New study discovers a novel technique for glucose delivery

Nature achieves remarkable function from the formation of transient, nonequilibrium materials realized through continuous energy input. The role of enzymes in catalysing chemical transformations to drive such processes, often as part of stimuli-directed signalling governs both material formation and lifetime.

In this study a group of researchers from U.S.A demonstrate how they successfully developed hydrogels that remain intact in the presence of glucose but slowly destabilize as levels drop, releasing glucagon into the system, raising glucose levels.

The researchers found that as compared to traditional glucose-responsive materials, which typically engineer degradation to release insulin under high-glucose conditions, the transient nano fibrillar hydrogel materials here get stabilized in the presence of glucose but destabilized under conditions of limited glucose to release encapsulated glucagon.

In the context of blood glucose control, glucagon offers a key antagonist to insulin in responding to hypoglycemia by signalling the release of glucose stored in tissues so as to restore normal blood glucose levels. Accordingly, these materials are evaluated in a prophylactic capacity in diabetic mice to release glucagon in response to a sudden drop in blood glucose brought on by an insulin overdose. Delivery of glucagon using glucose-fueled nano fibrillar hydrogels succeeds in limiting the onset and severity of hypoglycemia in mice.

According to the researchers, the gels should be taken every evening before bed to receive the best protection. The team has stressed that the research is in the very early stages.

This general strategy points to a new paradigm in glucose-responsive materials, leveraging glucose as a stabilizing cue for responsive glucagon delivery in combating hypoglycemia.

Moreover, compared to most fundamental reports achieving nonequilibrium and/or fueled classes of materials, this new investigation offers a rare functional example using a disease-relevant fuel to drive the deployment of a therapeutic.

Reference:

Glucose-Fueled Peptide Assembly: Glucagon Delivery via Enzymatic Actuation by Yu S et. al published in the Journal of the American Chemical Society

https://doi.org/10.1021/jacs.1c04570