Figure 8. Synergic effect of H₂O₂ and NOs species on cell viability.

NHSF (A), MRC5Vi (B), Lu1205 (C), and HCT116 (D) cells were untreated (Ctr) or exposed to a mixture of NO₂⁻ and NO₃⁻, H₂O₂ alone, a mixture of H₂O₂ and NO₂⁻ or NO₃⁻, or a mixture of H₂O₂, NO₂⁻ and NO₃⁻. The concentrations of H₂O₂, NO₂⁻ and NO₃⁻ were those determined after a He plasma treatment of 2 min at a gas flow of 50 sccm (see Fig. 3). The cell viability assay was performed 24 h post treatment. The data are the mean ± SD of 6 independent experiments. The cell viabilities after an indirect He plasma treatment at a gas flow of 50 sccm are also indicated.