[ D -Ala
, D -Leu
]-Enkephalinamide (DADLE)-induced decrease in malondialdehyde (MDA) and NO in the cortex exposed to ischemia/reperfusion (I/R) stress. * P < 0.05 versus the control group. #P < 0.05 versus I/R group. Note that I/R stress largely increased the contents of MDA and NO in the cortex by 40% to 100%, which was significantly reduced by δ-opioid receptor (DOR) activation with DADLE.