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Updated: Dec 16, 2025
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Published on: December 6, 2024
In Mice Subjected to Chronic Stress, Exogenous cBIN1 Preserves Calcium-Handling Machinery and Cardiac Function
Yan Liu1, Kang Zhou1, Jing Li1
1Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California.
Insights
Gene therapy using cardiac bridging integrator 1 (CBI-1) stabilizes cardiomyocyte membrane compartments. This preserves diastolic function in stressed hearts, offering a potential therapeutic avenue for heart failure with preserved ejection fraction.
Area of Science:
- Cardiovascular Biology
- Molecular Cardiology
- Gene Therapy
Background:
- Heart failure is a significant and increasing cause of illness and death.
- Heart failure with preserved ejection fraction (HFpEF) affects half of patients, yet treatment options remain limited.
- Understanding the molecular mechanisms underlying HFpEF is crucial for developing new therapies.
Purpose of the Study:
- To investigate the role of cardiac bridging integrator 1 (CBI-1) gene therapy in maintaining cardiomyocyte structure.
- To determine if CBI-1 therapy can preserve diastolic function in stressed hearts.
- To explore the potential of targeting intracellular architecture for HFpEF treatment.
Main Methods:
- Utilized gene therapy to deliver CBI-1 to cardiomyocytes.
- Subjected hearts to chronic beta-agonist stimulation and pressure overload to mimic sympathetic stress.
- Assessed intracellular calcium distribution and diastolic function.
Main Results:
- CBI-1 gene therapy successfully stabilized subcellular membrane compartments within cardiomyocytes.
- This stabilization preserved the distribution of calcium-handling machinery.
- Diastolic function was maintained in hearts subjected to chronic stress.
Conclusions:
- Maintenance of intracellular architecture, particularly membrane microdomains at t-tubules, is vital during sympathetic stress.
- CBI-1 gene therapy demonstrates potential for preserving cardiac diastolic function.
- Stabilizing membrane microdomains represents a promising therapeutic strategy for heart failure.
Abstract:
Heart failure is an important, and growing, cause of morbidity and mortality. Half of patients with heart failure have preserved ejection fraction, for whom therapeutic options are limited. Here we report that cardiac bridging integrator 1 gene therapy to maintain subcellular membrane compartments within cardiomyocytes can stabilize intracellular distribution of calcium-handling machinery, preserving diastolic function in hearts stressed by chronic beta agonist stimulation and pressure overload. This study identifies that maintenance of intracellular architecture and, in particular, membrane microdomains at t-tubules, is important in the setting of sympathetic stress. Stabilization of membrane microdomains may be a pathway for future therapeutic development.
