Why the study?
Chronotropic incompetence is common in hypertensive heart disease, but the underlying basis for this is poorly understood.
Does PDE4D knockdown or inhibition improve heart rate responses to β-adrenergic stimulation in mice with AngII-induced hypertensive heart disease?
Population
C57BL/6 mice infused with saline or AngII
Comparison
AngII infusion vs saline infusion
Design
Preclinical animal study
Follow-up
3 weeks
Key result
AngII-induced hypertensive heart disease in mice impaired heart rate responses to β-AR stimulation due to up-regulation of PDE4D and reduced cAMP effects in sinoatrial node myocytes.
Authors
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Hypothesis-generating for PDE4D inhibition in chronotropic incompetence; extends mechanistic insights in hypertensive models but requires human validation.
Does PDE4D knockdown or inhibition improve heart rate responses to β-adrenergic stimulation in mice with AngII-induced hypertensive heart disease?
PDE4D up-regulation mediates impaired β-adrenergic receptor signaling and chronotropic incompetence in a mouse model of hypertensive heart disease, which can be reversed by PDE4D knockdown or inhibition.
Dorey et al. (2023) studied AngII-induced hypertensive heart disease. Angiotensin II (AngII) vs. Saline was evaluated on Heart rate and sinoatrial node function in response to the β-AR agonist isoproterenol. AngII-induced hypertensive heart disease in mice impaired heart rate responses to β-AR stimulation due to up-regulation of PDE4D and reduced cAMP effects in sinoatrial node myocytes.
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