The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.
Early and Delayed Consequences of β 2 -Adrenergic Receptor Overexpression in Mouse Hearts: Critical Role for Expression Level
Abstract
Background —Transgenic cardiac β 2 -adrenergic receptor (AR) overexpression has resulted in enhanced signaling and cardiac function in mice, whereas relatively low levels of transgenically expressed G αs or β 1 AR have resulted in phenotypes of ventricular failure. Potential relationships between the levels of βAR overexpression and biochemical, molecular, and physiological consequences have not been reported. Methods and Results —We generated transgenic mice expressing β 2 AR at 3690, 7120, 9670, and 23 300 fmol/mg in the heart, representing 60, 100, 150, and 350 times background βAR expression. All lines showed enhanced basal adenylyl cyclase activation but a decrease in forskolin- and NaF-stimulated adenylyl cyclase activities. Mice of the highest-expressing line developed a rapidly progressive fibrotic dilated cardiomyopathy and died of heart failure at 25±1 weeks of age. The 60-fold line exhibited enhanced basal cardiac function without increased mortality when followed for 1 year, whereas 100-fold overexpressors developed a fibrotic cardiomyopathy and heart failure, with death occurring at 41±1 weeks of age. Adenylyl cyclase activation did not correlate with early or delayed decompensation. Propranolol administration reduced baseline +dP/dt max to nontransgenic levels in all β 2 AR transgenics except the 350-fold overexpressors, indicating that spontaneous activation of β 2 AR was present at this level of expression. Conclusions —These data demonstrate that the heart tolerates enhanced contractile function via 60-fold β 2 AR overexpression without detriment for a period of ≥1 year and that higher levels of expression result in either aggressive or delayed cardiomyopathy. The consequences for enhanced βAR function in the heart appear to be highly dependent on which signaling elements are increased and to what extent.
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Cites
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Enhanced Myocardial Function in Transgenic Mice Overexpressing the β 2 -Adrenergic Receptor
Milano, C. A., Allen, L. F., Rockman, H. A., Dolber, P. C., McMinn, T. R., Chien, K. R., Johnson, T. D., Bond, R. A., & Lefkowitz, R. J. (1994) · Science · doi:10.1126/science.8160017 · Cited by 740
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Transgenic Gαq overexpression induces cardiac contractile failure in mice
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The Sympathetic Nervous System in Heart Failure
Triposkiadis, F., Karayannis, G., Giamouzis, G., Skoularigis, J., Louridas, G., & Butler, J. (2009) · Journal of the American College of Cardiology · doi:10.1016/j.jacc.2009.05.015 · Cited by 978
Seven-transmembrane-spanning receptors and heart function
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Type 5 Adenylyl Cyclase Disruption Increases Longevity and Protects Against Stress
Yan, L., Vatner, D. E., O'Connor, J. P., Ivessa, A., Ge, H., Chen, W., Hirotani, S., Ishikawa, Y., Sadoshima, J., & Vatner, S. F. (2007) · Cell · doi:10.1016/j.cell.2007.05.038 · Cited by 353
Catecholamines, Cardiac β-Adrenergic Receptors, and Heart Failure
Lefkowitz, R. J., Rockman, H. A., & Koch, W. J. (2000) · Circulation · doi:10.1161/01.cir.101.14.1634 · Cited by 291
Xiao, R.-P. (2001) · Science's STKE · doi:10.1126/stke.2001.104.re15 · Cited by 264
Metadata
- Authors
- Liggett, S. B., Tepe, N. M., Lorenz, J. N., Canning, A. M., Jantz, T. D., Mitarai, S., Yatani, A., & Dorn, G. W.
- Venue
- Circulation
- Published
- 2000-04-11
- Volume
- 101
- Issue
- 14
- Pages
- 1707-1714
- ISSN
- 0009-7322 (ISSN-L)
- 1524-4539
- OpenAlex
- W1994103758
- Cited by
- 395
- References
- 22
- FWCI
- 13.07
- Type
- journal article
- Language
- en
- Open access
- closed
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- Liggett, S. B., Tepe, N. M., Lorenz, J. N., Canning, A. M., Jantz, T. D., Mitarai, S., Yatani, A., & Dorn, G. W. (2000). Early and Delayed Consequences of β 2 -Adrenergic Receptor Overexpression in Mouse Hearts: Critical Role for Expression Level. Circulation. https://doi.org/10.1161/01.cir.101.14.1707
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