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Human Pancreatic Islet Isolation: Part II: Purification and Culture of Human Islets
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TLR4 triggered complex inflammation in human pancreatic islets.

Wei He1, Osmond Rebello1, Rocco Savino2

  • 1University of Bremen, Center for Biomolecular Interactions Bremen, Germany.

Biochimica Et Biophysica Acta. Molecular Basis of Disease
|October 6, 2018
PubMed
Summary

Type 2 Diabetes involves inflammation via Toll-like receptor-4 (TLR-4). This pathway impairs pancreatic beta-cell function and survival, with obesity amplifying the inflammatory response and accelerating disease progression.

Keywords:
ApoptosisChemokineCytokineInflammationInsulinObesityTLR4Type 2 diabetesα-Cellsβ-Cells

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Area of Science:

  • Immunology
  • Endocrinology
  • Metabolic Diseases

Background:

  • Type 2 Diabetes (T2D) is linked to obesity and inflammation.
  • Toll-like receptor-4 (TLR-4) is a key pro-inflammatory pathway implicated in T2D.
  • The precise inflammatory mechanisms within pancreatic islets in T2D are not fully understood.

Purpose of the Study:

  • To investigate the role of TLR-4 in mediating inflammatory responses within human pancreatic islets.
  • To elucidate the impact of TLR-4 activation on beta-cell survival and function.
  • To explore how obesity influences TLR-4-mediated inflammation in pancreatic islets.

Main Methods:

  • Isolated human islets were treated with lipopolysaccharide (LPS) to activate TLR-4.
  • Cytokine production (IL-1β, IL-6, IL-8, TNF) was measured.
  • Beta-cell survival and function were assessed.
  • The effect of IL-6 antagonism and IL-8 neutralization was evaluated.
  • Comparisons were made between islets from obese and non-obese donors.

Main Results:

  • LPS-induced TLR-4 activation in human islets produced IL-1β, IL-6, IL-8, and TNF, impairing beta-cell survival and function.
  • IL-6 antagonism improved beta-cell function.
  • IL-8, produced by alpha-cells, induced monocyte migration.
  • The TLR-4 response was heightened in obese donors, showing increased cytokine expression.
  • TLR-4 activation triggered a multi-cellular inflammatory response, including beta-cell failure and macrophage recruitment.

Conclusions:

  • TLR-4 activation drives a complex inflammatory response in human islets, compromising beta-cell function and survival.
  • IL-8 plays a role in recruiting immune cells to the islets.
  • Obesity exacerbates the TLR-4 response, potentially accelerating T2D progression through enhanced beta-cell damage.