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Chinese Medical Journal ; (24): 2134-2138, 2008.
Artículo en Inglés | WPRIM | ID: wpr-350787

RESUMEN

<p><b>BACKGROUND</b>Although the insulinotropic role of glucagon-like peptide-1 (GLP-1) in type 2 diabetes mellitus has been substantiated, its role in cardioprotection remains largely unknown. This study aimed to determine the effects of GLP-1 on injury of rats cardiac myocytes induced by hypoxia-reoxygenation (H/R) and the possible mechanisms.</p><p><b>METHODS</b>The cultured neonatal rats cardiac myocytes were randomly divided into seven groups: the normal control group, the H/R group, the GLP-1 + H/R group, the GLP-1 + H/R + UO126 (the p42/44 mitogen-activated protein kinase (MAPK) inhibitor) group, the GLP-1 + H/R + LY294002 (phosphatidylinositol 3-kinase (PI3K) inhibitor) group, the H/R + UO126 group, and the H/R + LY294002 group. The lactate dehydrogenase (LDH) activity, apoptosis rate of cardiac myocytes, and caspase-3 activity were detected after the injury of H/R.</p><p><b>RESULTS</b>Compared with the normal control group, the activity of LDH, cardiac myocyte apoptosis rate, and caspase-3 activity all increased significantly in the H/R group (P < 0.01). Compared with the H/R group, these three indices all decreased in the H/R + GLP-1 group (P < 0.01). However, the changes of LDH activity, apoptosis rate, and caspase-3 activity were inhibited by LY294002 and UO126 respectively.</p><p><b>CONCLUSIONS</b>GLP-1 can directly act on cardiac myocytes and protect them from H/R injury mainly by inhibiting their apoptosis. Its mechanism may be through the PI3K-Akt pathway and the MAPK signaling pathway.</p>


Asunto(s)
Animales , Ratas , Actinas , Butadienos , Farmacología , Hipoxia de la Célula , Células Cultivadas , Cromonas , Farmacología , Quinasas MAP Reguladas por Señal Extracelular , Fisiología , Péptido 1 Similar al Glucagón , Farmacología , Sistema de Señalización de MAP Quinasas , Morfolinas , Farmacología , Miocitos Cardíacos , Nitrilos , Farmacología , Fosfatidilinositol 3-Quinasas , Fisiología , Ratas Wistar
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