S100A8 and S100A9 inhibit neutrophil oxidative metabolism in-vitro: Involvement of adenosine metabolites

Abstract Neutrophils are short-lived granulocytic cells of the innate immune system specialized in the production of reactive oxygen species. S100A8 and S100A9 and their heterocomplex calprotectin play a role in neutrophil recruitment and represent 40% of neutrophil cytosolic protein weight. The pre...

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Bibliographic Details
Published in:Free radical research 2010-04, Vol.44 (4), p.389-396
Main Authors: Sroussi, Herve Y., Lu, Yu, Zhang, Qin L., Villines, Dana, Marucha, Phillip T.
Format: Article
Language:English
Subjects:
adenosine
Adenosine - metabolism
Adenosine Deaminase - metabolism
Calgranulin A - metabolism
Calgranulin B - metabolism
calprotectin
DCFH-DA
Enzyme Activation
Enzyme Activators - pharmacology
Enzyme Inhibitors - pharmacology
Fluoresceins - metabolism
Fluorescent Dyes - metabolism
Humans
Neutrophil
Neutrophil Activation - drug effects
Neutrophils - drug effects
Neutrophils - metabolism
Oxidation-Reduction
Protein Kinase C - antagonists & inhibitors
Protein Kinase C - metabolism
Purinergic P1 Receptor Antagonists
Reactive Oxygen Species - metabolism
Receptors, Purinergic P1 - metabolism
Recombinant Proteins - metabolism
ROS
S100A8
S100A9
Time Factors
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Summary:Abstract Neutrophils are short-lived granulocytic cells of the innate immune system specialized in the production of reactive oxygen species. S100A8 and S100A9 and their heterocomplex calprotectin play a role in neutrophil recruitment and represent 40% of neutrophil cytosolic protein weight. The present study was designed to test the effect of S100A8 and S100A9 on the rate of neutrophil oxidative metabolism. It is hypothesized that the two S100 proteins inhibit neutrophil associated oxidation. Granulocytes freshly isolated from healthy volunteers were tested for their ability to oxidize dichlorofluorescindiacetate (DCFH-DA) in-vitro. The data showed that S100A8 and S100A9 inhibited spontaneous and stimulated oxidation of the DCFH-DA probe by neutrophils. The inhibition of neutrophil oxidative metabolism by S100A8 and S100A9 was markedly reduced by the enzymatic activity of adenosine deaminase. Inhibitors of the P1 adenosine receptors also reduced the anti-oxidative effect of S100A8/A9 providing further support for the involvement of adenosine metabolites in S100A8/ A9 anti-oxidative effect.
ISSN:1071-5762
1029-2470
DOI:10.3109/10715760903431434