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Related Concept Videos

Insulin Secretory Vesicles01:05

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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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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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Diabetes Mellitus: Overview and Type I Subtype01:22

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Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
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Pathophysiology of Diabetes01:20

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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
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Updated: Nov 6, 2025

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Altered β-Cell Prohormone Processing and Secretion in Type 1 Diabetes.

Teresa Rodriguez-Calvo1, Yi-Chun Chen2, C Bruce Verchere3

  • 1Institute of Diabetes Research, Helmholtz Zentrum Muenchen - German Research Center for Environmental Health, Munich-Neuherberg, Germany.

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Reduced prohormone processing is an early sign in type 1 diabetes (T1D). Understanding these changes could lead to new biomarkers for personalized T1D therapies and disease endotypes.

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Area of Science:

  • Endocrinology
  • Immunology
  • Metabolic Diseases

Background:

  • Reduced islet prohormone processing is an early, persistent finding in type 1 diabetes (T1D).
  • This alteration affects insulin production and secretion in pancreatic islets.
  • Understanding these changes is crucial for T1D pathogenesis.

Purpose of the Study:

  • To review current knowledge on islet prohormone expression and processing in T1D.
  • To discuss the clinical impact of these alterations.
  • To identify future research directions.

Main Methods:

  • Review of clinical cohort data and human pancreatic tissue analyses.
  • Synthesis of existing literature on prohormone processing in T1D.
  • Identification of knowledge gaps and future research needs.

Main Results:

  • Reduced prohormone processing is consistently observed in T1D.
  • Alterations in expression and processing impact islet function.
  • The precise etiologies and consequences require further investigation.

Conclusions:

  • Altered prohormone processing may serve as a T1D biomarker.
  • This could inform personalized therapeutic strategies.
  • It may also help identify disease-specific endotypes.