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Related Concept Videos

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

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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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Cells and Secretions of the Pancreas01:16

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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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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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Feedback Loops01:01

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In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
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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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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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Related Experiment Video

Updated: Jan 15, 2026

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
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Alpha-to-beta cell crosstalk: Adaptive mechanisms shaping islet function.

Philip Tröster1, Montse Visa1, Per-Olof Berggren2

  • 1The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, SE-17177, Stockholm, Sweden.

Advances in Biological Regulation
|October 9, 2025
PubMed
Summary

Pancreatic alpha and beta cell communication is vital for glucose homeostasis, especially under stress. Sex-specific adaptations in this crosstalk enhance insulin secretion in females, offering insights into diabetes resilience.

Keywords:
Alpha cell inputBeta cell functionCa(2+) dynamicsPancreatic isletParacrine signalingSex differences

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Metabolic Regulation

Background:

  • Pancreatic islets traditionally viewed as binary (alpha/beta cells) are now understood as complex paracrine networks.
  • Alpha-to-beta cell communication is crucial for maintaining islet function, particularly under metabolic stress.
  • Intra-islet crosstalk significantly influences glucose homeostasis and beta cell resilience.

Purpose of the Study:

  • To investigate the role of alpha-to-beta cell communication in metabolic stress adaptation.
  • To explore sex-dependent differences in intra-islet signaling under prediabetic conditions.
  • To elucidate the mechanisms underlying enhanced beta cell responsiveness mediated by paracrine signaling.

Main Methods:

  • Utilized Western diet-fed mice models to induce prediabetic stress.
  • Employed glucagon receptor antagonists in human islets.
  • Investigated GLP-1 receptor nanodomain dynamics at the alpha-beta junction.
  • Analyzed sex-dependent changes in islet cytoarchitecture and calcium (Ca2+) dynamics.

Main Results:

  • Prediabetic stress remodels islet architecture in a sex-dependent manner, enhancing alpha-to-beta signaling.
  • Female mice exhibited more effective insulin secretion preservation due to enhanced Ca2+ dynamics.
  • Glucagon paracrine signaling and specific GLP-1 receptor nanodomains are critical for adaptive responses.

Conclusions:

  • Intra-islet communication is a key factor in diabetes progression and adaptation.
  • Sex-specific paracrine signaling significantly impacts metabolic stress resilience.
  • Further understanding of these nuances is vital for developing targeted diabetes therapies and regenerative strategies.