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Differences in the expression of CD64 and mCD14 on polymorphonuclear cells and on monocytes in patients with septic
E Barth1, G Fischer, E M Schneider
1Department of Anaesthesiology, Universitaetsklinikum, Steinhoevelstr. 9, Ulm, 89075, Germany. eberhard.barth@medizin.uni-ulm.de
Abstract:
The present study was performed to clarify the time course of the expression of CD64, the Fc gamma receptor type I (FcgammaR1), and membrane-bound CD14 (mCD14), one of the major receptors for endotoxin, on polymorphonuclear leukocytes (PMN) and monocytes in 22 postoperative/post-traumatic patients with septic shock. Therefore, the expression of CD64 and mCD14, and serum concentrations of granulocyte colony-stimulating factor (G-CSF) and interferon-gamma (IFN-gamma) were determined by flow cytometric analysis and enzyme-linked immunosorbent assay (ELISA), respectively, from the first day of septic shock onwards over a period of 14 days. When compared to the values of 12 healthy controls, CD64 expression was elevated significantly on PMN and monocytes of the patients, whereas the expression of mCD14 was decreased significantly at all days. The initially increased expression of CD64 on PMN and monocytes decreased within the first days of septic shock. The already initially decreased mCD14 expression decreased further on PMN, but not on monocytes. Serum concentrations of G-CSF and IFN-gamma during the study period were significantly higher than those of the control group. The differences in the kinetics of CD64 and mCD14 expression in patients with septic shock may be explained by different regulatory effects of cytokines, such as G-CSF and IFN-gamma.
Insights
Septic shock alters immune cell receptors: CD64 (Fc gamma receptor type I) increased on neutrophils and monocytes, while mCD14 (membrane-bound CD14) decreased. Cytokine levels like G-CSF and IFN-gamma were also elevated.
Area of Science:
- Immunology
- Critical Care Medicine
- Molecular Biology
Background:
- Septic shock is a life-threatening condition characterized by dysregulated immune responses.
- Polymorphonuclear leukocytes (PMN) and monocytes play crucial roles in the innate immune response to infection.
- CD64 and membrane-bound CD14 (mCD14) are key receptors involved in pathogen recognition and immune cell activation.
Purpose of the Study:
- To investigate the temporal expression patterns of CD64 and mCD14 on PMN and monocytes in patients with septic shock.
- To correlate these receptor expression changes with serum levels of granulocyte colony-stimulating factor (G-CSF) and interferon-gamma (IFN-gamma).
Main Methods:
- Flow cytometry was used to quantify CD64 and mCD14 expression on PMN and monocytes.
- Enzyme-linked immunosorbent assay (ELISA) measured serum concentrations of G-CSF and IFN-gamma.
- Data were collected over 14 days from 22 septic shock patients and compared to 12 healthy controls.
Main Results:
- CD64 expression was significantly elevated on PMN and monocytes in septic shock patients compared to controls.
- mCD14 expression was significantly decreased on PMN and monocytes throughout the study period.
- Initially increased CD64 expression on PMN and monocytes decreased within the first few days.
- mCD14 expression further decreased on PMN but remained low on monocytes.
- Serum G-CSF and IFN-gamma levels were significantly higher in patients than in controls.
Conclusions:
- The dynamic changes in CD64 and mCD14 expression reflect the complex immune response during septic shock.
- Differential regulation of these receptors may be influenced by elevated cytokine levels, such as G-CSF and IFN-gamma.