Abstract
Acute decompensated heart failure (ADHF) is responsible for more than 1 million hospital admissions each year in the US. Clinicians and scientists have developed therapeutic strategies that reduce mortality in patients with chronic heart failure (HF). Despite the widely appreciated magnitude of the ADHF problem, there is still a critical gap in our understanding of the cellular mechanisms involved and effective treatment strategies for hospitalized patients. Irrespective of the etiology, patients with ADHF present with similar symptoms (e.g. edema, altered hemodynamics and congestion) as multiple signaling pathways converge in a common phenotypic presentation. Investigations have shown that patients with ADHF have increased catecholamine levels, which cause chronic stimulation of β-adrenergic receptors. This overstimulation leads to chronic G-protein activation and perturbations in myocyte signaling, as the patient's heart attempts to adapt to progressive HF. Over time, these compensatory signaling mechanisms ultimately fail, and maladaptive signaling prevails with progressive worsening of symptoms. This Review summarizes some of the changes that occur during chronic adrenergic stimulation, and examines how downstream contractile dysfunction and myocyte death can alter the prognosis of patients with HF hospitalized for acute events.
Key Points
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Acute decompensated heart failure (ADHF) is a large clinical problem, yet little is known about the basic mechanisms associated with disease progression; the final common pathway in ADHF is increased adrenergic signaling, independent of ADHF etiology
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Long-term (or maladaptive) adrenergic signaling in ADHF will lead to activation of calcium/calmodulin-dependent protein kinase, increased cytokine levels, nitroso–redox imbalance, and a shift in Ca2+ pools from the sarcoplasmic reticulum to the cytosol
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Maladaptive adrenergic signaling leads to caspase activation, cytochrome c translocation and progressive cell death, leading in turn to progressive worsening of heart function
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Maladaptive adrenergic signaling alters cardiac excitation–contraction coupling, which leads to decreased contractility and an increased propensity for arrhythmias
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Therapeutic targeting of these two common pathways (cell death and altered excitation–contraction coupling) of ADHF may improve patient recovery
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Acknowledgements
We thank Dr Jonathan Davis for critically reading the manuscript. Dr TS Elton (R01 HL048848), Dr DS Feldman (R01 HL084498), and Dr MT Ziolo (R01 HL079283) are supported by the National Institutes of Health.
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Feldman, D., Elton, T., Sun, B. et al. Mechanisms of Disease: detrimental adrenergic signaling in acute decompensated heart failure. Nat Rev Cardiol 5, 208–218 (2008). https://doi.org/10.1038/ncpcardio1127
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DOI: https://doi.org/10.1038/ncpcardio1127
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