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Related Concept Videos

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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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: The Receptor and Signaling Pathways01:28

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Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
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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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Type I Diabetes II: Pathophysiology01:26

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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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Type II Diabetes II: Pathophysiology01:24

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PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
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Related Experiment Video

Updated: Apr 21, 2026

Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion
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Increased skeletal muscle capillarization enhances insulin sensitivity.

Thorbjorn Akerstrom1, Lasse Laub2, Kenneth Vedel2

  • 1Section of Integrative Physiology, Department of Nutrition, Exercise, and Sports, The August Krogh Centre, University of Copenhagen, Copenhagen, Denmark; takerstrom@ifi.ku.dk.

American Journal of Physiology. Endocrinology and Metabolism
|October 30, 2014
PubMed
Summary

Increased skeletal muscle capillarization enhances insulin sensitivity. This finding suggests a new approach for preventing or treating type 2 diabetes by improving blood vessel formation in muscles.

Keywords:
capillarizationinsulin sensitivitymuscle glucose uptakeskeletal muscle

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Area of Science:

  • Physiology
  • Metabolic Health
  • Vascular Biology

Background:

  • Skeletal muscle capillarization is linked to glucose metabolism.
  • A causal link between capillarization and insulin sensitivity remains unestablished.

Purpose of the Study:

  • To determine if increased skeletal muscle capillarization causally enhances insulin sensitivity.

Main Methods:

  • Skeletal muscle angiogenesis was induced in rats using prazosin.
  • Insulin sensitivity was assessed via hyperinsulinemic euglycemic clamp and 2-deoxy-D-glucose uptake.
  • Measurements were taken after prazosin clearance to isolate the effects of capillarization.

Main Results:

  • A ~20% increase in skeletal muscle capillarization was observed.
  • Whole-body insulin sensitivity rose by ~24%.
  • Insulin-stimulated glucose uptake in skeletal muscle increased by ~30%, independent of signaling pathway improvements.

Conclusions:

  • Increased skeletal muscle capillarization directly improves insulin sensitivity.
  • Enhanced muscle glucose uptake may result from improved glucose diffusion.
  • Targeting skeletal muscle capillarization offers potential for type 2 diabetes prevention and treatment.