent of oxygen and neutral serine protease activity.

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Selected References

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