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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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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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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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Insulin: Biosynthesis, Chemistry, and Preparation01:25

Insulin: Biosynthesis, Chemistry, and Preparation

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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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Confocal Laser Scanning Microscopy of Calcium Dynamics in Acute Mouse Pancreatic Tissue Slices
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GABA signalling in human pancreatic islets.

Zhe Jin1, Sergiy V Korol1

  • 1Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden.

Frontiers in Endocrinology
|March 9, 2023
PubMed
Summary

Gamma-aminobutyric acid (GABA) influences pancreatic islet function and cell communication. Research explores GABA signaling in islets for potential type 1 diabetes treatments.

Keywords:
GABA toleranceGABAA receptorT1D mouse modelblood glucosediabetes mellitusinsulin secretionmixed-identity cellβ cell

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Area of Science:

  • Endocrinology
  • Neuroscience
  • Immunology

Background:

  • Pancreatic islets regulate blood glucose via cell communication.
  • Gamma-aminobutyric acid (GABA) is an islet signaling molecule affecting hormone secretion.
  • GABA influences immune cell interactions with islet cells, relevant to type 1 diabetes.

Purpose of the Study:

  • To review the current understanding of GABA signaling in human pancreatic islets.
  • To identify knowledge gaps in islet GABA research.
  • To explore potential clinical implications of GABA signaling in islets.

Main Methods:

  • Literature review of physiological and pathological studies on islet GABA.
  • Analysis of molecular, cellular, and clinical data.
  • Focus on human islet research.

Main Results:

  • GABA plays a significant role in islet cell communication and function.
  • GABA signaling impacts islet-immune cell interactions.
  • Growing research interest spans fundamental to clinical aspects.

Conclusions:

  • GABA is a key molecule in pancreatic islet physiology and pathology.
  • Further research is needed to fully elucidate GABA's role and clinical potential in diabetes.
  • GABA signaling in islets holds promise for future therapeutic strategies.