Figure 4.

Increase in the intracellular concentrations of GSH after incubation with sulfite, compared with those after H₂S, H₂S₂, or H₂S₃. Intracellular concentrations of GSH in primary neuronal cultures were measured by HPLC 4 h after the application of Na₂SO₃ (A), Na₂S (B), Na₂S₂ (C), and Na₂S₃ (D) with or without glutamate. All data shown are means ± SEM (n = 5). *P < 0.05, significantly different as indicated, for values without glutamate; Tukey−Kramer test. ^# P < 0.05, significantly different as indicated, for values with glutamate.