胰岛素不同时机给药对脓毒症大鼠炎性反应的影响

目的:通过注射内毒素(LPS)建立的大鼠脓毒症模型,观察胰岛素不同时机给药对血清和肝细胞因子表达的影响。方法:将81只大鼠分为九组,即A组腹腔注射等渗盐水;B组腹腔注射LPS;C、D、E、F、G、H、I组分别在腹腔注射LPS前30 min和注射后0、1、3、6、12、24 h给予胰岛素治疗。观察各组大鼠LPS注射后24和48h血清白细胞介素-1β(IL-1β)、IL-6、肿瘤坏死因子α(TNF-α)和IL-10的变化,以及LPS注射48 h后肝组织IL-1β、IL-6、TNF-α和IL-10的变化。结果:注射LPS后24和48 h,大鼠血IL-1β、IL-6、TNF-α和IL-10均显著增加。LPS注射48 h后,肝组织中IL-1β、TNF-α、IL-6和IL-10蛋白水平也明显增加。在注射LPS前30 min或注射后6 h内给予胰岛素,能明显降低注射后24和48 h血清中的IL-1β、TNF-α和IL-6水平(P0.05);而IL-10水平则仅在注射LPS前或注射同时给予胰岛素,才较LPS组明显增加(P0.05)。在LPS注射前30 min或注射后6 h内给予胰岛素,注射后48 h肝内的IL-1β和TNF-α水平较LPS组明显降低(P0.05);而肝的IL-6水平仅在LPS注射前30min或与同时给予胰岛素时,才较LPS组明显降低(P0.05)。结论:胰岛素对脓毒症大鼠有抑制炎性细胞因子,增加抗炎介质释放等保护作用。在注射LPS 6 h内给予胰岛素可发挥良好的抗炎保护作用,而在注射LPS 6 h后给予胰岛素治疗其抗炎保护作用明显减弱。

Timing of insulin therapy change its affect of inflammatory response in endotoxemic rats

Objective: The aim of the present study was to determine whether timing of insulin administration influences the hepatic and serum proinflammatory and anti-inflammatory cytokines during endotoxemia stimulated by LPS.Methods: 81 Male Sprague Dawley rats were divided in 9 groups: Group A was sham control group(rats were treated with saline and without insulin or LPS);Group B was LPS group(rats were treated with LPS and without insulin);In Group C,D,E,F,G,H and I,insulin was given on 30 min pre LPS administrat...