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解毒通络保肾胶嚢干预实验性糖尿病大鼠肾脏氧化应激机制及与脂联素关系的研究
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摘要
目的:糖尿病肾病(diabetic nephropathy, DN)是临床最常见、多发的糖尿病(diabetes mellitus,DM)并发症。是DM最严重的微血管并发症,主要表现为以微血管损害为主的肾小球病变。主要病理表现为毛细血管基底膜通透性增加、基底膜增厚、肾小球系膜区细胞外基质(extracellular matrix, ECM)积聚,日久发展为肾小球硬化,终至肾纤维化。临床上早期主要表现为肾小球肥大,肾小球高滤过状态,继而出现为微量蛋白尿,持续蛋白尿、水肿、高血压、逐渐发展为肾功能不全,终至肾衰竭。DN病因及发病机制错综复杂,目前认为其发生、发展是由于多因素、多途径综合作用的结果。目前现代医学治疗手段主要以降血糖、血压,保护肾功能,延缓DN发生发展。但是目前尚缺乏有效的预防和治疗手段,大部分患者逐渐发展至肾衰竭而危及生命。
     近年来关于DN发病机制的学说中,氧化应激成为糖尿病肾病发病机制的焦点。为抗氧化治疗在DN中的应用提供了理论基础。从脂联素发现以来,诸多研究证实脂联素与DM及DN的关系密切,脂联素不仅有抗炎、抗动脉硬化作用,而且还具有抗氧化作用,脂联素水平的降低可能引起抑制AMPK激活,从而抑制AMPK活化eNOS,引起NO减少,而ROS增加,在肾脏中ECM的聚集增加而引起DN。脂联素可能参与调控DN的氧化应激机制。
     方法:本实验对解毒通络保肾胶囊防治DN进行较系统的研究。重点探讨毒损肾络病机理论与氧化应激机制的关系,以及解毒通络保肾胶囊干预DN的氧化应激发病机制及与脂联素的关系,论证解毒通络保肾胶囊治疗DN的独特优势,进一步证明解毒通络保肾法的科学性,从毒损肾络、氧化应激、脂联素新的角度阐明DN的发病机制。
     本实验研究通过解毒通络保肾胶囊干预实验性糖尿病大鼠肾脏氧化应激机制的研究,探讨解毒通络保肾胶囊对实验性糖尿病大鼠肾脏保护的作用机制及与脂联素的关系,为中医药防治DN提供更为完善的理论及实验依据。本实验研究分为四个部分:
     1采用高脂饲养结合链脲佐菌素(STZ)复制实验性2型DM大鼠模型,按实验需要分为DM模型组、阳性对照组和中药实验组,并设正常对照组。实验过程中密切观察糖尿病大鼠的一般状态;运用酶联免疫吸附法、生物化学等实验技术,检测血生化指标、胰岛素测定、尿微量白蛋白等,研究解毒通络保肾胶囊对实验性糖尿病大鼠肾脏的保护作用;
     2采用免疫组化学法检测纤维连接蛋白(FN)和IV型胶原(Col IV)变化,观察解毒通络保肾胶囊对实验性DM大鼠肾小球系膜区细胞外基质(ECM)积聚的影响;采用光镜、透射电镜观察实验性DM大鼠肾组织病理形态学变化情况;
     3采用免疫组织化学法、双抗体夹心酶联免疫吸附法(ELISA)、荧光实时定量PCR等实验技术,观察解毒通络保肾胶囊对DM大鼠血清ADPN、肾组织ADPN、磷酸化腺苷酸蛋白活化激酶(p-AMPK)及内皮型一氧化氮酶(eNOS)的蛋白表达、肾组织AdipoR1、AdipoR2和eNOS的基因表达的影响;
     4采用ELISA技术,观察解毒通络保肾胶囊对大鼠肾组中活性氧(ROS)、8-羟基脱氧鸟苷(8-OHdG)、3-硝基酪氮酸(3-NT)蛋白及基因表达的影响。
     结果:
     1解毒通络保肾胶囊能改善实验性DM大鼠的一般状态,具有一定的降血糖、改善胰岛素水平及调节血脂异常的作用;
     2解毒通络保肾胶囊能抑制实验性DM大鼠早期肾脏肥大及肾小球高滤过状态,减少尿微量白蛋白的排出,具有一定的保护肾功能的作用;
     3解毒通络保肾胶囊具有抑制实验性DM大鼠肾脏的病理组织形态学及超微结构的改变,减少肾组织的FN及Col IV的表达,减少肾小球系膜区细胞外基质的积聚的作用,从而减轻DM性肾小球硬化,防止肾纤维化,延缓DN的发生发展;
     4解毒通络保肾胶囊具有增加DM大鼠血清ADPN的含量、上调肾组织ADPN蛋白的表达及肾组织AdipoR1、AdipoR2基因表达的作用,且AdipoR1的表达高于AdipoR2表达;
     5解毒通络保肾胶囊具有增加肾组织中p-AMPK的蛋白的表达,同时eNOS基因及蛋白的表达,与脂联素水平的呈正相关。提示脂联素水平增加,可能增强活化AMPK表达上调,AMPK激活eNOS的表达上调。
     6高脂饲养结合STZ造模的DM大鼠肾组织中ROS、8-OHdG、3-NT的含量增加,提示肾脏氧化应激在DN发病机制中起重要作用。肾组织中ROS、8-OHdG、3-NT的含量增加,与血清ADPN水平及肾脏组织中ADPN表达水平呈负相关,表明DN肾脏氧化应激发病与ADPN有一定的关联。
     7解毒通络保肾胶囊能明显抑制DM大鼠肾组织ROS、8-OHdG及3-NT的含量,其抑制氧化应激发病机制可能是通过增加ADPN水平,增强AMPK活化,AMPK又激活eNOS的表达上调,从而减少ROS、8-OHdG、3-NT的表达,增加NO的表达,起到一定的保护肾组织的作用。
     结论:本实验研究结果说明,解毒通络保肾胶囊能降低实验性糖尿病大鼠的血糖,增加胰岛素水平,调节血脂异常,保护肾功能,增加DM大鼠血清ADPN水平、肾组织中ADPN蛋白及基因表达,减少肾组织中ROS、8-OHdG、3-NT等含量,抑制DM大鼠肾脏氧化应激反应,从而减轻肾组织的损害,延缓DM发展。
     本实验研究的创新点是完善解毒通络保肾治法学说,将DN氧化应激机制引入该治法的研究中,探讨ADPN及其受体系统调控DN氧化应激发病机制与中医毒损肾络病机理论的关系;将ADPN及其受体系统调控氧化应激机制应用于DN的研究是一种崭新的设想,可能成为防治DN的新靶点,为解毒通络保肾胶囊防治DN提供了新的思路和实验依据。
