Biodegradable oligo(amidoamine/β-amino ester) hydrogels for controlled insulin delivery

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Developing injectable hydrogels for controlled drug release is crucial for therapeutic applications.
• Oligo(amidoamine/β-amino ester) (OAAAE) presents a potential platform for biodegradable hydrogel formation.
• Physiological conditions require hydrogels that are stable yet responsive to environmental cues.

Purpose of the Study:

• To design and synthesize an injectable biodegradable hydrogel system for controlled insulin release.
• To investigate the properties and performance of the OAAAE-based hydrogel under physiological conditions.
• To evaluate the in vitro and in vivo insulin release profiles.

Main Methods:

• Oligomerization of TMDP with ODA and HDA via Michael addition to synthesize OAAAE.
• Characterization of the oligomer using 1H NMR and GPC.
• Formation of a complex hydrogel by mixing insulin with OAAAE solution and adjusting pH/temperature.
• Assessment of hydrogel degradation, insulin's influence on gel properties, cytotoxicity, and in vitro/in vivo insulin release.

Main Results:

• OAAAE was successfully synthesized and characterized.
• The OAAAE solution exhibited a pH-dependent gel-sol transition (pH 6.8-7.4).
• A complex hydrogel incorporating insulin was formed, showing controlled release in vitro and in vivo.
• The in vivo insulin release profile from the complex hydrogel was successfully evaluated and compared to a neutral hydrogel.

Conclusions:

• The injectable OAAAE-based hydrogel system is effective for controlled insulin release.
• The biodegradable nature and physiological responsiveness of the hydrogel make it a promising candidate for diabetes therapy.
• This hydrogel platform offers potential for advanced drug delivery applications.