The inhibitory effect of lotus leaf extract on hyperuricemia and its potential mechanism

Objective:Lotus leaf is a traditional Chinese herb that has been used successfully for centuries for relieving edema by inducing diuresis.Based on its good clinical evidence and anti-hypertensive effectiveness,this study aimed to investigate the potential mechanism of the hyperuricemic inhibitory effects of lotus leaf crude extract(LL)and lotus leaf total alkaloids fraction(LA).Methods:The xanthine oxidase(XOD)inhibitory effect of LL and LA was analyzed in vitro by determining mRNA expression and protein expression levels of hepatic XOD.The hyperuricemic inhibitory effect of the lotus leaf was analyzed in vivo in a potassium oxonate(PO)-induced rat model by determining mRNA expression for renal urate transporters.Results:At a concentration of 40mg/mL,LL and LA suppressed XOD enzymatic activity by 37.35%±9.50%and 47.73%±8.32%,respectively.Both LL and LA administration significantly reduced the concentration of uric acid in the serum and liver of PO-induced hyperuricemic rats.Both LL and LA administration could inhibit XOD mRNA and protein expression,activate renal organic anion transporter 1/3 mRNA expression,and inhibit renal urate reabsorption by decreasing renal GLUT9 and renal urate transporter 1.Conclusions:Insight was gained into the mechanism behind the hyperuricemic inhibitory effects of LL and LA.Our results suggest that they act on two targets:decreasing the production of uric acid by inhibiting mRNA and protein expression of XOD in the liver,and regulating the mRNA expression of renal urate transporters in the kidneys.

高尿酸血症的发病机制与药物治疗研究进展

高尿酸血症是由于嘌呤代谢紊乱使尿酸生成增多和(或)排泄减少所致的代谢性疾病。高尿酸血症不仅是引起痛风的重要生化基础,而且与高血压、高脂血症、动脉粥样硬化、肥胖、胰岛素抵抗的发生密切相关。因此,针对其发病机制和药物治疗的研究已成为关注热点。本文阐述了高尿酸血症的发病机制,并从抑制尿酸合成与促进尿酸排泄两个方面介绍了相关药物治疗的研究进展。

壳寡糖复合固体饮料对高尿酸血症小鼠的降尿酸作用研究

为探究壳寡糖复合固体饮料“壳酸平”(ke suan ping,KSP)在高尿酸血症小鼠中的降尿酸及肝肾保护作用,该研究将60只昆明小鼠分为6组:阴性对照组(negative group,NC)、高尿酸血症模型组(model group,M)、低剂量KSP组(low-dose KSP group,LKSP)、中剂量KSP组(middle-dose KSP group,MKSP)、高剂量KSP组(high-dose KSP group,HKSP)、别嘌呤醇组(allopurinol group,AP)。适应性喂养1周后,通过腹腔注射氧嗪酸钾辅以灌胃酵母膏建立了高尿酸血症模型小鼠,同时更换KSP组小鼠饲料为含不同剂量KSP的饲料,AP组在造模1 h以后给药。收集小鼠血清用于尿酸、肌酐、尿素氮、黄嘌呤氧化酶的检测;收集小鼠肝、肾、肠用于苏木精-伊红染色法(hematoxylin-eosin staining,HE染色)和q-PCR。结果显示,与M组相比,KSP可以降低高尿酸血症小鼠血清尿酸、肌酐、尿素氮、黄嘌呤氧化酶活性,缓解高尿酸血症小鼠肝肾损伤,调节GLUT9、URAT1、ABCG2蛋白转录水平的表达。研究证明KSP可以通过降低黄嘌呤氧化酶的活性促进尿酸排泄等发挥降尿酸作用。