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A nanoporous, transparent microcontainer for encapsulated islet therapy.

Barjor Gimi¹, Joonbum Kwon, Andrey Kuznetsov

¹The University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Journal of Diabetes Science and Technology

|September 12, 2009

Summary

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This study introduces novel microcontainers with nanoslots for islet cell encapsulation, overcoming limitations of current methods. These containers effectively immunoprotect islets, maintaining their glucose response for potential cell-based therapies.

Area of Science:

Biomaterials Science
Regenerative Medicine
Cell Encapsulation Technology

Background:

Current islet encapsulation methods (polymer microcapsules, MEMS biocapsules) face limitations in permeability control and size, leading to issues like necrosis.
Effective immunoprotection and nutrient transport are critical for successful islet transplantation in cell-based therapies.

Purpose of the Study:

To develop and characterize a new microcontainer for encapsulating and immunoprotecting islets/beta cells for potential allo- or xenotransplantation.
To assess the viability and function of encapsulated islets and demonstrate the feasibility of noninvasive imaging.

Main Methods:

Fabrication of 300-microm SU-8 polymer microcontainers with 50-microm walls and 25-nm nanoslots in the lid.
Encapsulation of isolated mouse islets and assessment of their physiological response to glucose using fluorescence and two-photon imaging over 48 hours.

Keywords:

cell encapsulation cell encapsulation therapy cell therapy immunoisolation immunoprotection microcontainers

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Demonstration of mechanical integrity and feasibility of in vivo imaging using magnetic resonance imaging.

Main Results:

Encapsulated islets exhibited a physiological response to glucose indistinguishable from control islets.
The SU-8 microcontainers maintained mechanical integrity during islet loading and manipulation.
Feasibility of noninvasive in vivo imaging was shown through magnetic resonance imaging of an agarose-filled microcontainer.

Conclusions:

The novel nanoslot microcontainers provide effective immunoprotection and bidirectional transport for encapsulated islets.
These microcontainers represent a promising advancement for cell-based therapies requiring islet transplantation.
The demonstrated islet function and imaging capabilities highlight the potential of this technology.