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We have studied cytotoxicity of S-nitroso-N-acetyl- N-DL-penicillamine(SNAP), a Nitric oxide (NO)-releasing compound, in RAW264.7 macrophages. SNAP is cytotoxic to RAW264.7 cells in a concentration-dependent manner. PMA(200 nM) stimulated cells to produce superoxide anton radical($O_2^{-\cdot}$) and caused a little loss of RAW264.7 cell viability for 12 hr and diminished the cytotoxicity of SNAP. The mechanism by which PMA can protect cells against NO-mediated cytotoxicity was studied by peroxynitrite-enhanced chemiluminescence method. Observed results suggested that $O_2^{-\cdot}$ produced by PMAstimulated RAW264.7 cells may quench NO released by SNAP and reduce NO, thus attenuating NO-related damages.

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