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Related Concept Videos

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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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The pancreas, a vital organ within the abdominal cavity, plays dual roles in the digestive and endocrine systems, collaborating with exocrine and endocrine cells to maintain optimal digestion and blood sugar levels.
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Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular...
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Hormones Regulating Blood Glucose01:16

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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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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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Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
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Related Experiment Video

Updated: May 3, 2026

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
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Pancreatic Islet Cell Crosstalk: Insight Into α-/β-Cell Compensatory Mechanisms.

Štěpánka Benáková1, Blanka Holendová1, Jurij Dolenšek2

  • 1Department of Pancreatic Islet Research, Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.

Comprehensive Physiology
|May 2, 2026
PubMed
Summary

In prediabetes, alpha cells compensate for beta cell dysfunction by increasing glucagon and GLP-1 signaling, preserving insulin secretion through adaptive receptor engagement.

Keywords:
GCGRGLP‐1RcAMP signalingdiabetesinsulin secretionpancreatic isletparacrine signaling

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Area of Science:

  • Endocrinology
  • Metabolic Diseases
  • Cell Biology

Background:

  • Beta-cell dysfunction impairs insulin secretion, leading to prediabetes.
  • Alpha-cell paracrine signaling may play a compensatory role in maintaining beta-cell function.
  • Nox4 knockout in beta cells (Nox4βKO) causes defective insulin secretion and a prediabetic state.

Purpose of the Study:

  • To investigate the compensatory role of alpha-cell-derived glucagon and GLP-1 signaling in maintaining beta-cell function during compromised insulin secretion.
  • To analyze adaptive changes in pancreatic islets of prediabetic Nox4βKO mice.

Main Methods:

  • Immunocytochemistry, flow cytometry, RNA sequencing, cAMP assays, and hormone secretion assays.
  • Analysis of isolated islets and pancreatic slices under varying glucose and receptor-modulating conditions.
  • Detailed assessment of islet composition, hormone secretion, receptor expression, and signaling pathways.

Main Results:

  • Prediabetic Nox4βKO islets exhibit increased alpha-cell numbers, bihormonal cells, and elevated glucagon/GLP-1 production.
  • A shift in receptor engagement from GLP-1R dominance to prominent GCGR signaling in Nox4βKO islets.
  • Insulin secretion becomes reliant on glucagon potentiation of GLP-1R and cAMP pathways, with enhanced cAMP intermediates and calcium handling.

Conclusions:

  • Alpha-cell remodeling and flexible glucagon/GLP-1 receptor engagement are key compensatory mechanisms preserving insulin secretion during early beta-cell stress.
  • Context-dependent plasticity in intra-islet receptor activation demonstrates coordinated multicellular adaptation in prediabetes.
  • Targeting intra-islet endocrine crosstalk may preserve beta-cell function in prediabetes.