Multivalent insulin receptor activation using insulin-DNA origami nanostructures

Area of Science:

• Biochemistry
• Nanotechnology
• Molecular Biology

Background:

• Insulin receptor (IR) signaling is crucial for metabolic processes.
• Dysfunctional IR signaling is linked to diseases like diabetes, cancer, and neurodegenerative disorders.
• IRs can form nanoclusters on cell membranes, suggesting a role for spatial organization.

Purpose of the Study:

• To investigate how nanoscale spatial organization and multivalency of insulin affect IR activation.
• To develop novel insulin delivery systems with controlled nanoscale properties.
• To explore the therapeutic potential of precisely organized insulin for diabetes treatment.

Main Methods:

• Development of rod-like insulin-DNA origami nanostructures with varying insulin numbers and spacings.
• Assessment of insulin-DNA nanostructure residence time and IR activation levels in adipocytes.
• Evaluation of insulin-mediated transcriptional responses.
• Testing the efficacy of monovalent and multivalent insulin nanostructures in a zebrafish diabetes model.

Main Results:

• Increasing insulin valency on nanostructures significantly prolonged their residence time at IRs.
• Both insulin valency and spacing on nanostructures modulated IR activation levels in adipocytes.
• Multivalent insulin nanostructures demonstrated enhanced insulin-mediated transcriptional responses compared to monovalent ones.
• In vivo, multivalent insulin nanostructures effectively reduced glucose levels in a zebrafish diabetes model.

Conclusions:

• Precise control over insulin multivalency and nanoscale organization can modulate IR responses independently of concentration.
• Insulin nanoscale organization is a promising design parameter for developing advanced insulin therapies.
• This approach offers a new strategy for treating diseases associated with impaired IR signaling.