Affiliation:
1. Department of Infectious Diseases, University Hospital Leiden, Leiden, The Netherlands
Abstract
The study of the phagocytosis and intracellular killing of
Candida albicans
by granulocytes and monocytes has been hampered by the budding and pseudomycelium formation of this yeast during a relatively short incubation period at 37°C and by the similar density of candida cells and phagocytes, which makes differential centrifugation impossible. In the present study,
C. albicans
was used after 5 days of preculture at 30°C, after which the number of candida cells remained constant during incubation at 37°C for 90 min. On this basis, phagocytosis and intracellular killing were limited to a period of 60 min. Phagocytosis of
C. albicans
by granulocytes and monocytes was measured with a hemocytometer, the number of extracellular candida being a measure of the ingestion of these microorganisms. After 60 min, 96% of the candida cells were ingested by normal human granulocytes and monocytes. This process was dependent on the opsonin concentration and temperature and was inhibited by mono-iodoacetic acid. Heat-inactivated serum was less active than fresh serum, reflecting the role of complement factors with respect to opsonization. Intracellular killing was measured by a microbiological assay. After 60 min of incubation of phagocytes together with
C. albicans
and serum, human granulocytes and monocytes killed 58 and 50% of the ingested candida, respectively. This process was inhibited by phenylbutazone. Phagocytes from patients with chronic granulomatous disease showed impaired intracellular killing.
Publisher
American Society for Microbiology
Subject
Infectious Diseases,Immunology,Microbiology,Parasitology
Reference10 articles.
1. Separation of leucocytes from blood and bone marrow;Boyum A.;Scand. J. Clin. Lab. Invest. Suppl.,1968
2. Human serum interactions with Candida albicans;Chilgren R. A.;J. Immunol.,1968
3. Karnovsky M. L. S. Simmons E. A. Glass A. W. Shafer and P. D'Arcy Hart. 1970. Metabolism of macrophages p. 103-120. In R. van Furth (ed.) Mononuclear phagocytes. J. B. Lippincott Co. New York.
4. Effects of hyperosmolality on candidacidal activity of human neutrophil polymorphonuclear leukocytes and on clumping ofCandida albicans by human serum;Kernbaum S.;Biomedicine,1976
5. Measurement of candidacidal activity of specific leukocyte types in mixed cell populations. I. Normal, myeloperoxidase-deficient, and chronic granulomatous disease neutrophils;Lehrer R. I.;Infect. Immun.,1970
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