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J Med Microbiol 52 (2003), 303-308; DOI: 10.1099/jmm.0.04974-0
© 2003 Society for General Microbiology
ISSN 0022-2615

HOST REPONSE

Involvement of nitric oxide donor compounds in the bactericidal activity of human neutrophils in vitro

Magdalena Klink1, Maciej Cedzynski1, Anna St Swierzko1, Henryk Tchórzewski12 and Zofia Sulowska1

1Microbiology and Virology Centre, Polish Academy of Sciences, 93-232 Lodz, Lodowa 106, Poland 2Department of Clinical Immunology, Institute of Polish Mothers’ Memorial Hospital, 93-338 Lodz, Rzgowska 281/289, Poland

Correspondence Magdalena Klink mklink{at}cmiwpan.lodz.pl


Received 20 May 2002 Accepted 21 November 2002

The bactericidal activity of human neutrophils against extracellular and facultatively intracellular bacteria was studied in the presence of the nitric oxide (NO) donors sodium nitroprusside (SNP) and 3-morpholinosydnonimine (SIN-1), a molsidomine metabolite. SNP and molsidomine are drugs commonly used as nitrovasodilators in coronary heart disease. It is demonstrated here that the NO donor compounds themselves did not affect the viability and survival of the bacterial strains tested. Neither SNP nor SIN-1 had any effect on the process of bacteria ingestion. In contrast, NO donors enhanced the ability of neutrophils to kill Escherichia coli, Proteus vulgaris and Salmonella Anatum. However, strains differed in their susceptibility to SNP- and SIN-1-mediated killing by neutrophils. Removal of the superoxide anion reduced the bactericidal activity of SNP- and SIN-1-treated neutrophils against E. coli and S. Anatum. This suggests that the NO derivatives formed in the reaction of NO generated from donors with the reactive oxygen species released by phagocytosed neutrophils potentiate the bactericidal activity of human neutrophils in vitro. The above original observation discussed here suggests clinical significance for the treatment of patients with nitrovasodilators in the course of coronary heart disease therapy.

Abbreviations: CL, chemiluminescence; RNI, reactive nitrogen intermediate; ROS, reactive oxygen species; SIN-1, 3-morpholinosydnonimine; SNP, sodium nitroprusside.




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