目的利用噬菌体展示肽库筛选技术获得模拟人晚期氧化蛋白产物(advanced oxidation protein products,AOPP)表位的序列,探索该表位的分布与表达。方法以抗晚期氧化蛋白产物多克隆抗体为靶,对噬菌体随机12肽库进行免疫亲和筛选,ELISA鉴定阳性噬菌体克隆特异性;对阳性克隆进行DNA测序并推导其氨基酸序列,利用生物信息学技术检索其分布与相似性。结果经3轮亲和筛选获得18株与靶分子特异结合的阳性噬菌体克隆,阳性率为62.07%。竞争ELISA结果表明,AOPP可有效抑制阳性噬菌体克隆与抗体结合,其中对No.6克隆的IC50达到0.2ug/ml,提示其能模拟AOPP表位。经DNA测序并推导氨基酸序列,得到LXDMLXD保守序列(X为任意氨基酸);发现该序列不存在于正常人与哺乳动物的蛋白分子,但与某些真菌及寄生虫蛋白分子有同源性。结论通过噬菌体肽库筛选技术获得模拟AOPP表位并具良好抗原性的短肽序列;证实该结构不存在于正常人与哺乳动物蛋白分子,正如AOPP并非正常组织蛋白。
Renal fibrosis is a common pathway of progressive renal diseases leading to end-stage renal disease regardless of the etiology. Accumulating evidence indicates that oxidative stress, resulting in generation of reactive oxygen species （ROS）, plays a critical role in the initiation and progression of fibrotic diseases. Nicotinamide adenine dinucleotide phosphate （NADPH） oxidase is the predominant enzyme source for ROS generation and is now recognized as a key mediator of cell proliferation and matrix accumulation in renal disease. Multiple stimuli and agonists, such as transforming growth factor , tumor necrosis factor, platelet derived growth factor, angiotensin II, hyperglycemia, oxidized low-density lipoprotein and albumin have been shown to alter the activity or expression of the NADPH oxidase and ultimately increase ROS production. ROS directly incites damage to biologically important macromolecules and leads to generation of the so-called advanced oxidation protein products （AOPPs） and advanced glycation end products, which are not only markers of oxidative stress but also cause renal injury. Targeting NADPH oxidase and/or reducing AOPPs production miaht be a novel strateav for the theraoeutic intervention of varietv of fibrotic kidney disorders.
