A bioinspired scaffold for rapid oxygenation of cell encapsulation systems.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34615868.
- Also identified by DOI 10.1038/s41467-021-26126-w and PMC identifier 8494927.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Inadequate oxygenation is a major challenge in cell encapsulation, a therapy which holds potential to treat many diseases including type I diabetes. In such systems, cellular oxygen (O<sub>2</sub>) delivery is limited to slow passive diffusion from transplantation sites through the poorly O<sub>2</sub>-soluble encapsulating matrix, usually a hydrogel. This constrains the maximum permitted distance between the encapsulated cells and host site to within a few hundred micrometers to ensure cellular function. Inspired by the natural gas-phase tracheal O<sub>2</sub> delivery system of insects, we present herein the design of a biomimetic scaffold featuring internal continuous air channels endowed with 10,000-fold higher O<sub>2</sub> diffusivity than hydrogels. We incorporate the scaffold into a bulk hydrogel containing cells, which facilitates rapid O<sub>2</sub> transport through the whole system to cells several millimeters away from the device-host boundary. A computational model, validated by in vitro analysis, predicts that cells and islets maintain high viability even in a thick (6.6 mm) device. Finally, the therapeutic potential of the device is demonstrated through the correction of diabetes in immunocompetent mice using rat islets for over 6 months.
Medical subject headings
- Oxygen