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Carbohydrate Metabolism01:36

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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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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 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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The therapy for diabetes aims to alleviate hyperglycemia-related symptoms, prevent acute metabolic decompensation, and reduce chronic end-organ complications. Glycemic control is evaluated through short-term (self-monitoring, continuous glucose monitoring) and long-term (A1c, fructosamine) metrics, enabling near real-time tracking of blood glucose levels and reflecting glycemic control over specific time frames.
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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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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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Interventions to improve β-cell mass and function.

Prosenjit Mondal1, Amit Prasad1, Khyati Girdhar1

  • 1School of Basic Sciences, BioX, Indian Institute of Technology, Mandi, HP 175005, India.

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Summary
This summary is machine-generated.

Type 2 Diabetes Mellitus (T2DM) involves insulin resistance and beta-cell dysfunction. Understanding beta-cell plasticity is key to developing new therapies for this widespread metabolic disease.

Keywords:
Beta-cell massCellules β pancréatiquesDiabète de type 2Insulin secretionMasse de cellules βPancreatic β-cellSécrétion d’insulineType 2 diabetes

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Area of Science:

  • Endocrinology
  • Metabolic Diseases
  • Cell Biology

Background:

  • Type 2 Diabetes Mellitus (T2DM) is a global health concern with high morbidity and healthcare costs.
  • T2DM is characterized by insulin resistance and pancreatic beta-cell dysfunction.
  • Maintaining euglycemia in T2DM requires increased beta-cell mass and insulin secretion.

Purpose of the Study:

  • To investigate the complex mechanisms coordinating beta-cell anatomical and functional plasticity in T2DM.
  • To identify novel pathways influencing beta-cell proliferation and insulin secretion.
  • To explore potential new therapeutic targets for T2DM prevention and treatment.

Main Methods:

  • The study focuses on understanding the physiological and pathophysiological regulation of beta-cell function.
  • Research involves investigating pathways that control beta-cell proliferation and insulin secretion.
  • The approach aims to uncover mechanisms underlying beta-cell adaptation and dysfunction.

Main Results:

  • The coordination of beta-cell plasticity in T2DM remains poorly understood.
  • Existing beta-cell mass compensates for insulin resistance through enhanced secretion.
  • Subsequent increases in beta-cell mass provide additional insulin secretion.

Conclusions:

  • Further research into beta-cell physiology is crucial for T2DM management.
  • Identifying novel pathways offers potential for new therapeutic strategies.
  • Understanding beta-cell plasticity may lead to interventions for preventing or delaying T2DM onset.