Nanoparticle-Stabilized Oxygen Microcapsules Prepared by Interfacial Polymerization for Enhanced Oxygen Delivery

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cancer Biology

Background:

• Tumor hypoxia, characterized by low oxygen levels, is prevalent in most tumors and promotes cancer progression and treatment resistance.
• Targeting tumor hypoxia represents a promising strategy for improving cancer therapy outcomes.

Purpose of the Study:

• To develop an effective oxygen delivery vehicle for alleviating tumor hypoxia.
• To evaluate the efficacy of these oxygen-delivery microcapsules in vitro and in vivo for cancer treatment.

Main Methods:

• Development of polydopamine-nanoparticle-stabilized oxygen microcapsules via interfacial polymerization.
• In vitro assessment of microcapsule-mediated hypoxia mitigation using hypoxia-green-labeled cells.
• In vivo evaluation of oxygen microcapsules' effect on tumor hypoxia and growth in a subcutaneous tumor model.
• Investigation of synergistic effects of oxygen microcapsules combined with gemcitabine chemotherapy.

Main Results:

• The developed oxygen microcapsules demonstrated excellent biocompatibility.
• In vitro studies confirmed effective improvement of the hypoxia microenvironment, indicated by reduced fluorescent intensity of labeled cells.
• In vivo administration of oxygen microcapsules successfully alleviated tumor hypoxia and suppressed tumor growth.
• Combination therapy with oxygen microcapsules and gemcitabine showed superior tumor growth suppression compared to monotherapy.

Conclusions:

• Polydopamine-nanoparticle-stabilized oxygen microcapsules are effective oxygen delivery vehicles that can ameliorate tumor hypoxia.
• These microcapsules show significant potential as a therapeutic agent for cancer treatment, particularly when used synergistically with chemotherapy.