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Alteration of mitogen-activated protein kinase pathway after soman poisoning

Jan Osterreicher1, Jaroslav Pejchal, Jiri Kassa

  • 1Department of Radiation Biology, Faculty of Military Health Sciences, University of Defense, Hradec Kralove, Czech Republic.

Drug and Chemical Toxicology
|July 7, 2007
PubMed

Insights

Sublethal soman poisoning in rats altered p38 MAPK, c-jun, and c-myc expression in enterocytes. These changes may link nerve agent exposure to long-term effects like cell proliferation, apoptosis, and carcinogenesis.

Area of Science:

  • Toxicology
  • Molecular Biology
  • Cellular Biology

Background:

  • Nerve agents like soman can cause long-term health issues.
  • The underlying molecular mechanisms, particularly in the gut, are not fully understood.
  • Investigating cellular signaling pathways is crucial for understanding these effects.

Purpose of the Study:

  • To investigate the pathogenetic mechanisms of long-term effects of soman poisoning.
  • To examine the role of p38 MAPK and transcription factors (c-jun, c-myc, elk-1) in rat enterocytes post-soman exposure.

Main Methods:

  • Wistar rats were administered a sublethal dose of soman (70% LD50).
  • Enterocytes from the colon transversum were analyzed 3 and 5 days post-poisoning using immunohistochemistry and image analysis.
  • Protein expression of p38 MAPK, c-jun, c-myc, and elk-1 was quantified and compared to control groups.

Main Results:

  • Activated p38 MAPK expression was significantly reduced in soman-poisoned rats at both time points.
  • c-myc and c-jun expression increased significantly 3 days after poisoning but decreased by day 5.
  • No significant changes were observed in elk-1 expression.

Conclusions:

  • Long-term depression of MAPK pathway members may facilitate cell proliferation in soman-poisoned rats.
  • This altered signaling could be a contributing factor to apoptosis and carcinogenesis following nerve agent exposure.
  • Understanding these molecular changes is vital for developing therapeutic strategies against nerve agent-induced long-term effects.

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