Islet Spheroid Model
Islet Spheroid Model - Related Videos
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In this video, we describe a procedure to infuse pancreatic islet cells into the hepatic portal vein, followed by application of gel foam to successfully prevent bleeding. Postoperative bleeding is a common cause of high mortality during islet transplantation.
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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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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.
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Pancreatic Islets Isolation through Collagenase Perfusion: An Enzymatic Method to Isolate Pancreatic Islet Cells
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2023
Pancreatic islets, also called the Islets of Langerhans, are a cluster of endocrine cells which produces hormones for glucose regulation and other important biological functions. This protocol explains a method for isolating pancreatic islets by first perfusing collagenase via Ampulla of Vater to digest the exocrine pancreatic tissue and a simplified density gradient centrifugation to purify the islets from mice.
FAQs
Close contact among beta cells and other islet cells helps recreate the spatial organization found in pancreatic islets. This three-dimensional arrangement can influence how cells communicate and function compared with isolated or flatter culture arrangements. As a result, the model may produce insulin secretion responses that more closely reflect islet biology and provide a stronger context for studying beta-cell regulation.
Beta cells provide the central functional readout through insulin secretion, while other islet cells help recreate the multicellular environment of an endocrine cell cluster. Including these populations supports interactions that are absent from beta-cell-only systems. Researchers can therefore examine beta-cell function within a more representative islet context rather than interpreting secretion as an isolated cellular behavior.
The main difference is the three-dimensional organization of aggregated cells. Conventional two-dimensional cultures provide less opportunity to reproduce the spatial relationships present within an intact islet, whereas spheroids promote closer cell-cell contact and tissue-like organization. This distinction matters when researchers evaluate glucose-stimulated insulin release, because the three-dimensional model can provide a more physiologically relevant functional response.
Researchers form spheroids by aggregating primary beta cells or stem cell-derived beta cells with other islet cells. The resulting cell clusters are then used as an in vitro system for examining organization and function. This approach allows investigators to select different beta-cell sources while preserving a multicellular setting relevant to pancreatic islet biology.
The model provides a three-dimensional setting in which researchers can examine insulin secretion in response to glucose. Measuring this response helps assess beta-cell function under conditions that better represent organized islet tissue than conventional two-dimensional culture. Comparisons of secretion can also reveal functional differences associated with diabetes-related dysfunction or with experimental treatments.
They are useful for investigating diabetes-related impairment of beta-cell function and for evaluating candidate treatments that may alter islet performance. Because spheroids can incorporate primary or stem cell-derived beta cells, they also support research on cell replacement strategies. Their organized, multicellular format provides relevant biological context for efforts to improve regenerative medicine approaches.