Theranostic oxygen delivery using ultrasound and microbubbles

Area of Science:

• Biomedical Engineering
• Oncology
• Radiotherapy

Background:

• Tumor hypoxia is a significant challenge in cancer treatment, leading to resistance against radiotherapy and chemotherapy.
• Despite decades of research, effective clinical strategies to overcome tumor hypoxia remain elusive.
• Hypoxic cells exhibit increased resistance to radiation and cytotoxic agents, underscoring the need for targeted oxygenation strategies.

Purpose of the Study:

• To investigate the efficacy of ultrasound-triggered oxygen-carrier microbubbles for localized oxygen delivery.
• To explore the potential of this technology for image-guided treatment of hypoxic tumors.
• To enhance the effectiveness of radiotherapy by increasing oxygen levels in tumor microenvironments.

Main Methods:

• Development and simulation of oxygen-carrier microbubbles engineered with low-solubility osmotic gases and long-chain lipids.
• Utilizing ultrasound to trigger the controlled release of oxygen from microbubbles.
• Experimental validation of ultrasound-induced oxygen release and its impact on local oxygen levels.

Main Results:

• Simulations demonstrated that incorporating osmotic gases enhances microbubble persistence and oxygen production.
• Engineered lipid shells increased the oxygen payload during in vivo transit.
• Experimental results confirmed that ultrasound application significantly boosts local oxygen release from microbubbles.

Conclusions:

• Ultrasound-activated oxygen-carrier microbubbles represent a promising method for targeted oxygen delivery to hypoxic tissues.
• This technology enables image-guided oxygen release, potentially improving radiotherapy outcomes for tumors.
• Further development could lead to a widely accepted clinical treatment for overcoming tumor hypoxia.