Roles of group IIA phospholipase A2 and complement in killing of bacteria by acute phase serum.

Abstract:

:The complement system is regarded as an important component of the innate defence system against invading bacteria. However, synergistic actions between the complement and the other components of innate immunity are incompletely known. Human group IIA phospholipase A(2) (hGIIA PLA(2)) is an effective antibacterial enzyme in serum of patients with severe bacterial infections. Our aim was to investigate the significance of complement and hGIIA PLA(2) in acute phase serum. Serum samples were collected from patients with acute bacterial infections and from healthy control subjects. We prepared hGIIA PLA(2)-depleted serum by immunoadsorption and inhibited the activity of complement by a specific inhibitor, compstatin. The bactericidal effects of treated and untreated serum were compared by incubating Staphylococcus aureus and Listeria monocytogenes in the presence of serum. Acute phase serum effectively killed S. aureus and L. monocytogenes, and depletion of hGIIA PLA(2) significantly reduced the antibacterial effect. Complement had a weak bactericidal effect against L. monocytogenes. We conclude that hGIIA PLA(2) is the major antibacterial factor in human acute phase serum against the gram-positive bacteria S. aureus and L. monocytogenes, exceeding complement in efficiency.

journal_name

Scand J Immunol

authors

Grönroos JO,Salonen JH,Viander M,Nevalainen TJ,Laine VJ

doi

10.1111/j.1365-3083.2005.01678.x

keywords:

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

413-9

issue

4

eissn

0300-9475

issn

1365-3083

pii

SJI1678

journal_volume

62

pub_type

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