Protective effect and mechanism of sevoflurane in renal ischemia-reperfusion injury in rats
Yang Chuanming1,2, Yi Ming1,2, Han Bing2, Zhang Yisu2, Li Xiaohong1
1Department of Anaesthesiology , the First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, China; 2Graduate School of Bengbu Medical College, Bengbu 233030, China
Abstract:Objective This study aimed to investigate the effect of sevoflurane on renal ischemia-reperfusion injury in rats and its mechanism. Methods Forty male SD rats, aged 6-8 weeks old with a body weight of (250±30) g, were randomly divided into four groups: the sham surgery group (Sham group), renal ischemia-reperfusion group (IR group), sevoflurane pretreatment group (Sev group), and sevoflurane pretreatment+silencing signal regulator 1 (SIRT1) inhibitor group (EX group), with 10 rats in each group. Two days before the preparation of the renal ischemia-reperfusion injury model and 10 min before surgery, the rats in the Sham, IR, and Sev groups were intraperitoneally injected with 1% dimethyl sulfoxide (DMSO) solution (5 mL/kg), and the EX group was intraperitoneally injected with 1% DMSO solution (5 mL/kg) containing the EX-527 inhibitor (1 mg/mL). In the Sham group, the right kidney was removed, and the left kidney was exposed but not clamped. In the IR group, the right kidney was resected, and an left renal ischemia-reperfusion model was established. In the Sev group and EX group, sevoflurane was inhaled for 45 min, and then an ischemia-perfusion model was prepared in accordance with the method used in the IR group. Three hours after the preparation of the ischemia-reperfusion model, renal tissue and left ventricular blood of each group were collected, and the rats were sacrificed by cervical dislocation after the material was collected. Observation was performed as follows: (1) Serum creatinine (Scr) and urea nitrogen (BUN) were detected in the left ventricle of rats in each group. (2) Pathological sections of kidney histopathology of each group of rats were prepared; pathological changes in kidney tissue were observed under light microscopy, and renal tubules were scored in accordance with the Paller scoring standard to evaluate kidney damage. (3) In-situ terminal deoxynucleotidyl transferase-mediated dUTP incision-end labeling technology was used to detect apoptosis in kidney tissue cells of rats. (4) The pathological sections of kidney tissue in each group were taken, and the autophagy of kidney tissue was observed under transmission electron microscopy. (5) Western blotting was used to detect the expression level of SIRT1, forkhead box transcription factor O3 (FoxO3), and apoptotic (BAX/Bcl-2) and autophagy-related (Beclin1, LC3A/B) proteins in rat kidney tissue. Results (1) Scr and BUN detection results in each group were shown as follows: (50.74±5.91) μmol/L and (10.11±0.80) mmol/L in the Sham group, (90.18±11.22) μmol/L and (53.39±6.29) mmol/L in the IR group, (63.70±8.69) μmol/L and (27.68±3.41) mmol/L in the Sev group, and (80.18±9.15) μmol/L and (33.20±3.57) mmol/L in the EX group. Compared with the Sham group, serum Scr and BUN levels were increased in the IR group, Sev group, and EX group. Compared with the IR group, serum Scr and BUN levels decreased in the Sev group and EX group. Compared with the Sev group, serum Scr and BUN levels were increased in the EX group. The differences were statistically significant (all P values<0.05). (2) Renal histopathological changes in each group: the morphological structure of glomeruli and renal tubules in the Sham group was basically normal; in the IR group, the tubular epithelial tissue was swollen; the tubular cells were arranged disorderly; a large number of nuclei were solidified, and a large number of neutrophils were infiltrated; in the Sev group, tubular epithelial cells swell mildly, nuclear shrinkage necrosis occurred rarely, and neutrophil infiltration significantly reduced; in the EX group, renal tubular epithelial tissue swelling was evident, nucleus contraction and lysis were increased, and neutrophil infiltration is high. The tubular Paller scores of the Sham group, IR group, Sev group, and EX group accounted for (0.61±0.15),(5.05±0.55),(2.68±0.33),(4.51±0.49). Compared with the Sham group, the Paller scores were higher in the IR group, Sev group, and EX group. Compared with the IR group, the Paller scores of the Sev group and EX group decreased. Compared with the Sev group, the Paller score was increased in the EX group, and the difference was statistically significant (all P value<0.05). (3) Apoptosis of renal histocytes in each group: the apoptotic rates in the Sham group, IR group, Sev group, and EX group accounted for 8.71%±0.68%, 38.15%±2.23%, 14.51%±2.02%, and 32.55%±2.89%, respectively. Compared with the Sham group, the apoptotic rate of cells in the IR group, Sev group, and EX group was increased. Compared with the IR group, the apoptotic rate of cells in the Sev group and EX group decreased. Compared with the Sev group, the apoptotic rate of cells in the EX group was increased, and the difference was statistically significant (all P value<0.05). (4)Autophagy in renal tissues of each rat group was compared under electron microscopy. Compared with the Sham group, the number of autophagies in the IR group, Sev group, and EX group increased. Compared with the IR group, the number and volume of autophagies increased in the Sev group and EX group. Compared with the Sev group, the number of autophagies in the EX group was significantly reduced. The difference was statistically significant (all P value<0.05). (5) The expression level of SIRT1, FoxO3, and apoptotic (BAX/Bcl-2) and autophagy-related (Beclin1 and LC3A/B) proteins was compared in renal tissues of rats. Compared with the Sham group, the relative expression level of FoxO3, Beclin1, LC3A/B protein, and BAX/Bcl-2 protein in the IR and EX groups was increased, whereas that of of SIRT1 was decreased. In addition, the relative expression level of SIRT1, FoxO3, Beclin1, LC3A/B, and BAX/Bcl-2 proteins in the Sev group was all increased, with statistical significance (all P values<0.05). Compared with the IR group, the relative expression level of SIRT1, Beclin1, and LC3A/B proteins was increased in the Sev group, whereas the relative expression level of FoxO3 and BAX/Bcl-2 proteins was decreased. The relative expression level of SIRT1 protein was increased in the EX group, whereas the relative expression level of FoxO3 and BAX/Bcl-2 proteins was decreased. The differences were statistically significant (all P values<0.05). Compared with the Sev group, the relative expression level of SIRT1, Beclin1, and LC3A/B proteins in the EX group was decreased, whereas the relative expression level of FoxO3 and BAX/Bcl-2 proteins was increased: the differences were statistically significant (all P values<0.05). Conclusion Sevoflurane treatment can protect rats from renal ischemia-reperfusion injury by promoting autophagy and inhibiting apoptosis by an underlying mechanism related to the activation of the SIRT1-FoxO3 signaling pathway.
杨传铭, 易铭, 韩冰, 张一粟, 李晓红. 七氟烷对大鼠肾缺血再灌注损伤的影响及其机制[J]. 中华解剖与临床杂志, 2023, 28(11): 749-757.
Yang Chuanming, Yi Ming, Han Bing, Zhang Yisu, Li Xiaohong. Protective effect and mechanism of sevoflurane in renal ischemia-reperfusion injury in rats. Chinese Journal of Anatomy and Clinics, 2023, 28(11): 749-757.
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