摘要目的 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.

abstractsObjective 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.