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Related Concept Videos

Type II Diabetes II: Pathophysiology01:24

Type II Diabetes II: Pathophysiology

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.
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

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.
Insulin and C-peptide are co-secreted in...
Hyperglycemia01:29

Hyperglycemia

Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose levels exceed 180 mg/dL two...
Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

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 uptake of...
Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

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.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...
Type I Diabetes III: Clinical Manifestations01:19

Type I Diabetes III: Clinical Manifestations

Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the kidneys...

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Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice
07:35

Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice

Published on: January 26, 2024

β-Cell dysfunction under hyperglycemic stress: a molecular model.

Florin Despa1, R Stephen Berry

  • 1Department of Pharmacology, University of California Davis, Davis, California 95616, USA. fdespa@ucdavis.edu

Journal of Diabetes Science and Technology
|December 7, 2010
PubMed
Summary
This summary is machine-generated.

Chronic hyperglycemia causes pancreatic beta-cell endoplasmic reticulum overload, leading to misfolded proinsulin and impaired insulin conversion. Computer simulations reveal molecular crowding effects impacting beta-cell function and insulin secretion.

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Area of Science:

  • Biophysics
  • Cellular Biology
  • Computational Biology

Background:

  • Pancreatic beta cells synthesize proinsulin, the insulin precursor.
  • Chronic hyperglycemia leads to proinsulin misfolding and impaired insulin secretion.
  • Mechanisms linking endoplasmic reticulum overload to proinsulin conversion are unclear.

Purpose of the Study:

  • Investigate biophysical mechanisms of beta-cell secretory defects.
  • Elucidate the chemistry of secretory dysfunction.
  • Relate biophysical alterations to proinsulin-to-insulin conversion rates.

Main Methods:

  • Utilized molecular crowding concepts and statistical thermodynamics.
  • Employed computer simulations and numerical algorithms.
  • Analyzed alterations in the beta-cell secretory track.

Main Results:

  • Endoplasmic reticulum overload causes molecular crowding.
  • Crowding affects protein translation, including proinsulin misfolding.
  • Delayed proinsulin packing and reduced conversion rates observed.

Conclusions:

  • Enhanced understanding of beta-cell translational mechanisms under hyperglycemic stress.
  • Provides insights into how hyperglycemia alters secretory function.
  • Potential for developing clinical software for diabetic state prediction.