Arrhythmias & electrophysiology
IRS2 Signaling Protects Against Stress-Induced Arrhythmia by Maintaining Ca 2+ Homeostasis
Authors' conclusion
Cardiac IRS2 inhibits sympathetic stress-induced AKT/NOS3/CaMKII/RyR2 overactivation and calcium-dependent arrhythmogenesis.
Study context
- Population
- Patients with IRS2 variants (EMR database) and cIRS2-KO mice
- Comparison
- cIRS2-KO vs control hearts; IRS2 variant carriers vs matched controls
Methodological detailsretrospective EMR analysis, cardiomyocyte-restricted Irs2 knockout mice
- Retrospective EMR analysis
- Cardiomyocyte-restricted Irs2 knockout mice
Main finding
As reported in the abstract
- IRS2 variants of uncertain significance: potential association with increased arrhythmia risk vs matched controls
- cIRS2-KO hearts prone to catecholamine-sensitive VT and reperfusion VT
- cIRS2-KO: decreased Ca²⁺ transient amplitudes, increased spontaneous Ca²⁺ sparks, reduced SR Ca²⁺ content during sympathetic stress
- Overactivation of AKT1/NOS3/CaMKII/RyR2 pathway led to calcium mishandling and catecholamine-sensitive VT
- Pharmacological AKT inhibition or genetic RyR2 stabilization rescued catecholamine-sensitive VT
Original publication
IRS2 Signaling Protects Against Stress-Induced Arrhythmia by Maintaining Ca 2+ Homeostasis. Circulation. Published 10 September 2024. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →