Divergent pathways mediate the induction of ANF transgenes in neonatal and hypertrophic ventricular myocardium.

Published

Journal Article

To determine whether similar or divergent pathways mediate atrial natriuretic factor (ANF) induction in neonatal and hypertrophied adult ventricular myocardium, and to assess whether studies using an in vitro model system of hypertrophy have fidelity to the in vivo context during pressure overload hypertrophy, we generated transgenic mice which harbor either 638 or 3,003 bp of the rat ANF 5' flanking region ligated upstream from a luciferase reporter. Luciferase activity in the ventricles of day 1 transgenic neonates was 8-24-fold higher than the levels expressed in the ventricles of adult mice. Adult mice expressed the luciferase reporter in an appropriate tissue-specific manner. Transverse aortic constriction of adult mice harboring ANF reporter transgenes demonstrated no significant increase in reporter activity in the ventricle. These findings demonstrate that distinct regions of the ANF 5'-flanking region are required for inducible expression of the ANF gene in the hypertrophic adult ventricle compared with those required for atrial-specific and developmentally appropriate expression in the intact neonatal heart. Furthermore, the cis regulatory elements necessary for induction of ANF expression in endothelin-1 or alpha 1-adrenergically stimulated cultured neonatal ventricular myocytes are not sufficient for induction in the in vivo context of pressure overload hypertrophy.

Full Text

Duke Authors

Cited Authors

  • Knowlton, KU; Rockman, HA; Itani, M; Vovan, A; Seidman, CE; Chien, KR

Published Date

  • September 1995

Published In

Volume / Issue

  • 96 / 3

Start / End Page

  • 1311 - 1318

PubMed ID

  • 7657806

Pubmed Central ID

  • 7657806

International Standard Serial Number (ISSN)

  • 0021-9738

Digital Object Identifier (DOI)

  • 10.1172/JCI118166

Language

  • eng

Conference Location

  • United States