Regulation of Blood Glucose Using Islets Encapsulated in a Melanin-Modified Immune-Shielding Hydrogel
Blood Glucose
Melanins
0301 basic medicine
0303 health sciences
Tissue Scaffolds
Islets of Langerhans Transplantation
Biocompatible Materials
Hydrogels
Cells, Immobilized
Cell Line
Diabetes Mellitus, Experimental
3. Good health
Mice, Inbred C57BL
Islets of Langerhans
Mice
03 medical and health sciences
Diabetes Mellitus, Type 1
Insulin Secretion
Human Umbilical Vein Endothelial Cells
Animals
Humans
DOI:
10.1021/acsami.0c23010
Publication Date:
2021-03-10T19:31:50Z
AUTHORS (10)
ABSTRACT
Islet transplantation is currently a promising treatment for type 1 diabetes mellitus. However, the foreign body reaction and retrieval difficulty often lead to transplantation failure and hinder the clinical application. To address these two challenges, we propose a balanced charged sodium alginate-polyethyleneimine-melanin (SA-PEI-Melanin) threadlike hydrogel with immune shielding and retrievable properties. The attractiveness of this study lies in that the introduction of melanin can stimulate insulin secretion, especially under near-infrared (NIR) irradiation. After demonstrating a good immune-shielding effect, we performed an in vivo transplantation experiment. The results showed that the blood glucose level in the SA-PEI-Melanin group was stably controlled below the diabetic blood glucose criterion, and this blood glucose level could be further adjusted after NIR irradiation. In addition, the evaluation after retrieving the SA-PEI-Melanin hydrogel indicated that the islets still maintained a normal physiological function, further proving its excellent immunological protection. This study provides a new approach for the accurate regulation of blood glucose in patients with type 1 diabetes mellitus and contributes to developing a promising transplant system to reconcile real-time and precise light-defined insulin secretion regulation.
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