Human Islet Grafting
Human Islet Grafting - Related Videos
03:33
Grafting Pancreatic Islets: A Method to Implant Pancreatic Islets into the Anterior Chamber of the Mouse Eye for In Vivo Imaging
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2023
This video describes the protocol for grafting human pancreatic islets into the anterior chamber of the mouse’s eye to monitor revascularization of human islet grafts in vivo. It also helps to understand the contribution of recipient versus donor cells in promoting the encapsulation and vascularization of the graft.
06:09
Detection of Human Islet Autoantibodies Using an Electrochemiluminescence Assay
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2025
This video showcases the electrochemiluminescence detection of islet autoantibodies in human serum. The antibodies in the serum bridge the ruthenium-conjugated antigen to the biotinylated capture antigen, forming complexes that are detected by electrochemiluminescence measurements.
08:35
Human Pancreatic Islet Isolation: Part II: Purification and Culture of Human Islets
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Cited by 27 •
2009
Achieving high quality and appropriate quantity of human islets is one of the prominent prerequisites for successful islet transplantation. In this video, we describe step by step the procedures for human pancreatic islet isolation (part II: purification and culture of human islets) using a modified automated method.
03:35
A Technique for Human Skin Grafting in a Mouse Model
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2025
This video demonstrates a method for grafting human skin onto an immunodeficient mouse with a suppressed neutrophil response. The method involves applying human split-thickness skin to the mouse's graft bed, sealing it, and covering it for recovery. Eventually, the human skin adheres to the mouse's skin, establishing vascularization and circulation, resulting in a successful skin xenograft.
09:41
Confocal Imaging of Neuropeptide Y-pHluorin: A Technique to Visualize Insulin Granule Exocytosis in Intact Murine and Human Islets
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Cited by 12 •
2017
We describe a protocol for visualization of insulin exocytosis in intact islets using pHluorin, a pH-sensitive green fluorescent protein. Isolated islets are infected with adenovirus encoding pHluorin coupled to the vesicle cargo neuropeptide Y. This allows for the detection of insulin granule fusion events by confocal microscopy.
FAQs
A new blood supply is essential because implanted islets must receive nutrients and detect circulating glucose efficiently. Adequate vascularization supports the graft’s survival and allows its endocrine cells to respond to changing glucose concentrations with appropriately regulated hormone release. Poor vascular development can therefore limit graft function even when the transplanted islets remain present.
Glucose sensing links changing blood glucose concentrations to hormone secretion, particularly insulin release. Coordinated activity among the graft’s endocrine cells allows regulation rather than simple, constant hormone production. This functional integration matters because the therapeutic goal is improved glucose control, so graft assessment must consider physiological responsiveness as well as islet survival.
The recipient’s immune response can damage or eliminate transplanted islets, reducing the number of functioning endocrine cells. For this reason, protection from immune-mediated rejection is a central research concern alongside vascularization and survival. Immunosuppressive strategies are investigated to preserve graft activity, although the need for such protection makes long-term management and monitoring important.
Sustained benefit depends on several connected requirements: the islets must survive, establish an adequate blood supply, sense glucose changes, and release hormones appropriately. Immune-mediated injury can disrupt these processes and reduce performance. Monitoring is therefore important for evaluating whether the graft remains functional and for understanding how vascularization, immune protection, and endocrine responsiveness influence outcomes.
After implantation, the graft must become an active endocrine unit within the recipient. The essential post-implantation objectives are establishment of a blood supply, preservation of islet survival, glucose-responsive hormone release, and protection against immune-mediated rejection. Clinical and research procedures consequently emphasize graft monitoring and strategies intended to support these conditions over time.
The approach is primarily investigated for people with type 1 diabetes who experience severe hypoglycemia or impaired glucose regulation. In this setting, restoring regulated endocrine activity may address a major difficulty in maintaining blood glucose control. Its relevance is greatest when researchers can preserve graft survival, support vascularization, and limit immune-mediated damage after transplantation.
Researchers can assess whether the graft survives, develops an adequate blood supply, senses glucose, and releases insulin and other hormones appropriately. They can also examine the degree of glucose regulation achieved and whether immune-mediated rejection threatens function. These outcomes help distinguish an anatomically persistent graft from one that operates effectively as an endocrine unit.