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The Journal of Medical Microbiology, Vol 25, Issue 2 85-93, Copyright © 1988 by Society for General Microbiology

JOURNAL ARTICLE

Comparison of the opsonic activity of polyclonal and monoclonal antibodies raised against Salmonella minnesota strain R595

N. D. Mehta, B. M. Wilson, N. T. Rapson and C. S. Easmon
Department of Medical Microbiology, Wright-Fleming Institute, St Mary's Hospital Medical School, London.

Murine monoclonal antibodies and immune rabbit serum were raised against the rough mutant Salmonella minnesota strain R595. These antibodies were tested for their opsonic activity against the homologous strain and the smooth wild type S. minnesota by luminol-dependent chemiluminescence and a microscopic assessment of phagocytosis. Immune rabbit serum opsonised both strains. Treatment with normal rabbit serum inhibited the phagocytic uptake of S. minnesota R595. None of the monoclonal antibodies RE01 (anti-KDO), RE12 (anti-KDO) and RE23 (anti-lipid A) were opsonic. Unopsonised S. minnesota R595 stimulated marked chemiluminescence possibly because of its hydrophobic surface, but this was not reflected in increased uptake by phagocytic cells. Results obtained with luminol-dependent chemiluminescence should be interpreted with caution when the opsonisation of rough bacterial strains or those with high surface hydrophobicity is being investigated.


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