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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...

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Updated: Dec 9, 2025

Testing the Efficacy of Pharmacological Agents in a Pericardial Target Delivery Model in the Swine

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Published on: July 7, 2016

Optimizing delivery for efficient cardiac reprogramming.

Martin H Kang¹, Jiabiao Hu¹, Richard E Pratt¹

¹Mandel Center for Heart and Vascular Research, and the Duke Cardiovascular Research Center, Duke University Medical Center, Durham, NC, 27710, USA.

Biochemical and Biophysical Research Communications

|September 12, 2020

Summary

This summary is machine-generated.

Optimized delivery of microRNAs (miRNAs) and transcription factors can convert scar-forming fibroblasts into new cardiomyocytes after heart injury. This novel approach enhances cardiac repair and function by improving reprogramming efficiency.

Keywords:

Cardiac reprogramming Cardiomyocytes Stoichiometry miRNAs

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Last Updated: Dec 9, 2025

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Published on: August 26, 2021

Area of Science:

Cardiovascular Biology
Regenerative Medicine
Molecular Therapy

Background:

Heart injury leads to cardiomyocyte loss and scar formation by fibroblasts, impairing cardiac function.
Previous methods using microRNA combinations (miR combo) or transcription factors (GMT) showed modest success in converting fibroblasts to cardiomyocytes due to inefficient delivery.

Purpose of the Study:

To enhance the efficiency of fibroblast-to-cardiomyocyte reprogramming for improved cardiac repair.
To optimize the delivery of reprogramming factors for greater therapeutic impact in cardiovascular disease.

Main Methods:

Developed a multicistronic system for co-expression of four specific miRNAs (miR combo) from a single construct.
Investigated the impact of miRNA order within the construct on reprogramming efficiency.
Screened Adeno-Associated Virus (AAV) serotypes for targeted delivery to cardiac fibroblasts, identifying AAV1 as a suitable vector.
Combined multicistronic miRNA expression with AAV1 delivery for in vivo fibroblast reprogramming.

Main Results:

A multicistronic construct with equivalent miRNA expression levels demonstrated the highest reprogramming efficiency.
AAV1 showed specific tropism for cardiac fibroblasts, enabling targeted delivery.
The combination of multicistronic expression and AAV1 delivery robustly reprogrammed cardiac fibroblasts into cardiomyocytes in vivo.

Conclusions:

Optimized delivery strategies, including multicistronic systems and targeted AAV vectors, significantly improve the efficiency of cardiac fibroblast reprogramming.
This enhanced reprogramming holds promise for developing novel therapies to regenerate heart tissue and restore cardiac function after injury.