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Diazoxon disrupts the expression and distribution of βIII-tubulin and MAP 1B in differentiating N2a cells

Magdalini Sachana1, Erasmia Sidiropoulou, John Flaskos

  • 1Laboratory of Biochemistry and Toxicology, School of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Basic & Clinical Pharmacology & Toxicology
|January 15, 2014
PubMed

Insights

Diazoxon (DZO), an insecticide metabolite, inhibits neurite outgrowth by reducing specific microtubule proteins like βIII-tubulin and MAP 1B in neuroblastoma cells, suggesting a role in developmental neurotoxicity.

Area of Science:

  • Neuroscience
  • Toxicology
  • Cell Biology

Background:

  • Insecticide diazinon (DZ) exposure can lead to developmental neurotoxicity.
  • Diazoxon (DZO) is a primary active metabolite of diazinon.
  • Cytoskeletal proteins are crucial for neuronal development and function.

Purpose of the Study:

  • To investigate the effects of diazoxon (DZO) on key cytoskeletal proteins during neuronal differentiation.
  • To assess the impact of DZO on neurite outgrowth in N2a neuroblastoma cells.
  • To determine if DZO disrupts microtubule network formation.

Main Methods:

  • N2a neuroblastoma cells were treated with sublethal concentrations of DZO (1, 5, 10 μM).
  • Neurite outgrowth was measured.
  • Immunoblotting was used to quantify levels of β-tubulin, βIII-tubulin, polyglutamylated tubulin, MAP 1B, MAP tau, NFL, and NFM.
  • Indirect immunofluorescence visualized βIII-tubulin distribution in neurites.

Main Results:

  • Sublethal DZO concentrations (1-10 μM) significantly inhibited neurite outgrowth.
  • DZO (10 μM) reduced βIII-tubulin levels and altered its distribution in neurites.
  • DZO (10 μM) decreased the expression of microtubule-associated protein 1B (MAP 1B).
  • Total β-tubulin, polyglutamylated tubulin, MAP tau, NFL, and NFM levels remained unaffected.

Conclusions:

  • Diazoxon disrupts the microtubule network by affecting specific proteins essential for neuritogenesis.
  • The observed changes in βIII-tubulin and MAP 1B suggest a mechanism for DZO-induced neurodevelopmental toxicity.
  • DZO's impact on cytoskeletal proteins may contribute to the neurotoxic effects of diazinon exposure.

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