Data Availability StatementThe data used to aid the findings of this study are available from the corresponding author upon request. and losartan group (LG), with 8 rats in each group. On the first day of the experiment, rats in the NG were fed with ordinary Cfeed, while the other groups were fed with high-fat and high-sugar feed. On the 29th day, except the NG, the other 3 groups received a single intraperitoneal injection of streptozocin (STZ, 35?mg/kg). Fasting blood glucose (FBG) was assessed on the very first time, 32nd time, 46th time, 56th time, 84th time, PK11007 and 112th time. Total proteins/creatinine proportion of urine was dependant on the phenol reddish colored assay on the very first time and 112th time. Serum creatinine (Scr) was dependant on a computerized biochemical analyser in the 112th time. Kidneys were collected in the 112th time for evaluation and evaluation. Regular acid-Schiff (PAS) staining, hematoxylin-eosin (HE) staining, and transmitting electron microscopy were used to observe kidney pathological changes. The mRNA and protein expressions of Kelch-like ECH-associated protein 1 (Keap1) and nuclear factor-erythroid 2-related factor 2 (Nrf2) in renal tissues were detected by RT-qPCR, Western blot, and immunohistochemistry. Oxidative stress was evaluated by detecting the levels of malondialdehyde (MDA) and heme oxidase-1 (HO-1). The results showed that the content of asiaticoside, astragaloside, and triptolide in the herb was 5960, 809, and 2.42?(L.) Urb. (JiXueCao). Its extract, asiaticoside, has exhibited several pharmacological actions such as antihyperglycemic effects in obese diabetic rats [4], restoration of the activities of kidney enzymes involved in glucose and amino acid oxidation in diabetes, and protection diabetic tissues from stress via antioxidant mechanisms in the management of DKD [5]. Oxidative stress plays a key role in the pathogenesis of DKD. The kelch-like ECH-associated protein 1 (Keap1)-nuclear factor-erythroid 2-related factor PK11007 2 (Nrf2)-antioxidant response element (ARE) pathway is the most important endogenous antioxidant stress pathway [6]; so, in the present study, the relationship between Compound Centella and the molecular mechanism of the Keap1-Nrf2-ARE pathway will be deeply PK11007 explored, to supply a more experimental basis in Compound Centella for the treatment of DKD. 2. Materials and Methods 2.1. Drugs and Reagents Losartan potassium tablets were purchased (Merck Sharp & Dohme (Australia) Pty., Ltd, South Granville, Australia, import drug registration nos. H20160398 and H20160401); streptozocin (STZ) was purchased from Sigma Chemical Co., St. Louis, USA, CAS no. PCDH8 18883-66-4; Keap1 antibody was bought from Proteintech Group, Wuhan, China, no. 13161-1-ap; Nrf2 antibody was purchased from Proteintech Group, Wuhan, China, no. 16396-1-ap; heme oxidase-1 (HO-1) antibody was purchased from Proteintech Group, Wuhan, China, no. 10701-1-ap; the malondialdehyde (MDA) test box was purchased (Nanjing Jiancheng Bioengineering Institute, Nanjing, China, no. A003-1). Acetonitrile was purchased from Merck, Billerica, USA; asiaticoside reference was purchased from the National Institute for the Control of Pharmaceutical and Biological Products, Beijing, China; astragaloside reference was purchased from the National Institute for the Control of Pharmaceutical and Biological Products, Beijing, China; triptolide reference was purchased (content 98%, the National Institute for the Control of Pharmaceutical and Biological Products, Beijing, China). 2.2. Devices ABI 7900HT fluorescence quantitative PCR was purchased (Applied Biosystems, Foster City, USA); the Applied Biosystems LDZ 5-2 low-speed automatic balancing centrifuge was purchased (Beijing Jingli Co., Ltd., Beijing, China); the 5810R high-speed frozen centrifuge was bought (Eppendorf, PK11007 Hamburg, Germany); the Bio-tek ELX800 automatic microplate reader was purchased (Bio-Tek, Biotek Winooski, USA); the Yuyou type II (301) glucose meter was purchased form Yuyue Medical Devices & Supply Co., Ltd., Suzhou, China; ProStar 230 high-performance water chromatogram was bought from Varian, Palo Alto, USA; the BX 51 optical microscope was bought (Olympus, Tokyo, Japan); the JEM1400 transmitting electron microscope was bought (JEOL, Tokyo, Japan). 2.3. Pets and Experimental Style 32 male SPF Sprague-Dawley rats (4-5 weeks outdated; weighing 100??10?g) were purchased through the Shanghai Sippr-BK Lab Pet Co., Ltd. These rats had been bred by the pet centre lab of Zhejiang Chinese language Medical College or university (Zhejiang, China) using the experimental permit amount of SYXK (Zhejiang) 2018-0012. As well as the test was accepted by the Zhejiang Chinese language Medical University Pet Ethics Committee. All rats had been housed within a hurdle environment (temperatures, 20C25C; dampness, 50%65%; light, 12?h/d). The high-fat and high-sugar give food to contented 10% lard, 10% sucrose, 2.0% cholesterol, 0.5% cholic acid, 5% yolk powder, and 72.5% ordinary feed formula. The high-fat and high-sugar feed’s device calorie supply is certainly 3.95?kcal/g. The daily meals for every rat was about 2530?g. Daily calorie consumption was computed by multiplying the mass of daily PK11007 diet in grams with the physiological energy value of the dietary plan in kilocalories per gram. Therefore, the calories for every rat each day was about 98.75118.5?kcal. All Sprague-Dawley rats had been divided into the standard group (NG), DKD group (DKDG), Substance Centella group (CCG), and losartan group.