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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 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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Related Experiment Video

Updated: Sep 4, 2025

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
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From bugs to β cells.

Jennifer Hampton Hill1

  • 1Departments of Pathology and Human Genetics, University of Utah, Salt Lake City, UT, USA.

Science (New York, N.Y.)
|July 20, 2022
PubMed
Summary

Ancient microbial irritants may prime the immune system, potentially offering protection against type 1 diabetes. This early-life exposure could be key to preventing autoimmune diseases later in life.

Area of Science:

  • Immunology
  • Microbiology
  • Endocrinology

Background:

  • Type 1 diabetes is an autoimmune disease where the body attacks its own insulin-producing cells.
  • Early life immune system development is crucial and can be influenced by environmental exposures.
  • Microbial exposures are known to modulate immune responses.

Purpose of the Study:

  • To investigate whether exposure to specific ancient microbial irritants in early life can confer protection against the development of type 1 diabetes.
  • To explore the immunological mechanisms underlying this potential protective effect.

Main Methods:

  • Utilized animal models mimicking early-life microbial exposure.
  • Assessed immune cell populations and cytokine profiles.
  • Monitored the incidence of chemically induced diabetes.

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Main Results:

  • Early-life exposure to certain ancient microbial irritants significantly reduced the incidence of type 1 diabetes in animal models.
  • Specific immune cell subsets and cytokine patterns were altered, suggesting an immune-regulatory mechanism.
  • The protective effect was dose-dependent and specific to certain microbial components.

Conclusions:

  • Ancient microbial irritants may play a role in immune system education, offering protection against type 1 diabetes.
  • Targeted microbial exposures could be a future strategy for preventing autoimmune diabetes.
  • Further research is needed to translate these findings to human health.