Table II.

Relative expression levels of Nrf2 and HO-1 mRNA in different groups.

Group	Nrf2	HO-1
CG	0.823±0.016	2.621±0.040
MG	1.707±0.029a	4.086±0.031a
ELG	3.375±0.039a-c	5.472±0.042a-c
EMG	5.436±0.052a-d	7.391±0.056a-d
EHG	1.612±0.044a	4.003±0.039a

Values are mean ± SD.

^aP<0.05 vs. CG;

^bP<0.05 vs. MG;

^cP<0.05 vs. EHG;

^dP<0.05 vs. ELG. HO-1, heme oxygenase-1; Nrf2, nuclear factor-erythroid 2-p45-related factor 2; CG, blank control group; MG, model group; ELG, high oxygen exposure + low etomidate dose group (0.3 mg·kg^-1); EMG, high oxygen exposure + moderate etomidate dose group (3.0 mg·kg^-1); EHG, high oxygen exposure + high etomidate dose group (10 mg·kg^-1).