金黄色葡萄球菌侵袭烫伤家兔致淋巴细胞蛋白质组的变化

目的 观察金黄色葡萄球菌(SA)侵袭烫伤家兔后淋巴细胞蛋白质组的变化.方法 将24只家兔按随机数字表法分为对照组、烫伤组、sA侵袭2 h组、sA侵袭6 h组,每组6只.对照组家兔37℃模拟烫伤;其余3组家兔均造成背部30%TBSAⅢ度烫伤,SA侵袭2、6 h组分别于伤后18、22 h经耳缘静脉注射2 mL(1.0×108CFU/mL)对数生长期sA悬液.4组家兔致伤后24 h取颈动脉血分离获取淋巴细胞,提取细胞总蛋白,进行双向凝胶电泳和质谱分析.结果 4组家兔淋巴细胞平均蛋向质点数约为1030个;与对照组比较,其余3组筛选出差异蛋白质点19个,1鉴定了其中11个蛋白质点,包括10种蛋白质.表达下调的蛋白质有丝切蛋白、胞溶质蛋白A、泛素、核苷二磷酸激酶、,奋氨酸脱氢酶和膜联蛋白1,而过氧化物氧化还原素表达明显上调.结论 家兔烫伤后或烫伤+SA侵袭后淋巴细胞蛋白质组发生了明显变化,这可能与伤后免疫抑制和脓毒症的发生有关.

Proteomic change in lymphocytes of scalded rabbits caused by Staphylococcus aureus invasion

Objective To study the proteomic change in Iymphocytes of rabbits with scald injury and Staphylococcus aureus (SA) invasion. Methods Twenty-four rabbits were divided into four groups as follows: control group, scald group, scald with SA invasion 2 hs group, and scald with SA invasion 6 hs group, according to random number table, with 6 rabbits in each group. Except for rabbits in control group (sham scald at 37 ℃ ) , rabbits in the other 3 groups were subjected to 30% TBSA full-thickness scald. Rabbits in SA invasion 2 and 6 hs groups were injected with 2 mL (1.0×108 CFU/mL) SA suspension, which was in the log growth phase, via auricle vein 18 hs and 22 hs after injury. Whole blood samples were collected from carotid artery of rabbits in 4 groups 24 hs after scald. Lymphocytes were isolated and its ex-tracted proteins were analyzed by two-dimensional gel electrophoresis coupled with mass spectroscopy. Re-suits About 1030 protein spots of lymphocytes were detected in each group. Compared with that of control group, 19 protein spots were found to be differentially expressed in the other 3 groups, and 11 spots (10 pro-teins) were identified. Expression levels of cofilin, cyclophilin A, ubiquitin, nucleoside diphosphate ki-nase, glutamate dehydrogenase and annexin 1 were down-regulated, but expression level of peroxiredoxin was up-regulated obviously. Conclusions There is obvious proteornic change in lymphocytes of scalded rabbits or of scalded rabbits invaded by SA, and it may relate to immune suppression and sepsis after injury.