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The role of tumour suppressor PDCD4 in beta cell death in hypoxia

Sandeep Kumar1, Claire E Marriott1, Nouf F Alhasawi1

  • 1Diabetes Research Group, School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, United Kingdom.

Plos One
|July 28, 2017
PubMed
Abstract

Insights

Hypoxia significantly reduces pancreatic beta cell viability and induces apoptosis. Increased expression of Programmed Cell Death Gene 4 (PDCD4) under hypoxia suggests its role in beta cell death during stress.

Area of Science:

  • Endocrinology
  • Cell Biology
  • Molecular Biology

Background:

  • Hypoxia impairs pancreatic beta cell function and survival.
  • Programmed Cell Death Gene 4 (PDCD4) is implicated in beta cell neogenesis and function.

Purpose of the Study:

  • To investigate the impact of hypoxia on beta cell viability.
  • To examine changes in PDCD4 expression and localization under hypoxic conditions.

Main Methods:

  • MIN6 beta cells and ARIP ductal cells were exposed to hypoxic (1% O2) or normoxic (21% O2) conditions for 12-24 hours.
  • Assays included MTT, HPI staining, SEM, western blotting, and immunocytochemistry.

Main Results:

  • Hypoxia caused ~70% loss in beta cell viability and induced apoptosis/necrosis.
  • ARIP cells showed hypoxia-induced apoptosis but no significant growth change.
  • PDCD4 expression increased in both beta and ductal cells under hypoxia, localized to the cytoplasm.

Conclusions:

  • Hypoxia-induced PDCD4 expression correlates with increased beta cell death.
  • PDCD4 may play a crucial role in regulating beta cell survival under hypoxic stress.

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