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Related Concept Videos

Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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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.
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Updated: Dec 24, 2025

Surface Engineering of Pancreatic Islets with a Heparinized StarPEG Nanocoating
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Islet encapsulation.

Alexander Ulrich Ernst1, Long-Hai Wang, Minglin Ma

  • 1Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA. mm826@cornell.edu.

Journal of Materials Chemistry. B
|April 8, 2020
PubMed
Summary
This summary is machine-generated.

Islet encapsulation offers a promising solution for type 1 diabetes mellitus (T1DM) by creating a barrier to protect transplanted cells. Engineering advances are nearing clinical application, but challenges remain for widespread patient use.

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Diabetes Treatment

Background:

  • Type 1 diabetes mellitus (T1DM) is treated with islet transplantation, but donor shortages and immunosuppression limit efficacy.
  • Islet encapsulation technology aims to overcome these limitations by creating a protective barrier for transplanted cells.
  • Current challenges hinder the clinical translation of islet encapsulation for T1DM patients.

Purpose of the Study:

  • To review recent engineering advances in islet encapsulation technologies for β cell replacement therapy.
  • To identify outstanding challenges in translating islet encapsulation to clinical application for T1DM.
  • To provide an overview of the current state and future directions of islet encapsulation research.

Main Methods:

  • Comprehensive literature review of recent engineering advances in islet encapsulation.
  • Analysis of current challenges and translational hurdles in the field.
  • Synthesis of research findings to identify key areas for future development.

Main Results:

  • Significant engineering progress has been made in developing islet encapsulation systems.
  • Key translational hurdles are nearing resolution, suggesting potential for clinical application.
  • Several challenges persist, including biocompatibility, long-term function, and immune response modulation.

Conclusions:

  • Islet encapsulation holds significant promise for improving T1DM treatment by eliminating the need for immunosuppression and addressing donor shortages.
  • Continued engineering innovation and rigorous preclinical/clinical evaluation are crucial for successful translation.
  • Overcoming remaining challenges will enable broader application of β cell replacement therapy for a wider patient population.