Multi-interfacial microbubbles controlled sequential cavitation for synergistic vascular destruction/chemotherapeutic...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Oncology

Background:

• Microbubbles are versatile theranostic platforms used for ultrasound imaging, drug delivery, and tumor ablation.
• Conventional microbubbles have limitations in sustained acoustic activity and drug penetration.

Purpose of the Study:

• To engineer doxorubicin (DOX)-loaded multi-interfacial microbubbles (DOX-MIMBs) with enhanced acoustic properties for synergistic tumor therapy.
• To investigate the efficacy of DOX-MIMBs in combining mechanical disruption and chemotherapy for precision tumor treatment.

Main Methods:

• Fabrication of DOX-MIMBs via interfacial self-assembly of hydrophobic mesoporous silica nanoparticles (hMSNs).
• Utilizing low-intensity ultrasound (<3 W/cm²) to induce energy-cascaded cavitation and successive bubble generations.
• Evaluating the synergistic effects of acoustomechanical perturbation and DOX delivery in preclinical tumor models.

Main Results:

• DOX-MIMBs demonstrated sustained acoustic activity and prolonged cavitation duration compared to conventional microbubbles.
• Sequential bubble cavitation induced selective vascular destruction and enhanced DOX penetration into tumors.
• Achieved a 90% tumor volume reduction in renal cell carcinoma models through combined mechano-pharmaceutical therapy.

Conclusions:

• DOX-MIMBs represent a paradigm shift from systemic drug delivery to local mechanochemical tumor suppression.
• This novel delivery system offers a powerful strategy for precision tumor therapy by integrating mechanical disruption and chemotherapy.
• The developed DOX-MIMBs platform holds significant potential for advancing cancer treatment modalities.