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67 Effect of 3 -DSS on the Anti-oxidation of RI/R Injury in Rats

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the skin on the neck was sterilized with 75% alcohol. Cut open the skin, the subcutaneous tissue and the muscularis along the middle of the neck, find the lamina praetrachealis and cut it open. Find the common carotid artery; then occlude the artery with an artery clip. Dilate the eye pupil adequately, and use fluorescence fundus angiography (FFA) to ensure retinal ischemia has occurred. After 60 min of occlusion, remove the artery clip and again use the FFA to ensure reperfusion has occurred. Repeat all the steps for the sham group, except for occluding the common carotid artery. 1 ml/kg NS was injected through sublingual vein after CCA was dissociated in sham group. Other groups were treated with normal saline, low-dosage DSS and high-dosage DSS through sublingual vein respectively before occlusion of CCA.

67.2.3Detection of MDA and NO Concentration, SOD and GSH-PX Activity

After 60 min of reperfusion, blood was taken from the rats’ abdominal vein, then put on the centrifuge for 10 min at 3,000 rpm and 4C. The serum was separated and kept at –80C. Strictly following the instruction of the reagent kits, use Xanthine oxidase (the hydroxylamine method) to detect the activity of SOD, use the colorimetric method to detect the activity of GSH-PX, use the Thibabituric acid to detect the concentration of MDA, and use the method of Nitrate Reductase to detect the concentration of NO.

67.2.4 Statistical Analysis

All experimental data are expressed as means ± SEM. Statistical comparisons between the control and treatment groups were carried out using one-way analysis of variance (ANOVA) followed by Newman-Keuls post-hoc test. Probability levels of 0.05 or smaller were used for reporting statistical significance.

67.3 Results

67.3.1The Effect of DSS on the Concentration of MDA in Serum After RI/R Injury

As shown in Fig. 67.1, the MDA concentration of the model group was higher than that of the sham operation group (P<0.05), while after the treatment of low-dosage DSS, the concentration of MDA decreased (P<0.05).

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H. Zhihua et al.

Fig. 67.1 Concentration of

MDA in serum

67.3.2The Effect of DSS on the Activity of SOD in Serum After RI/R Injury

As shown in Fig. 67.2, the activity of serum SOD enhance after low-dosage DSS treatment (P<0.05).

Fig. 67.2 Activity of SOD in serum

67.3.3The Effect of DSS on the Activity of Serum GSH-PX After RI/R Injury

As shown in Fig. 67.3, the activity of serum GSH-PX was increased significantly after high-dosage DSS treatment (P<0.05).

67 Effect of 3 -DSS on the Anti-oxidation of RI/R Injury in Rats

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Fig. 67.3 Activity of

GSH-PX in serum

67.3.4The Effect of DSS on the Concentration of Serum NO After RI/R Injury

As shown in Fig. 67.4, the concentration of serum NO of the model group is lower than that of the sham operation group (P<0.001), while in both the low-dosage (P<0.05) and high-dosage treatment group (P<0.001), the concentration of serum NO increased, with the extent of increase dependent on the dosage.

Fig. 67.4 Concentration of NO in serum