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lüll S-nitrosylation/denitrosylation and apoptosis of immune cells Duan S; Chen CCell Mol Immunol 2007[Oct]; 4 (5): 353-8Nitric oxide (NO) as an immunoregulatory molecule, predominantly depending on S-nitrosylation, acts as a versatile player that executes its regulation and signal transduction for exerting its multi-functions and pleiotropy. Apoptosis of immune cells is an intricate process coupled with positive/negative selection depending on integrated diverse endogenous and exogenous signals and functions to sustain homeostasis in the immune system. Here, the dual roles of NO depending on its concentration in apoptosis are reviewed, breeding up a switch mode in the apoptotic process. Following comments of different switches from apoptosis-death, a new finding of checkpoint (early fluorescence point) of GSNO-initiated thymocyte apoptosis and NOS-GSNOR double control are highlighted. Moreover, S-nitrosylation/denitrosylation, being as a redox switch, logically approaches to networks of metabolism itself and further accesses the neuroendicrine-immune-free radical network as a whole. Moreover, the host defense mediated by NO on pathogens, via protein S-nitrosylation are also discussed.|*Apoptosis[MESH]|Aldehyde Oxidoreductases/*metabolism[MESH]|Animals[MESH]|Nitric Oxide Synthase/*metabolism[MESH]|Nitric Oxide/*metabolism[MESH]|Oxidation-Reduction[MESH]|Proteins/metabolism[MESH]|S-Nitrosoglutathione/*metabolism[MESH]|Signal Transduction[MESH]|T-Lymphocytes/cytology/*immunology/*metabolism[MESH] |