摘要
目的:研究肿瘤坏死因子(TNF-α)对谷氨酰胺(Gln)促大鼠组织蛋白质合成的影响。方法:将30只SD大鼠随机分为TPN(对照)组、Gln组和TNF-α组。所有大鼠均行3 d的TPN。对照组仅给予普通TPN液;Gln组在PN液中添加丙氨酰谷氨酰胺二肽,Gln剂量为0.3 g/(kg.d),共72 h;TNF-α组与Gln组相同,并在第3天持续24 h静脉滴注5μg/(kg.d)的TNF-α。所有大鼠均在取材前30 min,一次性静脉注射1.0 mmol/kg的L-15N亮氨酸。实验结束时,分别测定血浆TNF-α、Gln浓度及骨骼肌、小肠、肝组织的Gln浓度和蛋白质合成率。结果:TNF-α组血浆TNF和Gln浓度以及骨骼肌、小肠、肝组织Gln浓度,均显著高于其他两组;Gln组和TNF-α组骨骼肌、小肠、肝组织中蛋白质合成率均高于对照组,Gln组最高。各组间差异均有显著性意义(P<0.01)。结论:Gln能促进组织蛋白质合成,TNF可抑制感染状态下Gln的促蛋白质合成作用。Gln和TNF均能使血浆及组织中Gln浓度升高。
Objective:To determine whether the regulation of glutamine on protein synthesis in tissues could be inhibited by TNF-α(one of the major mediators) in sepsis in a rat model. Methods:Thirty male Sprague-Dawley rats were randomly assigned into three groups:TPN(control),Gln(treated with glutamine),and TNF-α group(treated with glutamine and TNF-α).All rats received isonitrogenous and isocaloric TPN solutions for 3 days.Control group was supplemented by TPN;glutamine group was given glutamine-enriched TPN and TNF...
出处
《肠外与肠内营养》
CAS
2008年第1期7-10,共4页
Parenteral & Enteral Nutrition
基金
国家自然科学基金资助项目(30672060)