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Programmed cell death 4 (PDCD4): a novel player in ethanol-mediated suppression of protein translation in primary

Madhusudhanan Narasimhan1, Marylatha Rathinam, Amanjot Riar

  • 1Department of Pharmacology and Neuroscience, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.

Alcoholism, Clinical and Experimental Research
|July 5, 2012
PubMed
Abstract

Insights

Ethanol exposure increases programmed cell death protein 4 (PDCD4), inhibiting protein synthesis in developing brains. This study reveals PDCD4 as a key mediator of ethanol-induced neurodevelopmental deficits.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • Prenatal ethanol (EtOH) exposure causes neurodevelopmental abnormalities, including microcephaly and behavioral deficits.
  • Impaired protein synthesis is implicated in ethanol-induced brain damage, but the underlying mechanisms remain unclear.
  • This study investigates the role of programmed cell death protein 4 (PDCD4), a translation repressor, in ethanol's effects.

Purpose of the Study:

  • To elucidate the mechanisms by which ethanol impairs protein synthesis during neurodevelopment.
  • To determine the involvement of programmed cell death protein 4 (PDCD4) in ethanol-induced neurotoxicity.
  • To investigate the impact of prenatal ethanol exposure on PDCD4 expression and protein synthesis in the developing brain.

Main Methods:

  • Primary cortical neurons (PCNs) were treated with ethanol (EtOH), and PDCD4 expression and protein synthesis were measured.
  • Methyl cap pull-down assays assessed the interaction between eukaryotic initiation factor 4A (eIF4A) and mRNA.
  • An in vivo rat model of prenatal ethanol exposure was used to analyze PDCD4 and eIF4A in fetal brain tissue.

Main Results:

  • Ethanol increased PDCD4 expression in a time- and dose-dependent manner, inhibiting eIF4A's association with mRNA.
  • Both ethanol and ectopic PDCD4 expression suppressed protein synthesis in PCNs; RNAi targeting PDCD4 reversed this inhibition.
  • Prenatal ethanol exposure in rats led to increased PDCD4 and reduced eIF4A association in the fetal cerebral cortex.

Conclusions:

  • Programmed cell death protein 4 (PDCD4) mediates the inhibitory effects of ethanol on protein synthesis in developing neurons.
  • PDCD4 plays a crucial role in ethanol-induced neurodevelopmental deficits.
  • These findings highlight PDCD4 as a potential therapeutic target for preventing or mitigating prenatal alcohol spectrum disorder.

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