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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.
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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...
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Mitogens and the Cell Cycle02:38

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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Related Experiment Video

Updated: Jun 6, 2026

A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
09:35

A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform

Published on: July 16, 2016

HIT cells secrete β-cell mitogenic factors.

B Bréant1, A Lieuvin, C Lavergne

  • 1INSERM U55, Hôpital Saint-Antoine, 184 rue du Faubourg Saint-Antoine, 75 571, Paris Cedex 12, France.

Endocrine
|December 15, 2010
PubMed
Summary
This summary is machine-generated.

Insulin-producing HIT cells exhibit unique growth patterns, resisting serum withdrawal and secreting growth factors. These findings offer insights into beta cell growth regulation.

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Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes
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Area of Science:

  • Cell Biology
  • Endocrinology
  • Molecular Biology

Background:

  • Insulin-producing HIT cells are a model for studying beta cell function.
  • Understanding beta cell growth regulation is crucial for diabetes research.

Purpose of the Study:

  • To investigate the growth characteristics of HIT cells.
  • To identify factors regulating beta cell proliferation.

Main Methods:

  • Cell culture under varying serum conditions.
  • Cytofluorometric analysis for cell cycle phase distribution.
  • Gene expression analysis (c-fos, c-jun) following suramin treatment.
  • Chromatographic separation of conditioned medium to isolate mitogenic factors.

Main Results:

  • HIT cells did not undergo growth arrest in serum-free medium.
  • A significant proportion of HIT cells remained in the S phase, even without serum.
  • Suramin treatment induced transient c-fos and c-jun expression.
  • HIT cells secreted novel mitogenic factors, distinct from IGF-I/II, that stimulated other cell types.

Conclusions:

  • HIT cells possess distinct self-regulatory growth properties compared to other beta cell lines.
  • The secreted mitogenic factors play a role in beta cell growth and proliferation.
  • Further research into these factors can elucidate beta cell growth mechanisms.