Key result
Immune cell β2-receptor deletion in mice reduces cardiac injury and improves function via less macrophage infiltration.
Why the study?
Does the lack of immune cell β2-adrenergic receptors reduce cardiac injury and improve function in a mouse model of isoproterenol-induced heart failure?
Does the lack of immune cell β2-adrenergic receptors reduce cardiac injury and improve function in a mouse model of isoproterenol-induced heart failure?
Immune cell β2-adrenergic receptors play a critical role in mediating proinflammatory macrophage infiltration and subsequent cardiac injury in response to chronic β-adrenergic stimulation.
Hypothesis-generating for immune cell β2-AR targeting in HF; human studies needed before clinical translation.
Immune cell β 2 -adrenergic receptors (β 2 ARs) are important for proinflammatory macrophage infiltration to the heart in a chronic isoproterenol administration model of heart failure. Mice lacking immune cell β 2 AR have decreased immune cell infiltration to their heart, primarily proinflammatory macrophage populations. This decrease culminated to decreased cardiac injury with lessened cardiomyocyte death, decreased interstitial fibrosis and hypertrophy, and improved function demonstrating that β 2 AR regulation of immune responses plays an important role in the heart’s response to persistent βAR stimulation.
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Tanner et al. (2021) studied Heart failure. Deletion of immune cell β2-adrenergic receptors vs. Control mice was evaluated on Cardiac injury, immune cell infiltration, interstitial fibrosis, hypertrophy, and cardiac function. Mice lacking immune cell β2-adrenergic receptors exhibited decreased proinflammatory macrophage infiltration, resulting in reduced cardiac injury, fibrosis, and hypertrophy, and improved cardiac function.
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