title: Endotoxin stimulated interleukin-10 production is enhanced by adenosine. Possible key to septic shock associated immune deficiency?
abstract: The aim of this bench study was to investigate whether adenosine influences secretion of interleukin-10 (IL-O) in human whole blood culture stimulated with lipopolysaccharide. Whole blood from healthy human volunteers was mixed ex vivo in 1:1 ratio with RPMI 1640 culture medium and subsequently cultured at 37 degrees C with or without adenosine (total of 120 microM added in four aliquots over two hours) in the presence or absence of 100 ng/ml lipopolysaccharide for four and eight hours, respectively. There was only a minimal IL-10 production after four hours of culture regardless of the experimental conditions. However, lipopolysaccharide stimulated whole blood cultures with added adenosine released large amounts of IL-lO after eight hours. The response was similar whether adenosine was added before (5.99 pg/ml/10(6) leucocytes) or after (10.35 microg/ml/10(6) leucocytes) stimulation with lipopolysaccharide and interindividual variation was present. In conclusion adenosine enhances lipopolysaccharide stimulated IL-10 production in whole human blood and may contribute to the IL-10 mediated immune dysfunction in sepsis.
authors.affiliation: Department of Intensive Care Medicine, University of Sydney, Nepean Hospital, Penrith, New South Wales, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Nalos
authors.forename: S J
authors.initials: SJ
authors.lastname: Huang
authors.forename: R
authors.initials: R
authors.lastname: Pandit
authors.forename: A S
authors.initials: AS
authors.lastname: McLean
mesh_terms: D000241:Adenosine / Q000494:pharmacology*; D006801:Humans; D016753:Interleukin-10 / Q000096:biosynthesis*; D007962:Leukocytes / Q000187:drug effects / Q000276:immunology; D008070:Lipopolysaccharides / Q000494:pharmacology; D012772:Shock, Septic / Q000097:blood / Q000276:immunology*; D018709:Statistics, Nonparametric; D013997:Time Factors
chemical_list: D008070:Lipopolysaccharides; D016753:Interleukin-10; D000241:Adenosine