Role of hemolytic and nonhemolytic phospholipase C from Pseudomonas aeruginosa for inflammatory mediator release from human granulocytes.

Abstract:

BACKGROUND:Pseudomonas aeruginosa phospholipase C (PLC) is a critical component in the pathogenesis of severe P. aeruginosa infections. However, P. aeruginosa can produce a hemolytic (PLC-H) as well as a nonhemolytic (PLC-N) variant, both having a MW of about 77 kD. In the past, studies did not distinguish between both types of PLC with regard to the induction of inflammatory mediators from human cells. METHODS:We compared the ability of P. aeruginosa PLC-H and PLC-N to generate leukotriene B4 (by HPLC) and oxygen (O2-) metabolites (luminol-enhanced chemiluminescence), and to release beta-glucuronidase and histamine (fluorophotometry from human granulocytes. Therefore, human neutrophilic granulocytes (PMN; 1 x 10(7)) or human peripheral blood mononuclear cells (5 x 10(6)) were treated with purified P. aeruginosa PLC-H (up to 10 units) as well as culture supernatants (cutoff: MW > 50,000) of P. aeruginosa PAOl capable of producing both PLC-H and PLC-N, and PAOl mutant strains deficient in the production of either or both phospholipases. Controls were PLC-H from Clostridium perfringens and PLC-N from Bacillus cereus. RESULTS:PLC-H-containing P. aeruginosa culture supernatant, purified P. aeruginosa PLC-H as well as PLC-H from P. perfringens activated human leukocytes for a significant (p < 0.05) increase in inflammatory mediator release. In this regard, purified PLC-H (10 units) from P. aeruginosa activated human PMN for a significant increase in the generation of oxygen metabolites (30 +/- 5.4 x 10(3) cpm) and in leukotriene B4 (6.1 +/- 2.0 ng), in the release of beta-glucuronidase (15.8 +/- 1.1%) and of histamine (25.8 +/- 6.2%) as compared to the corresponding control values (3 +/- 1 x 10(3) cpm; 0.2 +/- 0.1 ng; 5.1 +/- 1.0%, 5.1 +/- 1.5%). Culture supernatants containing no PLC or only PLC-N, as well as PLC-N from B. cereus, failed to activate or only slightly stimulated human granulocytes for inflammatory mediator release. CONCLUSION:The data thus provide evidence that P. aeruginosa PLC-H can be a potent inducer of inflammatory mediator release, at least in vitro. Our results therefore contribute to the understanding of the pathophysiological role of P. aeruginosa PLCs.

authors

König B,Vasil ML,König W

doi

10.1159/000237441

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

115-24

issue

2

eissn

1018-2438

issn

1423-0097

journal_volume

112

pub_type

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