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Postmodification with Polycations Enhances Key Properties of Alginate-Based Multicomponent Microcapsules.

Faeze Dorchei1, Abolfazl Heydari1,2, Zuzana Kroneková1,2

  • 1Department for Biomaterials Research, Polymer Institute of the Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia.

Biomacromolecules
|June 10, 2024
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Summary
This summary is machine-generated.

Polyelectrolyte postmodification of alginate microspheres impacts their properties. Polycations unexpectedly improved mechanical resistance and biocompatibility in vivo, with minimal impact on encapsulated cells.

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Area of Science:

  • Biomaterials science
  • Cell encapsulation technology
  • Drug delivery systems

Background:

  • Alginate microspheres are widely used for cell encapsulation.
  • Polyelectrolyte (PE) postmodification influences microsphere stability and permeability.
  • Limited understanding exists on how PE charge and structure affect microsphere properties in vivo.

Purpose of the Study:

  • To investigate the impact of polyelectrolyte (PE) postmodification on alginate-based microcapsule morphology and properties.
  • To evaluate the in vivo performance and biocompatibility of modified microcapsules in a mouse model.
  • To elucidate the mechanisms behind PE interaction with alginate microcapsules.

Main Methods:

  • Fabrication of multicomponent alginate-based microcapsules.
  • Postmodification with polyelectrolytes (PEs) of varying charge and structure.
  • In vivo implantation in a mouse model.
  • Confocal Raman microscopy and confocal laser scanning microscopy (CLSM) for structural analysis.
  • Zeta potential measurements.
  • Human whole blood assay for inflammatory and coagulation potential.

Main Results:

  • Polyelectrolyte (PE) postmodification significantly altered microcapsule mechanical resistance and biocompatibility in vivo.
  • Polycationic PEs unexpectedly yielded the most favorable results regarding mechanical properties and biocompatibility.
  • Confocal microscopy revealed stable interpolyelectrolyte complex layers, limiting PE diffusion into the core.
  • Zeta potential measurements indicated PE embedding within the microcapsule membrane.
  • Human whole blood assays showed complex inflammatory and coagulation responses.
  • Most PEs, including polycations, were found to be benign to encapsulated model cells.

Conclusions:

  • Polyelectrolyte (PE) postmodification offers a tunable approach to enhance alginate microcapsule performance for cell encapsulation.
  • The surprising efficacy of polycations highlights the need for further investigation into their specific interactions and benefits.
  • Understanding PE-alginate interactions is crucial for designing optimized microcapsules for biomedical applications.
  • The observed biocompatibility and cell safety suggest potential for therapeutic applications.