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Related Experiment Videos

Nitric oxide induces apoptosis in mouse thymocytes

K Fehsel1, K D Kröncke, K L Meyer

  • 1Institute of Immunobiology, Heinrich Heine University, Düsseldorf, Germany.

Journal of Immunology (Baltimore, Md. : 1950)
|September 15, 1995
PubMed
Summary

Nitric oxide (NO) induces thymocyte apoptosis, a process involving p53 upregulation. However, NO also protects thymocytes from glucocorticoid-induced apoptosis, highlighting its complex role in immune regulation.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Nitric oxide (NO) is a key molecule in immune regulation and defense.
  • The role of NO in triggering apoptosis in thymocytes requires further investigation.

Purpose of the Study:

  • To investigate the role of nitric oxide (NO) in inducing apoptosis in thymocytes.
  • To explore the protective effects of NO against glucocorticoid-induced apoptosis.

Main Methods:

  • Incubation of thymocytes with chemical NO donors.
  • Detection of DNA strand breaks using in situ nick translation.
  • Flow cytometry analysis of thymocyte subpopulations (CD4+CD8+).
  • PCR analysis for p53 expression.
  • In vivo studies using endotoxin-treated mice.
  • In vitro coculture experiments with activated endothelial cells.

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Main Results:

  • NO donors induced significant thymocyte apoptosis (30% vs. 10% in controls).
  • Apoptosis was prevented by ZnSO4 and accompanied by increased p53 expression.
  • NO pre-exposure protected thymocytes from glucocorticoid-induced apoptosis.
  • In vivo, LPS treatment increased thymic apoptosis near blood vessels with high inducible NO synthase expression.
  • In vitro, activated endothelial cells induced thymocyte apoptosis, preventable by NO inhibition.

Conclusions:

  • Nitric oxide (NO) can directly induce thymocyte apoptosis.
  • NO exhibits a protective role against glucocorticoid-induced apoptosis in thymocytes.
  • These findings reveal a dual role for NO in thymocyte apoptosis, impacting immune regulation.