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Related Concept Videos

Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

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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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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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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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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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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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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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Updated: Apr 27, 2026

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
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Hepatic ABCA1 expression improves β-cell function and glucose tolerance.

Willeke de Haan1, Joanna M Karasinska1, Piers Ruddle1

  • 1Centre for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, BC, Canada.

Diabetes
|July 17, 2014
PubMed
Summary
This summary is machine-generated.

Hepatic ABCA1 protein is crucial for high-density lipoprotein (HDL) production and improves glucose tolerance by enhancing beta-cell function. Its beneficial effects diminish under metabolic stress, suggesting therapeutic potential for diabetes.

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Area of Science:

  • Biochemistry
  • Metabolic Diseases
  • Endocrinology

Background:

  • Low high-density lipoprotein (HDL) cholesterol is a risk factor for type 2 diabetes.
  • Hepatic ATP-binding cassette transporter A1 (ABCA1) is essential for HDL biogenesis.
  • Mice lacking hepatic ABCA1 exhibit significantly reduced plasma HDL levels.

Purpose of the Study:

  • To investigate the role of hepatic ABCA1 in glucose tolerance and pancreatic beta-cell function.
  • To determine the impact of hepatic ABCA1 deficiency on insulin secretion and sensitivity.
  • To explore the influence of metabolic stress on hepatic ABCA1's effects.

Main Methods:

  • Utilized mice lacking hepatic ABCA1 (ABCA1(-/-)) and wild-type (WT) littermates.
  • Assessed glucose tolerance and insulin sensitivity through glucose gavage.
  • Evaluated ex vivo insulin secretion from isolated islets and serum effects on beta-cells.
  • Administered high-fat diets to assess responses under metabolic stress.

Main Results:

  • ABCA1(-/-) mice displayed impaired glucose tolerance but normal insulin sensitivity.
  • Glucose-stimulated insulin secretion was reduced in ABCA1(-/-) mice.
  • Beta-cell function was impaired by ABCA1(-/-) serum, indicating a role for hepatic ABCA1 beyond HDL.
  • High-fat feeding negated the differences in glucose tolerance and insulin secretion between WT and ABCA1(-/-) mice.

Conclusions:

  • Hepatic ABCA1 enhances glucose tolerance by improving beta-cell function via HDL production and direct interaction.
  • The protective effects of hepatic ABCA1 are diminished under metabolic stress conditions.
  • Enhancing hepatic ABCA1 activity presents a potential therapeutic strategy for managing glucose homeostasis and diabetes.