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Related Concept Videos

Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

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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

Type II Diabetes II: Pathophysiology

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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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Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
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Type II Diabetes I: Introduction01:26

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Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
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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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Type I Diabetes I: Introduction01:12

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Type 1 diabetes mellitus is a chronic metabolic disorder characterized by an absolute deficiency of insulin resulting from the autoimmune destruction of pancreatic β-cells. Although it can occur at any age, it is most commonly diagnosed in childhood, adolescence, or early adulthood. The loss of insulin production impairs cellular glucose uptake, resulting in persistent hyperglycemia and necessitating lifelong insulin therapy.Autoimmune Destruction of β-CellsThe hallmark of type 1...
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Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
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High-density lipoprotein, beta cells, and diabetes .

Arnold von Eckardstein1, Christian Widmann2

  • 1Institute of Clinical Chemistry, University Hospital Zurich, Zurich, Switzerland.

Cardiovascular Research
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PubMed
Summary

High-density lipoproteins (HDL) protect pancreatic beta cells from stress-induced death and improve insulin secretion, suggesting HDL's importance in preventing diabetes.

Keywords:
ApoptosisDiabetesER stressHDLsPancreatic beta cellsProtective signalsSignalling

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Area of Science:

  • Endocrinology
  • Metabolic Research
  • Cell Biology

Background:

  • High-density lipoproteins (HDL) offer protective effects on various cell types, including anti-atherogenic actions.
  • HDLs demonstrate anti-diabetogenic functions in pancreatic beta cells, inhibiting stress-induced cell death.
  • HDL-cholesterol levels inversely correlate with diabetes risk, highlighting HDL's role in metabolic health.

Purpose of the Study:

  • To review the beneficial effects of HDLs on pancreatic beta cells.
  • To elucidate the mechanisms underlying HDL's actions on beta cells.
  • To identify knowledge gaps in HDL signaling pathways within beta cells.

Main Methods:

  • Review of existing literature on HDL function in pancreatic beta cells.
  • Discussion of HDL's modulation of endoplasmic reticulum stress.
  • Analysis of HDL's impact on glucose-stimulated insulin secretion and glucose uptake.

Main Results:

  • HDLs inhibit stress-induced cell death in pancreatic beta cells.
  • HDLs enhance glucose-stimulated insulin secretion.
  • HDLs stimulate glucose uptake in skeletal muscle, adipose tissue, and liver.

Conclusions:

  • Maintaining appropriate HDL levels and functionality is crucial for diminishing diabetes risk.
  • Further research into HDL signaling pathways in beta cells is needed.
  • Understanding these pathways can inform the development of therapeutic strategies for preserving beta cell function.