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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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Feedback Loops

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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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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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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.
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
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Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

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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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Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

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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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Related Experiment Video

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Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
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Interorgan Crosstalk Contributing to β-Cell Dysfunction.

Katsuya Tanabe1, Kikuko Amo-Shiinoki1, Masayuki Hatanaka1

  • 1Division of Endocrinology, Metabolism, Hematological Science and Therapeutics, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, Japan.

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Summary

Type 2 diabetes involves pancreatic beta-cell failure due to insulin resistance. This review explores how interorgan communication contributes to beta-cell dysfunction and loss in diabetes progression.

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Area of Science:

  • Endocrinology
  • Metabolic Diseases
  • Cell Biology

Background:

  • Type 2 diabetes mellitus (T2DM) is characterized by pancreatic beta-cell failure and insulin resistance.
  • Initially, beta-cells compensate by increasing insulin secretion and mass, but this response wanes as T2DM progresses.

Purpose of the Study:

  • To review current knowledge on interorgan communications influencing beta-cell dysfunction in T2DM.
  • To highlight the roles of extrinsic signals and intrinsic beta-cell mediators in disease progression.

Main Methods:

  • Literature review of studies on T2DM pathophysiology.
  • Analysis of research on interorgan signaling pathways affecting beta-cells.

Main Results:

  • Beta-cell failure in T2DM involves impaired insulin secretion, reduced proliferation, and apoptosis.
  • Extrinsic factors from other organs significantly impact beta-cell function and survival.

Conclusions:

  • Interorgan communication is a critical factor in the progression of beta-cell failure in T2DM.
  • Understanding these signals is key to developing new therapeutic strategies for T2DM.