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Related Concept Videos

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

3.1K
The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
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Glucagon-like Receptor Agonists01:24

Glucagon-like Receptor Agonists

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Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by...
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Related Experiment Video

Updated: Apr 2, 2026

Generation of Alginate Microspheres for Biomedical Applications
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Long-Term Function of Alginate-Encapsulated Islets.

Melanie Köllmer1, Alyssa A Appel1,2, Sami I Somo1,2

  • 11 Department of Biomedical Engineering, Illinois Institute of Technology , Chicago, Illinois.

Tissue Engineering. Part B, Reviews
|September 29, 2015
PubMed
Summary
This summary is machine-generated.

Alginate-encapsulated islet cells show promise for type 1 diabetes treatment. Optimizing capsule stability and biocompatibility is crucial for long-term graft survival and metabolic benefits.

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Area of Science:

  • Biomaterials Science
  • Transplantation Immunology
  • Endocrinology

Background:

  • Alginate-encapsulated islet cells are a potential therapy for type 1 diabetes, offering immune protection.
  • Long-term success depends on the stability and immunoprotective capacity of alginate microcapsules in vivo.
  • Inconsistent results in previous studies highlight challenges in graft functioning and metabolic benefits.

Purpose of the Study:

  • To review long-term outcomes of alginate-encapsulated islet transplants in animal and human studies.
  • To critically discuss mechanisms of graft failure, including biocompatibility and capsule integrity.
  • To present strategies for enhancing capsule stability and monitoring graft function.

Main Methods:

  • Review of long-term animal and human studies on alginate-encapsulated islet transplantation.
  • Analysis of factors influencing encapsulation success, such as alginate composition and cross-linking ions.
  • Discussion of graft failure mechanisms and potential improvement strategies.

Main Results:

  • Alginate encapsulation can protect islets from immune rejection, enabling viability and function post-transplantation.
  • Graft success is influenced by alginate properties, cross-linking agents, and coating layers.
  • Graft failure can result from biocompatibility issues, transplantation site problems, and loss of capsule integrity.

Conclusions:

  • Optimizing alginate encapsulation strategies is essential for sustained immunoprotection and graft function.
  • Addressing biocompatibility, transplantation site, and capsule integrity are key to improving long-term outcomes.
  • Further research into capsule stabilization and in vivo monitoring is needed for successful islet cell therapy.