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Dually crosslinked degradable polyionic micelles for sustained glucose-responsive insulin release.

Yuhong Ma1, Yu Xing1, Fuwei Han1

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This study introduces dually crosslinked insulin polyionic micelles (DCM@insulin) for improved diabetes treatment. These micelles offer sustained glucose-responsive insulin release, enhancing glycemic control in hyperglycemic environments.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Glucose-sensitive delivery systems are promising for diabetes, but often unstable in hyperglycemia, limiting sustained insulin release.
  • Existing systems face challenges with short-term insulin release and instability in high glucose environments.

Purpose of the Study:

  • To design and evaluate dually crosslinked insulin polyionic micelles (DCM@insulin) for enhanced, sustained glucose-responsive insulin release.
  • To improve the stability and therapeutic efficacy of insulin delivery systems for diabetes management.

Main Methods:

  • Synthesis of triblock polymers incorporating phenylboronic acid and UV-crosslinkable units.
  • Formation of dually crosslinked polyionic micelles encapsulating insulin (DCM@insulin).
  • Evaluation of glucose responsiveness, insulin release kinetics, stability, and in vivo glycemic control.

Main Results:

  • DCM@insulin demonstrated enhanced glycemic responsiveness and sustained insulin release in hyperglycemic conditions.
  • The dual crosslinking (phenylboronic ester and UV-induced) protected insulin from degradation and burst release.
  • In vivo studies showed DCM@insulin effectively maintained normal blood glucose levels for 6 hours compared to single-crosslinked micelles.

Conclusions:

  • The developed glucose-responsive, dually crosslinked polyionic micelle system shows significant potential for effective diabetes treatment.
  • DCM@insulin offers a stable and sustained approach to insulin delivery, addressing limitations of current systems.