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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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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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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 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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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

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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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Imaging Calcium Dynamics in Subpopulations of Mouse Pancreatic Islet Cells
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Calcium signalling in diabetes.

Agustin Guerrero-Hernandez1, Alexei Verkhratsky2

  • 1Department of Biochemistry, CINVESTAV-IPN, Mexico City, D.F., Mexico.

Cell Calcium
|September 14, 2014
PubMed
Summary

Cellular calcium (Ca2+) signaling regulates cell metabolism and adaptation. Impaired communication between the ER and mitochondria in diabetes disrupts Ca2+ homeostasis, leading to various complications.

Keywords:
ATP productionCa(2+) homeostasisCa(2+) signallingDiabetesER stressPathology

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Area of Science:

  • Cellular Biology
  • Physiology
  • Metabolism

Background:

  • Calcium (Ca2+) homeostasis and signaling are crucial for cellular adaptation and pathology.
  • Cellular Ca2+ levels are intrinsically linked to cell metabolism, influencing ATP production and consumption.
  • The endoplasmic reticulum (ER) and mitochondria communication is vital for metabolic fine-tuning.

Purpose of the Study:

  • To explore the role of molecular cascades in Ca2+ homeostasis and signaling.
  • To investigate the link between Ca2+ control, cell metabolism, and physiological adaptation.
  • To understand how ER-mitochondria communication impacts metabolic fine-tuning in health and disease.

Main Methods:

  • Analysis of molecular cascades involved in Ca2+ homeostasis.
  • Investigation of Ca2+ signaling pathways in cellular adaptation.
  • Examination of ER-mitochondria communication in metabolic regulation.

Main Results:

  • Ca2+ signaling pathways are plastic toolkits for cellular adaptation and pathology.
  • Disrupted ER-mitochondria communication in insulin resistance and diabetes impairs Ca2+ homeostasis.
  • This impairment leads to diverse disorders including reduced insulin production, impaired contractility, and altered glucose metabolism.

Conclusions:

  • Dysfunctional Ca2+ homeostasis due to impaired ER-mitochondria communication is central to diabetes pathogenesis.
  • These disruptions contribute to pancreatic beta cell mass reduction and diabetic complications.
  • Restoring Ca2+ signaling and ER-mitochondria communication may offer therapeutic targets for diabetes and its complications.