Ultrasound-targeted microbubble destruction rapidly improves left ventricular function in rats with ischemic cardiac...

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Molecular Cardiology

Background:

• Ultrasound-targeted microbubble destruction (UTMD) has shown promise in treating ischemic heart failure (HF).
• Understanding the underlying mechanisms of UTMD's efficacy in HF is crucial for therapeutic development.

Purpose of the Study:

• To elucidate the mechanism by which UTMD improves cardiac function in a rat model of ischemic heart failure.

Main Methods:

• An ischemic heart failure model was induced in Sprague-Dawley rats.
• Rats were assigned to sham, HF, HF+MB, HF+US, HF+UTMD, HF+UTMD+LY294002, or HF+LY294002 groups.
• Cardiac function was assessed via echocardiography and serum BNP levels. The PI3K/Akt/eNOS pathway, nitric oxide (NO), and ATP levels were analyzed using immunohistochemistry, western blotting, and ELISA. Myocardial tissue was examined using HE staining.

Main Results:

• UTMD significantly improved ejection fraction and fractional shortening in rats with ischemic HF.
• UTMD activated the PI3K/Akt/eNOS signaling pathway and increased the release of NO and ATP.
• Inhibition of the PI3K/Akt/eNOS pathway with LY294002 attenuated the beneficial effects of UTMD on cardiac function and mediator release.

Conclusions:

• UTMD therapy rapidly enhances cardiac function in ischemic heart failure.
• The mechanism involves the activation of the PI3K/Akt/eNOS signaling pathway.
• UTMD promotes the release of nitric oxide and ATP, contributing to improved cardiac performance.