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Mol Cell Endocrinol. 2007 Jul 15;273(1-2):59-67. Epub 2007 May 16.

Cardiac BNP gene activation by angiotensin II in vivo.

Author information

1
Department of Physiology, Biocenter Oulu, University of Oulu, Oulu FIN-90014, Finland.

Abstract

The transcription factors involved in the activation of cardiac gene expression by angiotensin II (Ang II) in vivo are not well understood. Here we studied the contribution of transcriptional elements to the activation of the cardiac B-type natriuretic peptide (BNP) gene promoter by Ang II in conscious rats and in angiotensin II type 1 receptor (AT1R) transgenic mice. Rat BNP luciferase reporter gene constructs were injected into the left ventricular wall. The mean luciferase activity was 1.8-fold higher (P<0.05) in the ventricles of animals subjected to 2-week Ang II infusion as compared with vehicle infusion. Our results indicate that GATA binding sites at -90 and -81 in the rat BNP promoter are essential for the in vivo response to Ang II. The GATA factor binding to these sites is GATA-4. BNP mRNA levels and GATA-4 binding activity are also increased in the hypertrophied hearts of aged AT1R transgenic mice.

PMID:
17587490
DOI:
10.1016/j.mce.2007.05.003
[Indexed for MEDLINE]

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