烧伤、冲击伤及烧冲复合伤后大鼠早期血清中性粒细胞弹性蛋白酶的变化及意义

目的 探讨中性粒细胞弹性蛋白酶(NE)在大鼠烧伤、冲击伤与烧冲复合伤后早期血清中浓度的变化及意义.方法 选择雄性SD大鼠176只,随机分为对照(C)组、烫伤(BU)组、冲击伤(BL)组与烧冲复合伤(BB)组.C组不致伤;BU组背部脱毛置人94 ℃水中12 s,致25%体表面积(TBSA)Ⅲ°烫伤;BL组以5 g 8701压缩炸药柱为爆炸源,以左侧胸壁距爆炸源75 cm距离进行爆炸,致中度冲击伤;BB组同BL、BU组伤情先致冲击伤后立即烫伤.伤后24 h内,BU、BB组按照50 ml/kg,腹腔注射乳酸钠林格注射液抗休克治疗,1次/12 h.致伤组分为伤后3 h、6 h、12 h、1 d、2 d、3 d、7 d共7个时相点.测定各时相点支气管肺泡灌洗液(BALF)总蛋白浓度(BCA法)、肺组织含水率(称重法)及血清NE浓度(ELISA法).结果 各致伤组SD大鼠的BALF总蛋白浓度、肺组织含水率及血清NE浓度伤后各时相点均高于C组(P＜0.01或P＜0.05),其伤后峰值均出现在2 d以内,尤其是伤后2 d,BU组、BL组及BB组血清NE浓度分别为(319.85±19.50)ng/ml,(467.43±31.64)ng/ml,(626.00±26.38)ng/ml;C组(78.53±25.10)ng/ml.组间比较,总体伤情水平BB组＞BU组及BL组(P＜0.01或P＜0.05).相关分析表明,伤后3d内,BU组血清NE浓度与BALF总蛋白浓度、肺组织含水率均存在显著正相关(r=0.7910,0.8078,P＜0.05),BB组血清NE浓度与BALF总蛋白浓度存在显著正相关(r=0.8672,P＜0.05).结论 NE可能在烧伤、冲击伤,尤其是烧冲复合伤的早期肺损伤中起到了重要作用.

Early changes in serum neutrophil elastase in rats with burn, blast injury or combined burn-blast injury and its significance

Objective To explore the early changes in serum neutrophil elastase(NE) in rats with burn.blast injury or combined bum-blast injury and its significance.Methors A total of 176 male Spragne Dawley rats were randomly divided into four groups:control(C),burn(BU),blast injury(BL) and burn-blast combined injury(BB).Rats in C group were not injured.Animals in BU group were subjected to 25% TBSA full-thickness burn on back with 94℃ water for 12 seconds;Animals in BL group were inflicted with moderate blast injury with 5g 8701 compressed dynamite stick as the explosion source 75 cm away while left chest facing the explosive source;Rats in BB group were burned immediately after the blot injury similarly as in BL group.During the first 24 h post-injury,animals in BU and BB groups received intraperitoneal bronchoalveolar lavage fluid(BALF),water content of lung tissue and NE content in serum were determined at 0 h(C group),3 h,6 h,12 h,1 d,2 d,3 d,7 d post-injury.Results Protein concentration in BALF,water content of lung tissue and NE content in serum in SD rats of the injured groups were significantly higher than those in C group(P＜0.01 or P＜0.05),peaked within 2 d post-injury,especially at 2 d post-injury(NE content in serum:BU group,319.85±19.50,ng/ml;BL group,467.43±31.64 ng/ml;BB group,626.00±26.38 ng/ml vs.C group,78.53±25.10 ng/ml).Overall,protein concentration in BALF.water content of lung tissue and NE content in serum in BB group were significantly higher than BU and BL groups(P＜0.01 or P＜0.05).Correlation analysis showed that within 3 d post-injury.a significant positive correlation was found between the protein concentration in BALF,water content of lung tissue and NE content in serum(r=0.7910,0.8078,P＜0.05) in BU group.NE content in serum and protein concentration in BALF were significantly positively correlated in BB group(r=0.8672,P＜0.05).Conclusion NE may play an important role in early lung injury of burn or blast injury,especially in combined bum-blast injury.