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Related Concept Videos

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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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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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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 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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Glucagon-like Receptor Agonists01:24

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Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Related Experiment Video

Updated: Jan 3, 2026

Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
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Cellular mechanisms governing glucose-dependent insulinotropic polypeptide secretion.

Frank Reimann1, Eleftheria Diakogiannaki1, Daryl Hodge1

  • 1Wellcome Trust/MRC Institute of Metabolic Science (IMS), University of Cambridge, United Kingdom.

Peptides
|November 23, 2019
PubMed
Summary

Glucose-dependent insulinotropic polypeptide (GIP) is a gut hormone crucial for glucose metabolism and insulin secretion. Nutrient sensing by intestinal K-cells involves specific receptors for carbohydrates, lipids, and proteins, regulating GIP release.

Keywords:
Glucose-dependent insulinotropic polypeptide (GIP)Secretion

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Last Updated: Jan 3, 2026

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Area of Science:

  • Endocrinology
  • Gastroenterology
  • Molecular Biology

Background:

  • Glucose-dependent insulinotropic polypeptide (GIP) is an incretin hormone secreted by intestinal K-cells.
  • GIP plays a vital role in glucose metabolism, insulin secretion, and postprandial lipid homeostasis.
  • K-cells in the intestinal epithelium sense nutrients to regulate GIP release.

Purpose of the Study:

  • To review the mechanisms of nutrient sensing by intestinal K-cells.
  • To elucidate the roles of specific receptors in GIP secretion.
  • To highlight the physiological importance of GIP in metabolic regulation.

Main Methods:

  • Review of in vivo, in vitro, and molecular studies.
  • Analysis of nutrient-sensing pathways in enteroendocrine K-cells.
  • Identification of key receptors involved in GIP release.

Main Results:

  • Carbohydrate sensing involves sodium-coupled glucose transporter 1 (SGLT1).
  • Lipid sensing is mediated by free-fatty acid receptors (FFAR1/FFAR4) and GPR119.
  • Protein sensing involves calcium-sensing receptor (CASR) and GPR142, modulated by somatostatin and galanin.

Conclusions:

  • Intestinal K-cells utilize diverse receptors for sensing carbohydrates, lipids, and proteins.
  • These sensing mechanisms are critical for regulating GIP secretion and its metabolic effects.
  • Understanding these pathways is key to metabolic disease research.