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Pathophysiology of Diabetes

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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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Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
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Glucose Homeostasis: Regulation of Blood Glucose01:02

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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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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
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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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Maternal Exercise Improves Glucose Tolerance in Female Offspring.

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  • 1Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH.

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Summary

Maternal exercise can prevent metabolic problems in offspring caused by a poor diet. This study shows exercise during pregnancy reverses negative effects of high-fat diets on female offspring metabolism, improving glucose tolerance and liver function.

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Area of Science:

  • Reproductive Biology
  • Metabolic Health
  • Developmental Programming

Background:

  • Poor maternal nutrition, particularly high-fat diets, negatively impacts offspring metabolic health.
  • Maternal exercise is a potential intervention to mitigate adverse developmental programming.
  • Understanding how maternal exercise influences offspring metabolism is crucial for preventing intergenerational metabolic disease.

Purpose of the Study:

  • To determine if maternal exercise can reverse the detrimental effects of a high-fat diet on female offspring metabolism.
  • To investigate the impact of maternal exercise on glucose tolerance, insulin sensitivity, and liver function in offspring.
  • To assess the potential of maternal exercise as a strategy to combat the transmission of metabolic disorders.

Main Methods:

  • Female C57BL/6 mice were fed either a chow or high-fat diet and housed in static cages or cages with running wheels.
  • Mice underwent exercise for 2 weeks before breeding and throughout gestation.
  • Offspring metabolic parameters, including glucose tolerance, insulin levels, adiposity, and liver function, were assessed.

Main Results:

  • Female offspring of sedentary dams on a high-fat diet exhibited impaired glucose tolerance.
  • Maternal exercise normalized glucose tolerance, reduced fasting insulin, and decreased adiposity in offspring.
  • Liver metabolic function, including glucose production and triglyceride content, was improved in offspring from trained dams.

Conclusions:

  • Maternal exercise effectively negates the adverse metabolic consequences of a maternal high-fat diet in female offspring.
  • This intervention improves offspring glucose tolerance and liver metabolic function, offering a strategy to combat intergenerational metabolic disease.
  • Maternal exercise is a vital intervention for improving the metabolic health of offspring and preventing the transmission of obesity and diabetes.