Table 3.

Relative glutathione contents

Cell lines	Total glutathione	GSSG/total glutathione
M8	1.00  ±  0.17  (15)	1.00  ±  0.02  (14)
pGSOD1	0.74  ±  0.07  (11)*	0.80  ±  0.05  (9)*
pGSOD2	0.59  ±  0.17  (11)*	0.77  ±  0.03  (9)*
pGSOD3	0.78  ±  0.22  (14)	0.76  ±  0.07  (9)*
pGSOD4	0.32  ±  0.12  (10)*	0.73  ±  0.13  (10)*

Total glutathione contents and GSSG/total glutathione ratios are expressed relative to M8 cells. The values correspond to the mean ± SD for the number of determinations indicated in parentheses. Glutathione contents of M8 cells: total glutathione, 6.7 ± 1.1 mg/g protein; GSSG/total glutathione, 0.0114 ± 0.0002 g of GSSG/g of total glutathione (∗, P < 0.05 compared with M8 cells as determined by Student’s t test).