An injectable capillary-like microstructured alginate hydrogel improves left ventricular function after myocardial...

Area of Science:

• Biomaterials Science
• Cardiovascular Research
• Regenerative Medicine

Background:

• Myocardial infarction (MI) leads to adverse cardiac remodeling and impaired heart function.
• Current post-MI therapies aim to mitigate negative remodeling and preserve cardiac function.
• Injectable hydrogels represent a promising therapeutic strategy for damaged myocardium.

Purpose of the Study:

• To investigate the therapeutic potential of Capgel, a novel alginate hydrogel with a unique capillary-like microstructure.
• To evaluate the safety and efficacy of Capgel for intramyocardial injection in a rat model of MI.
• To assess the impact of Capgel on left ventricular function and cardiac remodeling post-MI.

Main Methods:

• Induced anterior myocardial infarction (MI) in Sprague Dawley rats.
• Intramyocardial injection of Capgel into the infarct border zone (n=12) or control (no injection, n=10).
• Echocardiographic assessment of left ventricular function at baseline (48h post-MI) and 4 weeks post-injection.

Main Results:

• Capgel injection significantly improved left ventricular systolic function, with fractional shortening increasing by 27% over 4 weeks (p=0.001).
• The hydrogel was present at the injection site up to 4 weeks, showing integration with host tissue, including macrophages and blood vessels.
• In vitro studies demonstrated sustained release of Angiotensin-(1-7) from Capgel for up to 90 days.

Conclusions:

• Capgel is a safe and effective injectable biomaterial for intramyocardial delivery post-MI.
• Capgel promotes improved left ventricular function and may modulate cardiac remodeling.
• The hydrogel's sustained release of Angiotensin-(1-7) suggests a potential mechanism for its therapeutic benefits.