Cyclo-oxygenase-2 (COX-2) expression at the site of recent myocardial infarction: friend or foe?
Heart
; 90(4): 440-3, 2004 Apr.
Article
em En
| MEDLINE
| ID: mdl-15020525
ABSTRACT
BACKGROUND:
Cyclo-oxygenase-2 (COX-2) is induced in cardiomyocytes only in response to stress, such as ischaemia.OBJECTIVE:
To assess COX-2 expression at the site of recent myocardial infarction.METHODS:
COX-2 expression was evaluated by specific immunostaining in cardiomyocytes from 23 subjects who died 10-60 days after acute myocardial infarction. The relation between COX-2 myocardial expression and apoptotic rate was investigated. Cardiomyocyte apoptotic rate was defined as the number of cells co-expressing in situ end labelling of DNA fragmentation (TUNEL) and immunostaining for activated caspase-3.RESULTS:
COX-2 expression was found in cardiomyocytes at the site of infarction in nine of 23 cases (39%). It was associated with fivefold higher apoptotic rates (median 17.9% (interquartile range 11.0-25.4%) v 3.7% (0.6-12.8%); p = 0.016), and apoptotic rate increased progressively from mild to intense COX-2 staining (p for trend 0.009). COX-2 expression co-localised with TUNEL nuclear staining in myocytes, and there was a high concordance between COX-2 and hypoxia induced factor 1-alpha staining (78%, p = 0.021) and between COX-2 and bax (83%, p = 0.014). Subjects showing myocardial COX-2 expression were more likely to have enlarged hearts (p = 0.050), and intense COX-2 staining was strictly associated with symptomatic heart failure (p = 0.035).CONCLUSIONS:
COX-2 is expressed in cardiomyocytes in nearly 40% of cases at the site of recent acute myocardial infarction, even late after the index event. Its expression was associated with extremely high apoptotic rates. These findings suggest a potential cause-effect link between COX-2 expression and enhanced myocardial apoptosis in ischaemic cardiomyopathy.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Contexto em Saúde:
6_ODS3_enfermedades_notrasmisibles
Problema de saúde:
6_cardiovascular_diseases
/
6_ischemic_heart_disease
Assunto principal:
Prostaglandina-Endoperóxido Sintases
/
Isoenzimas
/
Infarto do Miocárdio
Limite:
Aged
/
Aged80
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Heart
Assunto da revista:
CARDIOLOGIA
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Itália