Propose:Diabetic nephropathy (called DN for short) is not only the most common andmultiple clinical diabetes mellitus (called DM for short) complications, but also the mostserious microvascular complications. DN contributes to glomerulopathy of mainlymicrovascular damage. The main pathology shows it increases the permeability of capillarybasement membrane, increases the thick of basement membrane, and accumulatesglomerular mesangial extracellular matrix (called ECM for short).These changes makeglomerulosclerosis, and eventually it becomes renal fibrosis. The early clinicalperformance is glomerular hypertrophy, glomerular hyper-filterability;the following changeis micro-albuminuria, persistent proteinuria, edema, hypertension;finally it cause toprogressive development of renal insufficiency, and to renal failure at last. The etiology andpathogenesis of DN is complex and due to the multiple factors and ways. Presently themedical treatment is reducing blood sugar, reducing blood pressure, and protecting renalfunction to delay DN progression. But there is a lack of effective means of prevention andtreatment, and most patients gradually developed into renal failure and life-threatening.
     In recent years, the theory of oxidative stress in DN pathogenesis becomes the focustheory, which provides a theoretical basis for antioxidant therapy in the DN. Since thediscovery of adiponectin, many studies confirmed that adiponectin is closely related to DMand DN. Adiponectin is not only anti-inflammatory, anti-atherogenic effect, but also hasantioxidant properties. The reduced adiponectin levels may lead to inhibit AMPK activation,thus inhibit AMPK activating to eNOS, cause NO reducing and ROS increasing,. Thesefactors cause the aggregation of ECM in the kidney,which cause to DN. Adiponectin mayregulate the oxidative stress mechanism.
     Methods:This experiment about the Chinese herbal medicine jie du tong luo bao shencapsule(called JJTLBS capsule for short) of prevention DN has been studied systematically.The emphasis is to discuss the relationship between poison damage kidney networkpathogenesis theory and oxidative stress, JJTLBS capsule and adiponectin, and todemonstrate the unique advantage of JJTLBS capsule in the treatment of DN. It also confirmsthe scientific nature of the treatment of detoxification, deoppilation meridian and securitykidney, clarify the pathogenesis of DN from the toxic damage to the kidney, oxidative stress, and adiponectin.
