Electrocatalytic on-site oxygenation for transplanted cell-based-therapies

Area of Science:

• Biomedical Engineering
• Materials Science
• Cell Biology

Background:

• Implantable cell therapies and tissue transplants require adequate oxygen supply for function.
• Limited vascularization from the host and bulky exogenous oxygenation methods hinder therapeutic efficacy.
• Hypoxic stress and high cell densities pose significant challenges for engineered cell viability.

Purpose of the Study:

• To develop a bioelectronic approach for controlled, on-site oxygen generation in cellular environments.
• To sustain engineered cell viability and therapeutic function under hypoxic stress and high cell densities.
• To overcome limitations of previous oxygenation strategies in terms of size, oxygen production, and regulation.

Main Methods:

• Utilized nanostructured sputtered iridium oxide as a catalyst for the oxygen evolution reaction at neutral pH.
• Developed an electrocatalytic on-site oxygenator integrated into bioelectronic platforms.
• Tested the device's efficacy in sustaining high cell loadings (>60k cells/mm³) in vitro and in vivo under hypoxic conditions.

Main Results:

• Demonstrated selective oxygen production without toxic byproducts.
• Achieved a lower oxygenation onset compared to previous methods.
• Successfully sustained high cell loadings in hypoxic conditions, both in vitro and in vivo.
• Showcased the integration of exogenous oxygen production devices into bioelectronic platforms.

Conclusions:

• Electrocatalytic on-site oxygen generation is a viable strategy to support implantable cell therapies.
• The developed iridium oxide-based system enables high cell loadings in smaller, integrated bioelectronic devices.
• This approach broadens the applicability of engineered cell therapies by addressing oxygen supply limitations.