Plasma concentrations of tumour necrosis factor-alpha, tumour necrosis factor-related apoptosis-inducing ligand, and FasLigand/CD95L in patients with Chagas cardiomyopathy correlate with left ventricular dysfunction.
OBJECTIVE
Cardiomyocyte apoptosis is reported to be involved in the pathogenesis of human chronic Chagas cardiomyopathy (CCC). Members of the tumour necrosis factor (TNF) superfamily (TNF-alpha, FasLigand/CD95L, and TNF-related apoptosis-inducing ligand) are known to activate the death receptor pathway. We therefore investigated whether levels of TNF-alpha, FasLigand/CD95L, and TRAIL correlated with changes in heart function of patients with Chagas disease (n = 31).


RESULTS
Concentrations of TNF-alpha and TRAIL were clearly augmented in individuals with severe form CCC (n = 16). Levels of FasLigand/CD95L were greater in chagasic patients than in non-infected individuals (n = 15) but did not differentiate between clinical forms of Chagas disease. There was a good correlation between TNF-alpha (r = 0.85 and r = 0.68, P < 0.0001) or TRAIL (r = 0.68 and r = 0.60, P < 0.001) and left ventricular ejection fraction (LVEF) and left ventricular diastolic diameter (LVDD), respectively. In addition, TNF-alpha (r = 0.57, P = 0.0001), TRAIL (r = 0.56, P = 0.001), and FasLigand/CD95L (r = 0.51, P = 0.001) showed a good correlation with brain natriuretic peptide, a well-known parameter of ventricular dysfunction in CCC. There was a weak correlation between levels of FasLigand/CD95L (r = 0.50, P < 0.004) and both LVEF and LVDD. There was no correlation between levels of TNF superfamily ligands and chronotropic incompetence, maximal heart rate, or number of ventricular premature beats in 24 h.


CONCLUSIONS
Plasma levels of TNF superfamily ligands are elevated in patients with functional but not arrhythmogenic disturbances, and these death receptor ligands may be potential markers of ventricular dysfunction in CCC.
Lula
Jamille Fernandes
JF
Laboratório de doença de Chagas, Departamento de Ciências Biológicas & Núcleo de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Campus universitário, Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brazil.
Rocha
Manoel Otavio da Costa
MO
Nunes
Maria do Carmo Pereira
Mdo C
Ribeiro
Antônio Luiz Pinho
AL
Teixeira
Mauro Martins
MM
Bahia
Maria Terezinha
MT
Talvani
André
A
D000328:Adult; D000704:Analysis of Variance; D015415:Biomarkers; D016022:Case-Control Studies; D002598:Chagas Cardiomyopathy / Q000097:blood / Q000503:physiopathology*; D002908:Chronic Disease; D053222:Fas Ligand Protein / Q000097:blood*; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D053221:TNF-Related Apoptosis-Inducing Ligand / Q000097:blood*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood; D018487:Ventricular Dysfunction, Left / Q000097:blood / Q000503:physiopathology*
D015415:Biomarkers; D053222:Fas Ligand Protein; D053221:TNF-Related Apoptosis-Inducing Ligand; D014409:Tumor Necrosis Factor-alpha