Overcoming Biological Barriers with Ultrasound

Area of Science:

• Biomedical Engineering
• Drug Delivery Systems
• Acoustic Medicine

Background:

• Biological barriers like blood vessels and cell membranes restrict the passage of macromolecules and nanodroplets.
• Ultrasound technology offers a potential non-invasive method to modulate these barriers for therapeutic applications.

Purpose of the Study:

• To investigate the effect of ultrasound on the permeability of mouse carotid arteries and ovarian carcinoma cells.
• To evaluate the penetration of macromolecules and nanodroplets across biological barriers under ultrasound exposure.

Main Methods:

• Experiments utilized FITC-dextran (70,000 Da) with mouse carotid arteries and Doxorubicin-loaded nanodroplets with ovarian carcinoma cells.
• Unfocused 1-MHz ultrasound (continuous wave and pulsed) was applied to assess its effect on barrier permeabilization.
• Perfluoro-15-crown-5-ether nanodroplets and poly(ethylene oxide)-co-polycaprolactone nanodroplets were employed as drug carriers.

Main Results:

• Ultrasound application successfully permeabilized all tested biological barriers.
• Both FITC-dextran and nanodroplets demonstrated enhanced penetration through the arterial wall with ultrasound.
• Continuous wave ultrasound showed a stronger effect on permeabilization compared to pulsed ultrasound.
• Ultrasound triggered Doxorubicin release and penetration into ovarian carcinoma cell nuclei.

Conclusions:

• Ultrasound effectively enhances the permeability of blood vessels and cell membranes to macromolecules and nanodroplets.
• The findings suggest ultrasound's potential as a tool for improving drug delivery, particularly for nanodroplet-based therapies.
• Further research is needed to elucidate the detailed mechanisms underlying ultrasound-induced permeabilization and drug release.