     This experiment explores protection mechanism of JJTLBS capsule towardsexperimental diabetic rat kidney, and relationship between mechanism and adiponectin bystudying the kidney oxidative stress mechanisms about JJTLBS capsule interfered theexperimental diabetic rat. The experiment also provide more comprehensive theoretical andexperimental basis to prevent and treat of DN to. The experiment is divided into four parts:
     1The experimental type2DM rat model was made with high-fat diet combined withstreptozotocin (called STZ for short). These models divided into the DM model group, thepositive control group, the experimental group and normal control group. Close observe thegeneral state of the diabetic rats.Detect blood biochemical indices, urine albumin, insulindetermination using enzyme-linked immunosorbent assay, biochemistry and otherexperimental techniques for studying protective effects of JJTLBS capsule towardsexperimental diabetic rat kidney
     2Detect fibronectin protein (FN) and type IV collagen (Col IV) by using theImmunohistochemistry assay in order to observe the ECM accumulation of JJTLBS capsuletowards experimental diabetic rat kidney. Observe the morphological changes of renal tissueby using light microscopy and transmission electron microscopy.
     3Detect protein expression of ADPN in serum and renal tissues, phosphorylationadenylate protein-activated protein kinase(p-AMPK),and endothelial nitric oxide enzymes(eNOS); gene expression of AdipoR1, AdipoR2and eNOS in renal tissue by using doubleantibody sandwich enzyme-linked immunosorbent assay(ELISA),immunohistochemistry,and fluorescence real-time quantitative PCR experiments to observe JJTLBS capsule towardsexperimental diabetic rat kidney.
     4Detect protein and gene expression of reactive oxygen species (ROS),8-hydroxy-deoxy guanosine (8-OHdG),3-nitro-casein nitrogen (3-NT) in renal tissuesby using ELISA technique to observe JJTLBS capsule towards experimental diabetic ratkidney.
     Results:
     1JJTLBS capsules can improve the general state of the experimental DM rats,decrease blood sugar, improve insulin levels and regulate dyslipidemia.
     2JJTLBS capsules can inhibit early renal hypertrophy and glomerular hyper-filtration state of the experimental DM rats,decrease urinary albumin excretion,which would protectrenal function.
     3JJTLBS capsules can inhibit the experimental DM rats morphological andultrastructural changes of rat kidney histopathology, decrease the expression of FN and ColIV in the renal tissue, decrease the ECM accumulation, which would reduce the DMglomerular sclerosis, prevent the renal fibrosis, delay the occurrence and development ofthe DN.
     4JJTLBS capsules can increase the serum adiponectin levels, adiponectin proteinexpression in renal tissue, AdipoR1, AdipoR2gene expression in renal tissue. While theexpression levels of AdipoR1is higher than AdipoR2.
     5JJTLBS capsules can increase p-AMPK protein expression in renal tissue. The geneand protein expression of eNOS were positively correlated towards adiponectin levels. Itconfirms that the increasing of adiponectin levels may enhance up-regulation the activation ofAMPK, while the AMPK active the up-regulation of eNOS.
     6the increased content of ROS,8-OHdG, and3-NT in the experimental DM ratssuggest that oxidative stress in kidneys play an important role in DN pathogenesis. Thecontent of ROS,8-OHdG and3-NT in kidney tissue is increased, which shows negativelycorrelated towards adiponectin levels in serum and kidney tissue. The results above showsthat the DN renal oxidative stress and adiponectin is known as the association.
     7JJTLBS capsules can obviously inhibit the kidney tissue content of ROS,8-OHdGand3-NT in the experimental DM rats. The pathogenesis of oxidative stress may perform likethis: it increased adiponectin levels,enhanced AMPK activation,and the activated AMPKmade the up-regulation of eNOS. Therefore, the expression of8-OHdG and3-NT werereduced and the expression of NO increased, which play a role in the protection kidneytissue.
     Conclusion:These results suggest that JJTLBS capsule can reduce the experimental DMrats blood glucose,increase insulin levels,regulate dyslipidemia and protect renal function,increased serum adiponectin levels, the protein and gene expression of adiponectin in renaltissue, reduce the content of ROS,8-OHdG and3-NT in renal tissue, and inhibit oxidativestress. Thus it would abatement the renal tissue damage, delay the DM development.
     The innovation of this experimental study is to improve the theory of detoxification, deoppilation meridian and security kidney, and introduce DN oxidative stress mechanism init. This experiment explore the relationship between DN oxidative stress in the pathogenesis,regulated by adiponectin and its receptors, and the TCM toxickidney by the theory ofpathogenesis. DN oxidative stress mechanism regulated by adiponectin and its receptors is anew idea,which may become a new target for treatment of DN,and provides new ideas andexperimental evidence when applying JJTLBS capsule for curing DN.
引文
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