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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 preparations are categorized by their duration of action into short-acting and long-acting types. Two strategies are used to modify insulin's absorption and pharmacokinetic profile: slowing the absorption post-subcutaneous injection, or altering human insulin's amino acid sequence or protein structure. These changes retain the insulin's ability to bind to the insulin receptor, but alter its behavior in solution or after injection.
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Fast Fourier Transform01:10

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The Fast Fourier Transform (FFT) is a computational algorithm designed to compute the Discrete Fourier Transform (DFT) efficiently. By breaking down the calculations into smaller, manageable sections, the FFT significantly reduces the computational complexity involved. Direct computation of an N-point DFT requires N2 complex multiplications, whereas the FFT algorithm needs only (N/2)log⁡2N multiplications, offering a much faster performance.
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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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Measuring Relative Insulin Secretion using a Co-Secreted Luciferase Surrogate
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Optimized fasting and OGTT-based simple surrogate methods for assessing insulin sensitivity.

Miguel Altuve1, Erika Severeyn2, Sara Wong3

  • 1Faculty of Electrical and Electronic Engineering, Pontifical Bolivarian University, Bucaramanga, Colombia.

Diabetes & Metabolic Syndrome
|August 14, 2019
PubMed
Summary
This summary is machine-generated.

New simple indices estimate insulin sensitivity using fasting or oral glucose tolerance test (OGTT) data. The OGTT-based index shows better accuracy and reduced variability compared to fasting measures, offering a practical alternative to complex clamp methods.

Keywords:
Evolutionary algorithmInsulin sensitivityMetabolic syndromeOral glucose tolerance testStatistical analysis

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Area of Science:

  • Metabolic Research
  • Endocrinology
  • Biomedical Engineering

Background:

  • Insulin sensitivity assessment is crucial for metabolic health.
  • Hyperinsulinemic-euglycemic clamp is accurate but complex and costly.
  • Existing surrogate indices exhibit population-specific variabilities.

Purpose of the Study:

  • Develop and validate simple surrogate indices for insulin sensitivity.
  • Improve upon existing indices by reducing intergroup variability.
  • Compare fasting and oral glucose tolerance test (OGTT) based indices.

Main Methods:

  • Integrated anthropometric measures with glucose and insulin values.
  • Utilized evolutionary algorithms for index optimization.
  • Validated against the Stumvoll MCR method across diverse populations.

Main Results:

  • Achieved reduced intergroup variability in insulin sensitivity estimates.
  • The OGTT-based index demonstrated stronger correlations with the Stumvoll method.
  • Fasting-based index also showed reduced variability, but less effectively than the OGTT index.

Conclusions:

  • Proposed indices offer a simpler, more accessible alternative for insulin sensitivity measurement.
  • The OGTT-based index is superior due to its comprehensive assessment of glucose metabolism and insulin action.
  • These indices have potential for widespread clinical and research application.