抑制应激对严重烧伤大鼠炎症反应的影响

目的　观察冬眠药物对严重烧伤大鼠应激和炎症反应的影响。方法　SD大鼠 30 %TBSA深Ⅱ度烧伤 ,分为烧伤立即复苏组 (A组 ,30只 )、烧伤立即复苏冬眠合剂组 (B组 ,30只 )、烧伤延迟复苏组 (C组 ,30只 )、烧伤延迟复苏冬眠合剂组 (D组 ,2 5只 )、对照组 (假烧伤 ,E组 ,6只 )。高效液相色谱法检测伤后 3、6、12、2 4和 4 8h大鼠血浆中去甲肾上腺素 (NE)、肾上腺素 (E)和多巴胺 (DA)含量 ,ELISA和RIA法测定血浆IL 1α和PGE2 水平 ,激光共聚焦显微镜定位分析单个核细胞 (PBM Cs)中核因子 κB(NF κB)活性。　结果　血浆NE水平于伤后 6h达高峰 ,同一时相B组最低。血浆E水平亦于伤后 6h达高峰 ,B组峰值较其他组低。血浆DA水平在各组间和各时相点差异无统计学意义。伤后血浆IL 1α和PGE2 水平持续上升 ,同一时相B组低于A组 ,D组低于C组 ;同一时相B、D两组比较 ,B组低于D组。E组NF κB位于PBMCs胞浆中 ,A组伤后 6hNF κB以胞核浓度为高 ;B组胞浆和胞核中均有NF κB ,但以胞浆浓度为高 ;C或D组NF κB浓集于胞核内。　结论　冬眠药物能减少严重烧伤大鼠应激激素的分泌 ,可调节PBMCs的NF κB核移位和降低血浆炎症细胞因子水平

An experimental study on the influence of inhibition of postburn stress on inflammatory reaction in severely scalded rats

OBJECTIVE: To investigate the influence of hibernation drugs on postburn stress and inflammatory reaction in severely scalded rats. METHODS: Sprague-Dawley rats inflicted with 30% TBSA deep partial thickness scalding were employed as the model. The rats were divided into A (scalding with immediate resuscitation), B (scalding with immediate resuscitation and lytic cocktail), C (scalding with delayed resuscitation), D (scalding with delayed resuscitation and lytic cocktail) and E (sham injury) groups. The rat plasma levels of NE (norepinephrine), E (epinephrine) and DA (dopamine) were determined by HPLC (high performance liquid chromatography) at 3, 6, 12, 24 and 48 postburn hours (PBHs), and the plasma IL-1alpha and PGE(2) levels were detected by ELISA (enzyme-linked immunosorbent assay) and RIA (radioimmunoassay) methods. The NF-kappaB activity in PBMCs (peripheral blood mononuclear cells) was determined by laser scanning confocal microscope. RESULTS: The plasma NE and E levels reached summit at 6 PBH, while those in B group were lowest. But the plasma DA level was similar among all groups at all time points. The plasma IL-1alpha and PGE(2) levels increased continuously, however, the levels were were lower in B than A groups at the same time points, and also that of D were lower than C groups. At the same time points, the levels in B group were lower than those in D group. The NF-kappaB was located in the cytoplasma of PBMCs in E group and in the nucleus in A group at 6 PBH. Furthermore, the NF-kappaB was concentrated more in the cytoplasm than that in the nucleus in B group, while it was more concentrated in the nucleus in C and D groups. CONCLUSION: The secretion of stress hormones could be attenuated by hibernation drugs. The plasma cytokine levels and the nuclear translocation of NF-kappaB in PBMCs could also be modulated by the drugs.