The Effect of Tumor Necrosis Factor-alpha in Cultured Neonatal Rat Cardiomyocytes
Journal of the Korean Pediatric Society
;
: 1262-1268, 2001.
Artigo
em Coreano
| WPRIM
| ID: wpr-70085
ABSTRACT
PURPOSE:
Tumor necrosis factor-alpha(TNF-alpha) is a pro-inflammatory cytokine that has been implicated in the pathogenesis of cardiovascular disease. Serum levels of TNF-alpha are elevated in many human cardiac related pathogenic conditions, including heart failure. It is well known that TNF-alpha inhibits myocardial contractility and induces apoptosis of adult rat cardiomyocytes via stimulation of TNF receptor 1. But pathophysiologically relevant low levels of TNF-alpha can not induce apoptosis of neonatal cardiomyocytes. So, we evaluated the effects of different concentrations of TNF-alpha in cultured rat neonatal cardiomyocytes apoptosis or necrosis.METHODS:
Neonatal ventricular myocytes were isolated from 3-day-old rats by stepwise collagenase dissociation, and the cells were cultured for 3 days. After that, cardiomyocytes were treated with low(25 ng/mL) and high(250 ng/mL) concentration of TNF-alpha for 48 hours. Apoptosis was determined by terminal deoxynucleotidyl transfer-mediated end labelling(TUNEL) staining, and cell viability was evaluated by lactate dehydrogenase(LDH) measurements using cell culture supernatants.RESULTS:
Low dose TNF-alpha did not induce apoptosis compared with controls(10.5 +/- 3.5% 10.4 +/- 4.3%). And high dose TNF-alpha also did not induce significant apoptosis(10.2 +/- 3.6% 10.4 +/- 4.3%). There was no detectable morphological changes of cardiomyocytes after low and high concentration of TNF-alpha treatment. LDH levels after TNF-alpha treatment was not significant compared with control(control low high, 3.2 +/- 0.1% 3.1 +/- 0.2% 3.3 +/- 0.3%).CONCLUSIONS:
Our results suggest that high concentration of TNF-alpha alone can not induce apoptosis and significant cytotoxicity in neonatal rat cardiomyocytes.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Doenças Cardiovasculares
/
Sobrevivência Celular
/
Fator de Necrose Tumoral alfa
/
Colagenases
/
Apoptose
/
Receptores do Fator de Necrose Tumoral
/
Técnicas de Cultura de Células
/
Ácido Láctico
/
Células Musculares
/
Miócitos Cardíacos
Limite:
Animais
/
Humanos
Idioma:
Coreano
Revista:
Journal of the Korean Pediatric Society
Ano de publicação:
2001
Tipo de documento:
Artigo
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