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• W2158841551 abstract "Fibroblast growth factor-2 (FGF-2) exerts its cardioprotective effect through cell surface receptor signaling and may play a role in the normal maintenance of a healthy myocardium. One mechanism of FGF-2 release from contracting cardiomyocytes is through transient sarcolemmal disruption, with accumulation in the extracellular matrix. Continuous FGF-2 release would require a link to synthesis and, thus, we examined regulation of FGF-2 promoter activity in cardiomyocytes as a potential target for optimizing cardioprotection.To investigate autoregulation, neonatal rat cardiomyocytes, (NRCM), were transfected with approximately 1 or 0.1 kb of rat FGF-2 promoter sequences linked to luciferase, -1058FGF-2p.luc and -110FGF-2p.luc, and treated with or without FGF-2. FGF-2 promoter activity was significantly increased approximately 2.5-fold with both genes. The proximal promoter region of rat FGF-2 contains putative binding sites for the early growth response-1 (Egr-1) and stimulating protein 1 (Sp1) transcription factors. Overexpression of Egr-1 and Sp1 increased -1058FGF-2p.luc expression by 4.4- and 8.7-fold, respectively. Mutation of Egr-1 and overlapping Sp1 sites did not blunt the response of -110FGF-2p.luc to FGF-2 treatment but did significantly reduce basal promoter activity. Transgenic mice expressing -1058FGF-2p.luc were treated with isoproterenol (IsP) to increase heart rate and endogenous FGF-2 release. FGF-2 promoter activity was stimulated significantly at 6 h, and increases in both FGF-2 and its receptor mRNA levels were also detected. In contrast, no effect of IsP was seen on -1058FGF-2p.luc or -110FGF-2p.luc in transfected NRCMs.FGF-2 released from cardiomyocytes may act to regulate its own synthesis at the transcriptional level. The mechanism does not appear to require an intact Egr-1 site in the proximal promoter region. This may, however, reflect redundancy in the control of FGF-2 promoter activity as our data support a stimulatory role for Egr-1 and Sp1." @default.
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• W2158841551 date "2004-06-01" @default.
• W2158841551 modified "2023-09-26" @default.
• W2158841551 title "Transcriptional regulation of FGF-2 gene expression in cardiac myocytes" @default.
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• W2158841551 doi "https://doi.org/10.1016/j.cardiores.2004.01.032" @default.
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