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Heterogeneous toroidal spiral particles for islet encapsulation.

Paola Leon Plata1, Maryam Zaroudi, Chun-Yin Lee

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New toroidal spiral particles (TSPs) offer a robust and retrievable macro-encapsulation system for type 1 diabetes treatment. These flexible, millimeter-sized particles ensure effective cell function and show minimal inflammatory response in preliminary studies.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Endocrinology

Background:

  • Cell encapsulation is a promising strategy for treating endocrine diseases like type 1 diabetes.
  • Current micro-capsules face challenges in robustness and retrievability for clinical translation.
  • Existing macro-devices may suffer from suboptimal mass transfer due to their configuration.

Purpose of the Study:

  • To design and characterize a novel millimeter-sized particle system, toroidal spiral particles (TSPs), for cell encapsulation.
  • To evaluate the TSPs' capacity for cell loading, viability, and therapeutic function.
  • To assess the preliminary biocompatibility and potential for safe transplantation and retrieval.

Main Methods:

  • Fabrication of poly-ethylene glycol (PEG)-based TSPs with internal toroidal spiral channels.
  • Optimization of particle mechanical properties, glucose, and insulin permeability.
  • Encapsulation of islets of Langerhans and assessment of cell viability and glucose-stimulated insulin secretion (GSIS).
  • In vivo biocompatibility testing in C57BL/6 mice via intraperitoneal transplantation.

Main Results:

  • TSPs demonstrated high encapsulation capacity (∼160 IEQ per TSP) and excellent cell viability.
  • TSP-encapsulated islets exhibited comparable GSIS to naked islets.
  • Preliminary 4-week transplantation in mice showed minimal inflammatory response.

Conclusions:

  • TSPs offer a flexible yet robust macro-encapsulation system with favorable mass transfer properties.
  • The unique internal structure facilitates efficient molecular diffusion for encapsulated cells.
  • TSPs represent a potentially safe and effective platform for cell transplantation and retrieval in type 1 diabetes and other cell therapies.