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Nitric oxide (NO) non-classical signaling regulates immune responses and cellular adaptation. This study reveals NO selectively S-nitrosylates N-Ras during immune synapse formation and identifies cysteine oxidation as an early response to hypoxia.

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Immunology

Background:

  • Nitric oxide (NO) mediates non-classical signaling via protein post-translational modifications like S-nitrosylation.
  • The immune synapse is crucial for T cell activation, involving tightly regulated cellular interactions.
  • Understanding NO signaling selectivity and cellular responses to hypoxia is vital.

Purpose of the Study:

  • To investigate the role of NO signaling in immune synapse formation.
  • To develop and apply proteomic methods for detecting protein S-nitrosylation and cysteine oxidation.
  • To explore cellular responses to acute hypoxia and identify underlying mechanisms.

Main Methods:

  • Proteomic analysis to detect S-nitrosylation and reversible cysteine oxidations.
  • Study of T cells and antigen-presenting cells during immune synapse formation.
  • Investigation of macrophage activation and endothelial cell responses to hypoxia.

Main Results:

  • Endothelial nitric oxide synthase (eNOS) activation leads to protein S-nitrosylation during the immune synapse.
  • N-Ras, but not K-Ras, is selectively S-nitrosylated and activated by NO in T cells.
  • Proteomic methods revealed the role of the thioredoxin pathway in protecting macrophages and identified cysteine oxidation in endothelial cells responding to hypoxia.

Conclusions:

  • NO signaling exhibits short-range selectivity through S-nitrosylation of N-Ras at the immune synapse.
  • Proteomic tools enable the study of NO modifications and cysteine oxidation in cellular processes.
  • Cysteine oxidation is an early response to acute hypoxia in endothelial cells, preceding HIF pathway activation.