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Involvement of gap junctions in propylthiouracil-induced cytotoxicity in BRL-3A cells

Nan Tang1, Ziqing Cai1, Hongpeng Chen2

  • 1School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong 523808, P.R. China.

Experimental and Therapeutic Medicine
|March 26, 2019
PubMed

Insights

Propylthiouracil (PTU) liver injury is linked to gap junctions (GJs). Blocking GJ communication or connexin-32 (Cx32) reduced PTU toxicity by lowering PTU and reactive oxygen species (ROS) levels.

Area of Science:

  • Hepatology
  • Cell Biology
  • Toxicology

Background:

  • Gap junctions (GJs) facilitate intercellular communication and are implicated in drug-induced liver injury.
  • The specific role of GJs in propylthiouracil (PTU)-induced hepatotoxicity remains largely unknown.
  • Understanding GJ involvement is crucial for mitigating PTU-related liver damage.

Purpose of the Study:

  • To investigate the influence of GJ intercellular communication on PTU-induced hepatotoxicity in rat liver cells.
  • To elucidate the underlying mechanisms by which GJs contribute to PTU toxicity.
  • To assess the protective effects of modulating GJ function against PTU-induced liver injury.

Main Methods:

  • Utilized the BRL-3A rat liver cell line for experimental manipulations.
  • Regulated GJ function through distinct experimental approaches.
  • Employed small interfering RNA (siRNA) to specifically knockdown connexin-32 (Cx32) expression.

Main Results:

  • PTU-induced cell death was significantly attenuated when GJ intercellular communication was inhibited.
  • Knockdown of Cx32 decreased necrosis, intracellular PTU accumulation, and reactive oxygen species (ROS) levels post-PTU exposure.
  • These findings indicate that GJ Cx32 plays a critical role in PTU-induced cytotoxicity.

Conclusions:

  • GJ intercellular communication mediates PTU-induced hepatotoxicity in BRL-3A cells.
  • Suppression of GJ Cx32 confers protection against PTU toxicity by reducing PTU and ROS accumulation.
  • This study provides novel insights into the mechanisms of PTU-induced liver injury involving GJs.
Keywords:
BRL-3Acytotoxicitygap junctionmechanismpropylthiouracil

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