DOI of the published article https://doi.org/10.1021/acsbiomaterials.7b00404
Magnetic resonance imaging of alginate beads containing pancreatic beta cells and paramagnetic nanoparticles
DOI:
https://doi.org/10.31224/2821Keywords:
islet encapsulation, magnetic resonance imaging, alginate beads, beta cell, paramagnetic contrast agents, mesoporous silica nanoparticlesAbstract
Microencapsulation is being investigated as a means to avoid rejection of transplanted pancreatic islets. Monitoring bead distribution and stability in vivo is an important step towards improving microencapsulated islet transplantation strategies. Islet co-encapsulation with gadolinium-labeled mesoporous silica nanoparticles (Gd-MSNs) could provide a means to visualise the beads while immobilizing and limiting the potential internalisation of the contrast agent. The porous nature of the MSNs could also be used to locally release anti inflammatory, angiogenic, or anti apoptotic factors. Mouse insulinoma 6 (MIN6) beta cells were co-encapsulated with Gd-MSNs in alginate beads produced by emulsification and internal gelation. Gd-MSN alginate beads appeared brighter in T1-w. imaging sequences (detection threshold of 0.016 mM Gd; relaxometric ratio r2/r1 = 1.45). No leaching of Gd3+ from the hydrogels was detected over the course of 3 months. Cells co-encapsulated with Gd-MSNs were viable without significant differences in cell growth rate compared to controls. This study paves the way towards microencapsulated islet tracking via MRI using co-encapsulated paramagnetic nanomaterials.
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Copyright (c) 2023 Sary Sarkis, Fanny Silencieux, Karen Markwick, Marc-André Fortin, Corinne Hoesli
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