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Gene expression patterns in synchronized islet populations.

Nikita Mukhitov1, Joel E Adablah1, Michael G Roper1

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Synchronized pancreatic islets exhibit coordinated calcium oscillations, impacting gene expression. This synchronization reduces protein synthesis and energy use while enhancing cell structure maintenance.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Systems Biology

Background:

  • In vivo insulin levels oscillate due to synchronized pancreatic islets of Langerhans.
  • Coordinated intracellular factors, like calcium (Ca2+), are expected results of islet synchronization.
  • Oscillatory intracellular signals can influence gene expression in various cell types.

Purpose of the Study:

  • To investigate differences in gene expression between synchronized and unsynchronized islet populations.
  • To determine the effect of synchronized intracellular calcium oscillations on islet gene expression.

Main Methods:

  • Utilized gene set enrichment analysis (GSEA) to compare gene expression profiles.
  • Synchronized islet populations using a glucose wave with a 5-minute period.
  • Measured intracellular Ca2+ oscillations and their period and drift.

Main Results:

  • Synchronized islets (58/62) showed coordinated Ca2+ oscillations (5.1 min period) compared to unsynchronized islets (29/62, 5.2 min period).
  • Synchronized islets exhibited less oscillation period drift.
  • GSEA revealed reduced expression of genes for protein translation, turnover, energy expenditure, and insulin synthesis in synchronized islets.
  • Increased expression of genes related to cell morphology maintenance was observed in synchronized islets.

Conclusions:

  • Islet synchronization through coordinated Ca2+ oscillations alters the cellular gene expression landscape.
  • Synchronization leads to decreased metabolic activity and protein synthesis, favoring cell structure maintenance.