Cardioprotective Effect of IGF-1 in Mouse with Adriamycin Induced Cardiomyopathy
Korean Circulation Journal
;
: 1116-1123, 2002.
Article
Dans Coréen
| WPRIM
| ID: wpr-148816
ABSTRACT
BACKGROUND AND OBJECTIVES:
The purpose of this study was to investigate the apoptotic pathway, and the effect and mechanism of IGF-1 (insulin like growth factor 1) as a therapeutic agent, in Adriamycin (ADR) induced cardiomyopathy. MATERIALS ANDMETHODS:
We divided 17 mice into ADR (n=6), ADR +IGF-1 (n=6) and saline (n=5) groups. The following were injected into the intraperitoneal cavity for the specified periods 2.5 mg/kg of ADR every week for 6 weeks, 0.1 mg/kg of IGF-1 in the 5th and 6th weeks and 10 mL/kg of saline every week for 6 weeks. Transthoracic echocardiography, with a 15MHz linear array, was performed before and after injection of the drugs. A TUNEL assay and immunohistochemical staining for Bax, bcl-2, capase-8 and 9, and western blotting for Bax and bcl-2 were performed on the myocardium.RESULTS:
The fractional shortening decreased (38.5+/-3.2% before vs. 29.2+/-5.5% after, p<0.05) and the left ventricular end systolic dimension increased (2.5+/-0.3 mm before vs. 3.1+/-0.5 mm after, p<0.05) following the injection of the ADR, but there were no interval changes in the mice treated with saline or ADR+IGF-1. The TUNEL assay showed a higher apoptotic index in the mice treated with ADR than in those treated with saline or ADR+IGF-1 (46+/-8% in ADR, 0.1+/-0.03% in control, 22+/-5% in ADR+IGF-1, p<0.05). The immunohistochemical staining and western blot showed an increase in the expression of Bax, and a decrease in the expression of bcl-2 in the mice treated with ADR than in those treated with ADR+IGF-1 or saline.CONCLUSION:
The apoptosis caused by the increased expression of Bax, and the decreased expression of bcl-2, was an important pathogenetic mechanism, and the IGF-1 prevents the progression of cardiomyopathy by attenuating the expressions of Bax and bcl-2 in ADR induced cardiomyopaththy.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Facteur de croissance IGF-I
/
Échocardiographie
/
Cardiomyopathie dilatée
/
Doxorubicine
/
Technique de Western
/
Apoptose
/
Méthode TUNEL
/
Cardiomyopathies
/
Myocarde
Limites du sujet:
Animaux
langue:
Coréen
Texte intégral:
Korean Circulation Journal
Année:
2002
Type:
Article
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