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Provokes Desensitization of Monocytes/Macrophages in Sepsis1
* Department of Cell Biology, University Kaiserslautern, Kaiserslautern, Germany;
Department of Internal Medicine I, Westpfalz-Klinikum Kaiserslautern, Kaiserslautern, Germany;
Department of Virology, Technical University Dresden, Dresden, Germany; and
Institute Biochemistry, Johann-Wolfgang Goethe University, Frankfurt, Germany
Sepsis accounts for the majority of fatal casualties in critically ill patients, because extensive research failed to significantly improve appropriate therapy strategies. Thus, understanding molecular mechanisms initiating the septic phenotype is important. Symptoms of septic disease are often associated with monocyte/macrophage desensitization. In this study, we provide evidence that a desensitized cellular phenotype is characterized by an attenuated oxidative burst. Inhibition of the oxidative burst and depletion of protein kinase C
(PKC) were correlated in septic patients. To prove that PKC down-regulation indeed attenuated the oxidative burst, we set up a cell culture model to mimic desensitized monocytes/macrophages. We show that LPS/IFN-
-treatment of RAW264.7 and U937 cells lowered PKC expression and went on to confirm these data in primary human monocyte-derived macrophages. To establish a role of PKC in cellular desensitization, we overexpressed PKC in RAW264.7 and U937 cells and tested for phorbolester-elicited superoxide formation following LPS/IFN--pretreatment. Inhibition of the oxidative burst, i.e., cellular desensitization, was clearly reversed in cells overexpressing PKC, pointing to PKC as the major transmitter in eliciting the oxidative burst in monocytes/macrophages. However, PKC inactivation by transfecting a catalytically inactive PKC mutant attenuated superoxide formation. We suggest that depletion of PKC in monocytes from septic patients contributes to cellular desensitization, giving rise to clinical symptoms of sepsis.
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