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 Immunoljournal_title
Scandinavian journal of immunologyauthors
Grönroos JO,Salonen JH,Viander M,Nevalainen TJ,Laine VJdoi
10.1111/j.1365-3083.2005.01678.xkeywords:
subject
Has Abstractpub_date
2005-10-01 00:00:00pages
413-9issue
4eissn
0300-9475issn
1365-3083pii
SJI1678journal_volume
62pub_type
杂志文章abstract::Peripheral CD4 T-cell depletion has been observed in human immunodeficiency virus (HIV)-negative patients with pulmonary tuberculosis (TB). To investigate more accurately this alteration, we studied peripheral blood CD45RA(+) and CD29(high) CD4 subsets in 79 TB patients with (HIV(+)TB(+)) or without (HIV(-)TB(+)) HIV ...
journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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