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Fractalkine in human inflammatory cardiomyopathy
1Department of Cardiology and Pneumonology, Charité University Medicine Berlin, Campus Benjamin Franklin, Berlin, Germany.
Heart (British Cardiac Society)
|March 2, 2011
Summary
Fractalkine (CX3CL1) is upregulated in inflammatory cardiomyopathy (CMi), increasing peripheral blood mononuclear cell (PBMC) activity and potentially causing direct cardiac depression. This highlights CX3CL1/CX3CR1 system
Area of Science:
- Cardiovascular Research
- Immunology
- Molecular Biology
Background:
- Cardiac inflammation significantly impacts the prognosis of inflammatory cardiomyopathy (CMi).
- The precise mechanisms driving cardiac inflammation in CMi remain incompletely understood.
Purpose of the Study:
- To investigate the role of fractalkine (CX3CL1) in the chemotactic and adhesive functions of peripheral blood mononuclear cells (PBMCs) from CMi patients.
- To explore the impact of CX3CL1 on cardiac function in the context of CMi.
Main Methods:
- Analysis of fractalkine (CX3CL1) and monocyte chemoattractant protein-1 (MCP-1) expression in endomyocardial biopsies (EMBs) from CMi patients (enterovirus-positive, virus-negative, parvovirus B19-positive) and controls.
- Assessment of CX3CR1-mediated chemotaxis and MCP-1 secretion in peripheral blood mononuclear cells (PBMCs).
- Evaluation of the effect of CX3CL1 on neonatal rat cardiomyocytes' response to beta-adrenergic stimulation.
Main Results:
- CX3CL1 and MCP-1 expression were significantly elevated in EMBs of EV-positive and virus-negative CMi patients compared to controls and B19-positive patients.
- CX3CR1-mediated chemotaxis of PBMCs was twofold higher in CMi patients versus controls.
- MCP-1 secretion was significantly increased in PBMCs from EV-positive CMi patients, further enhanced by CX3CL1, and CX3CL1 directly attenuated the chronotropic response of cardiomyocytes.
Conclusions:
- The cardiac and plasma CX3CL1/CX3CR1 system is upregulated in CMi, influencing PBMC functional potential.
- CX3CL1 exhibits a direct cardiodepressive effect, attenuating the response of cardiomyocytes to beta-adrenergic stimulation.
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