Taipei Medical University

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Wang BW
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------>journal_name=Am J Physiol Heart Circ Physiol
------>paper_name=Mechanical stretch enhances the expression of resistin gene in cultured cardiomyocytes via tumor necrosis factor-alpha
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------>fullAbstract=The heart is a resistin target tissue and can function as an autocrine organ. We sought to investigate whether cyclic mechanical stretch could induce resistin expression in cardiomyocytes and to test whether there is a link between the stretch-induced TNF-alpha and resistin. Neonatal Wistar rat cardiomyocytes grown on a flexible membrane base were stretched by vacuum to 20% of maximum elongation at 60 cycles/min. Cyclic stretch significantly increased resistin protein and mRNA expression after 2-18 h of stretch. Addition of PD-98059, TNF-alpha antibody, TNF-alpha receptor antibody, and ERK MAP kinase small interfering RNA 30 min before stretch inhibited the induction of resistin protein. Cyclic stretch increased, whereas PD-98059 abolished, the phosphorylated ERK protein. Gel-shift assay showed a significant increase in DNA-protein binding activity of NF-kappaB after stretch, and PD-98059 abolished the DNA-protein binding activity induced by cyclic stretch. DNA binding complexes induced by cyclic stretch could be supershifted by p65 monoclonal antibody. Cyclic stretch increased resistin promoter activity, whereas PD-98059 and p65 antibody decreased resistin promoter activity. Cyclic stretch significantly increased TNF-alpha secretion from myocytes. Recombinant resistin protein and conditioned medium from stretched cardiomyocytes reduced glucose uptake in cardiomyocytes, and recombinant small interfering RNA of resistin or TNF-alpha antibody reversed glucose uptake. In conclusion, cyclic mechanical stretch enhances resistin expression in cultured rat neonatal cardiomyocytes. The stretch-induced resistin is mediated by TNF-alpha, at least in part, through ERK MAP kinase and NF-kappaB pathways. Glucose uptake in cardiomyocytes was reduced by resistin upregulation.
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------>authors2=Hung HF
------>authors3=Chang H
------>authors4=Kuan P
------>authors5=Shyu KG
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------>authors=Wang BW
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------>updateTitle=Mechanical stretch enhances the expression of resistin gene in cultured cardiomyocytes via tumor necrosis factor-alpha.
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------>publish_year=2007
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z