Changes of NQO1 and GST-α1 enzymes activity in the brain as determined by biochemical tests in control group (n = 10), SAH group (n = 10), SAH+vehicle group (n = 10) and SAH+tBHQ group (n = 10).

SAH was found to induce the significant increases in the activity of NQO1 and GST-α1 in rat brain tissue. In the SAH+tBHQ group, the cortical activity of NQO1 and GST-α1 was markedly up-regulated relative to the SAH+vehicle group. *P<0.05 vs. control group; #P<0.05 vs. control group; vs. P>0.05 relative to the SAH group.