内毒素所致肺损伤小鼠肺结肠蛋白质组学变化及其桔梗大黄的作用

Proteomics Changes of Mice Lungs and Colon during Lipopolysaccharide-Induced Lung Injury and the Effect of Platycodonis Radix and Rhei Radix et Rhizoma

目的内素素(LPS)所致肺损伤时肺和结肠的蛋白质组学变化及桔梗大黄作用。方法实验分为对照组、LPS组、LPS+桔梗组、LPS+大黄组。经气管注射LPS造模并给药,7天后称体质量,测排便量,取肺和结肠,分别做组织病理学和蛋白组变化检测。结果①给LPS后小鼠体质量下降,肺组织出现炎性反应,排便量增加。桔梗和大黄能改善肺组织炎性反应,减少排便量。②肺和结肠表达上调蛋白中,肺脏涉及基因转录,结肠则涉及线粒体内质网及其代谢。肺和结肠均有涉及肌蛋白收缩的蛋白升高。桔梗抑制肺上调蛋白多于大黄。③肺和结肠出现下调蛋白中,在肺脏涉及细胞膜等,在结肠涉及核酸和ATP结合等。肺和结肠共同表达下调的蛋白主要涉及细胞膜内质网及核酸结合方面,桔梗抑制肺下调的蛋白明显多于大黄。结论LPS所致肺损伤可以引起肺和结肠蛋白表达变化,肌细胞收缩蛋白表达升高可能是肺和结肠相关性的分子机制之一。

Objective To study the proteomic profiling of lung and colon during lung injury induced by lipopolysaccharide(LPS).Methods Mice were divided into four groups:the control,LPS,LPS+Platycodonis Radix(PR)and LPS+Rhei Radix et Rhizoma(RRR).LPS was injected into the lungs through trachea,and the drugs were given by intragastric injection.The mice were weighed,the faeces of each mouse were determined,and the lungs and colon were isolated for analysis of pathophysiological changes and proteomics.Results①After 7 days of LPS,the weight of mice decreased,the lung showed inflammatory changes,and the faeces increased.Both PR and RRR can improve the inflammation.②There are lot of proteins was increased in lung mainly involved in gene transcription and in colon mainly involved in mitochondrial,endoplasmic reticulum and metabolism,etc.The up-regulated proteins shared by both lung and colon were involved in myoprotein contraction.PR can inhibit the up-regulated protein more than RRR in lung.③There are large number of proteins were down-regulated in lung involved in cell membrane and in colon involved in nucleic acid binding and ATP binding.The down-regulated proteins shared by both lung and colon were involved in endoplasmic reticulum,nucleic acid binding and cell membrane,etc.The down-regulated proteins in lung by PR are more than those by RRR,which is involved in endoplasmic reticulum,cell membrane,etc.Conclusion LPS-induced lung injury can cause changes in the expression of protein in lung and colon proteins,and the increase in the expression of myoprotein contraction genes may be one of the molecular mechanisms related to lung and colon.