(Circulation. 2001;103:730.)
© 2001 American Heart Association, Inc.
Basic Science Reports |
Pressure Overload Increases GATA4 Binding Activity via Endothelin-1
From the Departments of Pharmacology and Toxicology and Physiology (O.V.), Biocenter Oulu, University of Oulu, Finland.
Correspondence to Heikki Ruskoaho, MD, PhD, Department of Pharmacology and Toxicology, Faculty of Medicine, University of Oulu, PO Box 5000, FIN-90014, University of Oulu, Finland. E-mail heikki.ruskoaho{at}oulu.fi
Background—The signaling cascades responsible for the activation of transcription factors in the hypertrophic growth of cardiac myocytes during hemodynamic overload are largely unknown. Several of the genes upregulated in the hypertrophied heart, including B-type natriuretic peptide (BNP) gene, are controlled by the cardiac-restricted zinc finger transcription factor GATA4.
Methods and Results—An in vivo model of intravenous administration of arginine8-vasopressin (AVP) for up to 4 hours in conscious normotensive rats was used to study the signaling mechanisms for GATA activation in response to pressure overload. Gel mobility shift assays were used to analyze the trans-acting factors that interact with the GATA motifs of the BNP promoter. AVP-induced increase in mean arterial pressure was followed by a significant increase in the BNP and c-fos mRNA levels in both the endocardial and epicardial layers of the left ventricle, whereas GATA4 and GATA6 mRNA levels remained unchanged. Pressure overload within 15 to 60 minutes produced an increase in left ventricular BNP GATA4 but not GATA5 and GATA6 binding activity, and at 30 minutes a 2.2-fold increase (P<0.001) in GATA4 binding was noted. The mixed endothelin-1 ETA/ETB receptor antagonist bosentan but not the angiotensin II type 1 receptor antagonist losartan completely inhibited the pressure overload–induced increase in left ventricular BNP GATA4 binding activity. Bosentan alone had no statistically significant effect on GATA4 binding activity of the left ventricle in conscious animals.
Conclusions—ET-1 is a signaling molecule that rapidly upregulates GATA4 DNA binding activity in response to pressure overload in vivo.
Key Words: hypertrophy • blood pressure • natriuretic peptides • genes
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