© 2008 European Society of Cardiology
Increased expression of LIGHT/TNFSF14 and its receptors in experimental and clinical heart failure
a Research Institute for Internal Medicine, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo Norway
b Department of Cardiology, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo Norway
c Department of Respiratory Medicine, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo Norway
d Institute for Surgical Research, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo Norway
e Department of Thoracic and Cardiovascular Surgery, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo Norway
f Section of Clinical Immunology and Infectious Diseases, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo Norway
* Corresponding author. Research Institute for Internal Medicine, Rikshospitalet-Radiumhospitalet Medical Centre, N-0027 Oslo, Norway. Tel.: +47 23072786; fax: +47 23073630. E-mail address: c.p.dahl{at}medisin.uio.no (C.P. Dahl).
| Abstract |
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Background: Clinical and experimental studies suggest a pathogenic role for inflammation in chronic heart failure (HF). LIGHT is a member of the tumour necrosis factor superfamily involved in innate and adaptive immune responses.
Aims: We sought to investigate a potential pathogenic role of LIGHT in chronic HF.
Methods: We used various clinical and experimental approaches including studies in post-infarction HF rats and in vitro studies of endothelial cells and peripheral blood mononuclear cells (PBMC).
Results: Our main findings were: (i) LIGHT and its receptors (i.e., HVEM and lymphotoxin-β receptor) were regulated during experimental HF, with strong expression in the infarcted area accompanied by up-regulation of HVEM in cardiomyocytes and endothelial cells also in the non-ischaemic part of the left ventricle. (ii) Patients with chronic HF had significantly increased expression of LIGHT on CD3+ T-cells accompanied by increased expression of HVEM on monocytes and within the failing myocardium. (iii) LIGHT induced interleukin (IL)-6 expression in endothelial cells. In HF patients, but not in healthy controls, such an IL-6-inducing effect was also seen in LIGHT activated PBMC.
Conclusion: Our findings in both clinical and experimental HF may suggest a role for LIGHT signalling pathways in the progression of chronic HF involving IL-6-related mechanisms.
Key Words: Heart failure Inflammation Cytokines Tumour necrosis factor superfamily Leukocytes
Received August 27, 2007; Revised November 26, 2007; Accepted February 4, 2008
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