Innovative microcapsules for pancreatic β-cells harvested from mature double-transgenic mice: cell imaging, viability, induced glucose-stimulated insulin measurements and proinflammatory cytokines analysis

Armin Mooranian, Ryu Tackechi, Emma Jamieson, Grant Morahan, Hani Al-Salami

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Recently we demonstrated that microencapsulation of a murine pancreatic beta-cell line using an alginate-ursodeoxycholic acid (UDCA) matrix produced microcapsules with good stability and cell viability. In this study, we investigated if translation of this formulation to microencapsulation of primary beta-cells harvested from mature double-transgenic healthy mice would also generate stable microcapsules with good cell viability.

Islets of Langerhans were isolated from Ngn3-GFP/RIP-DsRED mice by intraductal collagenase P digestion and density gradient centrifugation, dissociated into single cells and the beta-cell population purified by Fluorescence Activated Cell Sorting. beta-cells were microencapsulated using either alginate-poly-l-ornithine (F1; control) or alginate-poly-l-ornithine-UDCA (F2; test) formulations. Microcapsules were microscopically examined and microencapsulated cells were analyzed for viability, insulin and cytokine release, 2 days post-microencapsulation.

Microcapsules showed good uniformity and morphological characteristics and even cell distribution within microcapsules with or without UDCA. Two days post microencapsulation cell viability, mitochondrial ATP and insulin production were shown to be optimized in the presence of UDCA whilst production of the proinflammatory cytokine IL-1 beta was reduced. Contradictory to our previous studies, UDCA did not reduce production of any other pro-inflammatory biomarkers.

These results suggest that UDCA incorporation improves microcapsules' physical and morphological characteristics and improves the viability and function of encapsulated mature primary pancreatic beta-cells.

Original languageEnglish
Pages (from-to)1217-1223
Number of pages7
JournalPharmaceutical Research
Issue number6
Publication statusPublished - Jun 2017

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