目的 探讨丁酸钠(sodium butyrate,BTR)对严重烫伤大鼠小肠黏膜血流量和微血管通透性的影响。方法 雄性SD大鼠48只,体重240~260 g,随机分为假烫组、烫伤组和丁酸钠组,每组16只。烫伤组和丁酸钠组采用沸水烫伤背部15 s、腹部8 s,造成50%总体表面积(TBSA)Ⅲ度烫伤;假烫组采用37 ℃温水浸泡相同部位及时间。于烫伤后立即腹腔注射丁酸钠(400 mg/kg)或等体积生理盐水。烫伤后3 h和6 h测定小肠黏膜血流量;检测血浆二胺氧化酶(DAO)活性;取小肠组织检测含水率及微血管通透性。结果 假烫组大鼠小肠黏膜血流量丰富,血浆DAO活性正常,小肠微血管通透性和含水率为正常水平。大鼠严重烫伤后,小肠黏膜血流量迅速降低,DAO活性显著增强,小肠微血管通透性和含水率明显增高。烫伤后3 h,丁酸钠组与烫伤组比较,小肠组织微血管通透性[(4.26±0.98)μg/ml vs (5.53±1.31)μg/ml]、含水率[(63.67±3.35)% vs (74.32±3.74)%]、血浆DAO[(43.76±9.34)U/L vs (73.29±11.34) U/L]均显著降低,小肠黏膜血流量明显升高[(67.21±9.47)BPU vs (55.18±10.48)BPU](均P<0.05)。烫伤后6 h,丁酸钠组与烫伤组比较,小肠微血管通透性[(6.89±1.12)μg/ml vs (8.92±1.69) μg/ml]、含水率[(68.45±4.52)% vs (80.76±3.94)%]、血浆DAO[(47.59±10.71)U/L vs (89.87±11.93) U/L]均明显降低,小肠黏膜血流量明显升高[(47.77±8.93)BPU vs (25.64±7.42)BPU](均P<0.05)。结论 丁酸钠能增加严重烫伤大鼠小肠黏膜血流量,降低小肠微血管内皮通透性和组织水肿,对小肠组织具有保护作用。
Abstract
Objective To investigate the small intestine micro-vascular permeability and blood flow protective effects of sodium butyrate on rats following 50%TBSA full-thickness burns. Methods 48 SD rats, weighing 240-260 g, were randomly divided into three groups: sham group, scald group, scald + BTR group. Rats in scald group and scald + BTR group were subjected to 50% TBSA third-degree burns by immersing the back for 15 seconds and the abdomen for 8 seconds in boiling water. The sham group was immersed in 37 ℃ water instead. And then 1ml BTR (400 mg/kg) or 1ml normal saline was intraperitoneally injected, respectively. Blood flow in small intestine was measured by Doppler 3 and 6 hours after injury. Blood was drawn from the heart at 3 and 6 hours after injury for measurement of serum diamine oxidase (DAO); the small intestine tissues were harvested for the measurement of micro-vascular permeability and the changes in tissue water content. Results Compared with scald group, the activity of DAO [(43.76±9.34)U/L vs (73.29±11.34) U/L], the micro-vascular permeability [(4.26±0.98)μg/ml vs (5.53±1.31) μg/ml] and the rate of tissue water [(63.67±3.35)% vs (74.32±3.74)%] in scald + BTR group were significantly lower at 3 hours after scald injury (all P<0.05). In addition, BTR was shown to significantly increase the IMBF level [(67.21±9.47)BPU vs (55.18±10.48)BPU] induced by scald injury at 3 hours (P<0.05). The result at 6 hours after scald injury was similar to 3 hours. Conclusions Sodium butyrate has significant protective effects on small intestinal micro-vascular permeability and blood flow in rats with severe scald injury.
关键词
丁酸钠 /
烫伤 /
小肠 /
含水率 /
血管通透性
Key words
sodium butyrate /
scald /
small intestine /
tissue water content /
vascular permeability
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