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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
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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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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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Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
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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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Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
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Circulating Sphingolipids and Glucose Homeostasis: An Update.

Sarah Ali-Berrada1,2, Jeanne Guitton3, Sophie Tan-Chen1,2

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Circulating sphingolipids like ceramides and sphingosine-1-phosphate (S1P) are linked to obesity and metabolic disorders. These lipids may act as biomarkers and mediators in glucose metabolism dysregulation.

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Area of Science:

  • Biochemistry
  • Metabolic disease research
  • Lipidomics

Background:

  • Sphingolipids are key membrane components involved in cellular processes.
  • Obesity links sphingolipids to inflammation, apoptosis, and insulin resistance.
  • Ceramides and sphingosine-1-phosphate (S1P) are circulating sphingolipids altered in metabolic disorders.

Purpose of the Study:

  • To review molecular mechanisms of ceramide and S1P regulation.
  • To explore how circulating sphingolipids mediate glucose metabolism changes.
  • To highlight sphingolipids as potential biomarkers and mediators in metabolic diseases.

Main Methods:

  • Literature review of molecular mechanisms.
  • Analysis of sphingolipid association with lipoproteins and extracellular vesicles.
  • Discussion of sphingolipid impact on glucose homeostasis.

Main Results:

  • Sphingolipids, particularly ceramides and S1P, are implicated in metabolic dysregulation.
  • Circulating sphingolipids are associated with lipoproteins and extracellular vesicles.
  • These lipids may serve as both predictive biomarkers and active mediators of glucose metabolism alterations.

Conclusions:

  • Sphingolipids play a dual role in metabolic diseases as biomarkers and mediators.
  • Understanding ceramide and S1P regulation is crucial for metabolic health.
  • Targeting sphingolipid pathways could offer therapeutic strategies for glucose metabolism disorders.