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The toxic effects of microcystin-LR on rat spermatogonia in vitro

Yuan Zhou1, Jintao Yuan, Jiang Wu

  • 1Medical School, Nanjing University, Nanjing, Jiangsu 210093, PR China.

Toxicology Letters
|May 15, 2012
PubMed

Insights

Microcystin-leucine arginine (MC-LR) enters spermatogonia, causing reproductive toxicity. This cyanotoxin exposure increases cell damage and apoptosis, highlighting risks to male reproductive health.

Area of Science:

  • Environmental Toxicology
  • Reproductive Biology
  • Cellular Toxicology

Background:

  • Bloom-forming cyanobacteria produce microcystin-leucine arginine (MC-LR), a cyclic heptapeptide with known reproductive toxicity.
  • Understanding MC-LR's impact on male germ cells is crucial for assessing reproductive health risks.

Purpose of the Study:

  • To determine if MC-LR can enter spermatogonia.
  • To investigate the in vitro toxic effects of MC-LR on spermatogonia.
  • To screen for multispecific organic anion-transporting polypeptides (Oatps) involved in MC transport.

Main Methods:

  • Spermatogonia were exposed to varying concentrations of MC-LR (0-500 nM) for 6 hours.
  • Assessed cell viability, total antioxidant capacity, apoptosis, reactive oxidative species (ROS), mitochondrial membrane potential (MMP), and intracellular free Ca²⁺.
  • Screened for Oatp mRNA expression in spermatogonia and evaluated MC-LR's effect on their expression.

Main Results:

  • MC-LR was found to immigrate into spermatogonia.
  • Exposure to 5 nM and higher MC-LR concentrations significantly decreased cell viability and antioxidant capacity.
  • Increased apoptosis, ROS production, altered MMP, and elevated intracellular Ca²⁺ were observed at higher MC-LR concentrations.
  • At least five Oatps (Oatp1a5, -3a1, -6b1, -6c1, -6d1) were detected, with MC-LR affecting their expression, particularly Oatp3a1.

Conclusions:

  • MC-LR can be transported into spermatogonia.
  • MC-LR induces cytotoxicity in spermatogonia through oxidative stress and apoptosis.
  • Oatps play a role in MC-LR uptake by spermatogonia, with Oatp3a1 being notably affected.

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