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Related Concept Videos

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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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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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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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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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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

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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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Age matters: Grading granule secretion in beta cells.

Eleni Georgiadou1, Guy A Rutter2

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The Journal of Biological Chemistry
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Summary

Insulin granules are released from pancreatic beta cells based on their age. Younger insulin granules are preferentially secreted, supporting models of regulated insulin release.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Metabolic Research

Background:

  • Insulin is stored in secretory granules within pancreatic islet beta cells for rapid release.
  • The mechanisms governing the prioritization of specific insulin granules for secretion are not fully understood.
  • Understanding granule dynamics is crucial for regulating blood glucose levels.

Purpose of the Study:

  • To investigate the relationship between insulin granule age and secretion.
  • To develop a method for assessing insulin secretion as a function of granule age.
  • To provide quantitative evidence for age-dependent insulin granule release.

Main Methods:

  • Utilized a fluorescent timer to label insulin granules based on their age.
  • Employed flow cytometry-assisted organelle sorting (FACS) to isolate and analyze granules.
  • Assessed insulin secretion rates in relation to granule age in pancreatic islet beta cells.

Main Results:

  • Developed an innovative approach to measure insulin secretion from distinct granule age pools.
  • Provided quantitative data demonstrating that younger insulin granules are released preferentially.
  • Confirmed that insulin secretion is an age-dependent process.

Conclusions:

  • Insulin granule release from pancreatic beta cells is not random but age-dependent.
  • Younger insulin granules are prioritized for secretion, supporting existing models.
  • This study offers new insights into the regulation of insulin secretion and glucose homeostasis.