ISSN:
1432-2307
Keywords:
Enterovirus
;
Myocarditis
;
Dilated cardiomyopathy
;
Cytokine
;
Reverse transcriptase polymerase chain reaction
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Viral infection, especially by enteroviruses, has been considered to be the most common cause of myocarditis, which may progress to dilated cardiomyopathy (DCM). Although the mechanism of progression remains uncertain, a cytokine-associated injury of myocytes has been proposed. Using reverse transcriptase polymerase chain reaction (RT-PCR), we examined the expression of interleukin 1β (IL-1β), IL-6, IL-8 and tumour necrosis factor alpha (TNF-α) and the presence of enteroviral genomic RNA in endomyocardial biopsy tissues obtained from patients with myocarditis and DCM. We examined endomyocardial biopsy tissues obtained from 6 patients with myocarditis, 21 with DCM and 15 with non-infectious cardiac diseases as controls. In patients with myocarditis, endomyocardial biopsy was performed twice at an interval of 1 month to 8 years after the onset of myocarditis. We used RT-PCR to detect IL-1β, IL-6, IL-8 and TNF-α genes expression and nested RT-PCR (nRT-PCR) to detect enteroviral genomic RNA. IL-1β, IL-6, IL-8 and TNF-α genes were expressed in 100% (6/6) and enteroviral genomic RNA in 67% (4/6) of myocarditis patients at the first biopsy. At the second biopsy, IL-1β, IL-6, IL-8 and TNF-α genes were expressed in none, 50% (3/6), 67% (4/6) and 67% (4/6), respectively, and enteroviral genomic RNA in 67% (4/6). Four patients with myocarditis, in whom IL-8 and TNF-α genes and enteroviral genomic RNA were detected, progressed to DCM at the second biopsy. IL-1β, IL-6, IL-8 and TNF-α genes were expressed in none, 24% (5/21), 38% (8/21), 57% (12/21) of DCM patients, respectively. Enteroviral genomic RNA was detected in 43% (9/21) of DCM. Neither cytokine expression nor enteroviral genomic RNA were detected in the controls. The high incidence of cytokines, especially IL-6, IL-8 and TNF-α, expression in myocarditis and DCM, which might be induced by enteroviral infection, suggests that cytokines play an important role in myocytic damage leading to DCM.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00199511
Permalink
