January 1, 2013Frontiers in Physiology109 citationsOpen Access
Targeting cardiac β-adrenergic signaling via GRK2 inhibition for heart failure therapy
Key Result
Targeting GRK2 inhibition, particularly through the βARKct peptide, emerges as a promising therapeutic strategy to improve cardiac function and reverse ventricular remodeling in heart failure.
Structured PICO
P
Population
Preclinical animal models of heart failure (including mice, rats, rabbits, and pigs) and potential human applications
I
Intervention
GRK2 inhibition (via genetic deletion, βARKct peptide, or small molecules such as paroxetine)
GRK2 inhibition, particularly via the βARKct peptide, represents a promising novel therapeutic strategy for heart failure that may complement existing β-blocker therapy by addressing both receptor and non-receptor pathological mechanisms.
Limitations
- Current small molecule inhibitors of GRK2 have limitations precluding human use
- Gene therapy approaches are still in pre-clinical or early planning stages
Abstract
Cardiac cells, like those of the other tissues, undergo regulation through membrane-bound proteins known as G protein-coupled receptors (GPCRs). β-adrenergic receptors (βARs) are key GPCRs expressed on cardiomyocytes and their role is crucial in cardiac physiology since they regulate inotropic and chronotropic responses of the sympathetic nervous system (SNS). In compromised conditions such as heart failure (HF), chronic βAR hyperstimulation occurs via SNS activation resulting in receptor dysregulation and down-regulation and consequently there is a marked reduction of myocardial inotropic reserve and continued loss of pump function. Data accumulated over the last two decades indicates that a primary culprit in initiating and maintain βAR dysfunction in the injured and stressed heart is GPCR kinase 2 (GRK2), which was originally known as βARK1 (for βAR kinase). GRK2 is up-regulated in the failing heart due to chronic SNS activity and targeting this kinase has emerged as a novel therapeutic strategy in HF. Indeed, its inhibition or genetic deletion in several disparate animal models of HF including a pre-clinical pig model has shown that GRK2 targeting improves functional and morphological parameters of the failing heart. Moreover, non-βAR properties of GRK2 appear to also contribute to its pathological effects and thus, its inhibition will likely complement existing therapies such as βAR blockade. This review will explore recent research regarding GRK2 inhibition; in particular it will focus on the GRK2 inhibitor peptide known as βARKct, which represents new hope in the treatment against HF progression.