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[Arrested proliferation and molecular mechanism of MAPKs' activations in manganese-treated PC12 cell line]

Wen Xu1, Jingyuan Chen, Feng Wang

  • 1Department of Occupational and Environmental Health Science, the Fourth Military Medical University, Xi'an 710032, China.

Wei Sheng Yan Jiu = Journal of Hygiene Research
|February 25, 2005
PubMed
Abstract

Insights

Manganese (Mn) exposure at high concentrations suppressed PC12 cell proliferation. This neurotoxicity involved decreased p-Erk2 and increased p-p38 mitogen-activated protein kinase (MAPK) pathway signaling.

Area of Science:

  • Neuroscience
  • Toxicology
  • Cell Biology

Context:

  • Manganese is an essential trace element, but excessive exposure can lead to neurotoxicity.
  • The PC12 cell line is a widely used model for studying neuronal function and toxicity.
  • Understanding the molecular mechanisms of manganese neurotoxicity is crucial for developing preventative and therapeutic strategies.

Purpose:

  • To investigate the in vitro dose- and time-dependent neurotoxic effects of manganese (Mn) on PC12 cells.
  • To elucidate the role of mitogen-activated protein kinase (MAPK) pathways, specifically p-Erk1/2 and p-p38, in manganese-induced neurotoxicity.

Summary:

  • PC12 cells were exposed to varying concentrations of manganese chloride (MnCl2) for up to four days.
  • MTT and clone formation assays revealed dose- and time-dependent inhibition of cell proliferation.
  • Western blot analysis showed a significant decrease in phosphorylated Erk2 (p-Erk2) and a significant increase in phosphorylated p38 (p-p38) with increasing MnCl2 exposure.

Impact:

  • The findings suggest that manganese-induced neurotoxicity in PC12 cells is associated with alterations in MAPK signaling.
  • Decreased p-Erk2 and increased p-p38 may contribute to proliferation arrest and apoptosis.
  • This study provides insights into the cellular mechanisms underlying manganese neurotoxicity, relevant for occupational health and environmental safety.

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