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Coculture Analysis of Extracellular Protein Interactions Affecting Insulin Secretion by Pancreatic Beta Cells
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The Tetracycline-Controlled Transactivator (Tet-On/Off) System in β-Cells Reduces Insulin Expression and Secretion in

Nathalie Jouvet1, Khalil Bouyakdan2, Scott A Campbell2,3

  • 1Institut de recherches cliniques de Montréal (IRCM), Montréal, Quebec, Canada nathalie.jouvet@ircm.qc.ca jennifer.estall@ircm.qc.ca.

Diabetes
|October 6, 2021
PubMed

Insights

Tetracycline-controlled transactivator expression in pancreatic beta cells disrupts insulin gene expression and secretion, regardless of system activation. This highlights challenges in genetic manipulation of beta cells using Tet-On/Tet-Off systems.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Controllable genetic manipulation is crucial for cell biology research.
  • Challenges in beta-cell research include transgene silencing and off-target effects.

Purpose of the Study:

  • To investigate if a Tetracycline (Tet)-Off system with a beta-cell-specific promoter could improve genetic manipulation in beta cells.
  • To assess the impact of Tet-On/Tet-Off systems on beta-cell function and insulin regulation.

Main Methods:

  • Utilized a Tet-Off system with mouse insulin promoter (MIP)-driven expression of tetracycline operon (TetO)-Cre in mice.
  • Evaluated tissue-specific gene recombination, beta-cell architecture, glucose-stimulated insulin secretion (in vitro and in vivo), and glucose homeostasis.

Main Results:

  • Expression of tetracycline-controlled transactivators (tTA, rtTA) in beta cells significantly reduced Insulin gene expression and insulin content.
  • Pancreatic insulin levels and insulin secretion were decreased in mice with tTA transgenes, irrespective of Cre or doxycycline.
  • Beta-cell function was impaired by the mere presence of the transactivator transgene.

Conclusions:

  • The presence of tetracycline-controlled transactivator transgenes in beta cells negatively impacts insulin production and secretion.
  • Existing Tet-On and Tet-Off systems present significant challenges for reliable genetic manipulation in beta cells.
  • Emphasizes the need for rigorous controls when employing Tet-On/Tet-Off systems in beta-cell research.

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