Key result
Oxidative stress and elastase-mediated β1-receptor cleavage decrease catecholamine responsiveness during cardiac injury and inflammation.
Why the study?
Conventional models do not account for post-translational processing and novel regulatory mechanisms affecting cardiomyocyte β1-adrenergic receptor responsiveness in cardiac injury or inflammation.
This perspective highlights novel mechanisms of β1-adrenergic receptor regulation via post-translational processing, oxidative stress, and elastase cleavage, which may alter catecholamine responsiveness during cardiac injury.
May diversify β1AR signaling in remodeling; leaves open whether truncated forms warrant targeted therapies.
Conventional models view β1-adrenergic receptors (β1ARs) as full-length proteins that activate signaling pathways that influence contractile function and ventricular remodeling - and are susceptible to agonist-dependent desensitization. This perspective summarizes recent studies from my laboratory showing that post-translational processing of the β1-adrenergic receptor N-terminus results in the accumulation of both full-length and N-terminally truncated forms of the β1AR that differ in their signaling properties. We also implicate oxidative stress and β1AR cleavage by elastase as two novel mechanisms that would (in the setting of cardiac injury or inflammation) lead to altered or decreased β1AR responsiveness.
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Susan F. Steinberg (2023) conducted a review in Heart failure. Oxidative stress and elastase cleavage was evaluated. Oxidative stress and β1-adrenergic receptor cleavage by elastase represent novel mechanisms that alter or decrease catecholamine responsiveness in the setting of cardiac injury or inflammation.
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