枸杞多糖对皮肤光老化模型大鼠保护作用的尿液代谢组学研究

Study on the protective effect of lycium barbarum polysaccharide on light aging resistance in rats

目的 采用代谢轮廓和代谢靶向分析技术探讨枸杞多糖对皮肤光老化大鼠模型的保护作用机制,阐明其关键代谢通路及代谢靶点.方法 将大鼠按随机数字表法分为空白组、模型组、枸杞多糖组,每组8只.模型组与枸杞多糖组大鼠制备皮肤光老化模型.造模后1 d,枸杞多糖组灌胃枸杞多糖溶液10 mg/kg,空白组与模型组灌胃等体积生理盐水,1次/d,连续给药14 d.采用半自动生化分析仪检测皮肤组织羟脯氨酸水平,采用紫外分光光度法检测皮肤组织总超氧化物歧化酶、MDA水平.结合尿液代谢组学技术分析枸杞多糖抗皮肤光老化的作用机制,阐明其关键代谢通路及关键代谢靶点.结果 与模型组比较,枸杞多糖组大鼠总超氧化物歧化酶[（301.51±42.56）U/mg比（93.41±56.31）U/mg]活性、羟脯氨酸[（8.91±5.78）μg/mg比（4.74±1.54）μg/mg]含量升高（P〈0.05）,MDA[（8.54±6.41）nmol/mg比（21.31±6.58）nmol/mg]含量降低（P〈0.05）.尿液代谢组学结果显示,枸杞多糖可调节皮肤光老化过程中的多条代谢通路及关键代谢酶,如花生四烯酸、酪氨酸、牛磺酸、柠檬酸、马尿酸、L-半胱氨酸、肌醇、苏氨酸等.结论 大鼠皮肤光老化过程中,体内多条代谢通路发生紊乱,枸杞多糖可通过调节网络中的关键代谢酶发挥保护作用.

Objective To study the mechanism of the protective effect of lycium barbarum polysaccharide on light aging resistance rats by using the metabolic profile and metabolic target analysis technique.Methods Ultraviolet irradiation induced Wistar rats were induced to produce skin photo aging model and 24 rats were randomly divided into three groups, including control goup, model group, Lycium barbarum polysaccharide group （LBP）. After modeling for 24 hours, LBP group was conducted with Lycium barbarum polysaccharide solution of 10 mg/kg. Control group and model group were given same volume of stroke-physiological saline solution for 14 days. The biochemical indexes such as rat serum antioxidant activity of related substances and MDA were measured in model group and drug group; the urine metabolomics study was also investigated for the mechanism of lycium barbarum polysaccharide against light aging band.Results Compared with the model group, the LBP group rats total superoxide dismutase activity （301.51 ± 42.56 U/mgvs.93.41 ± 56.31 U/mg）, hydroxyproline （8.91 ± 5.78μg/mgvs.4.74 ± 1.54μg/mg） content significantly increased （P〈0.05）, but the malondialdehyde （8.54 ± 6.41 nmol/mgvs.21.31 ± 6.58 nmol/mg） decreased without any statistics difference （P〈0.05）. The urine metabonomics results showed that LBP could regulate the skin photoaging of multiple metabolic pathways and key metabolic enzymes in the process, such as peanut four acid, tyrosine, taurine, citric acid and hippuric acid, L-cysteine, inositol, threonine etc.Conclusions In the process of skin photoaging in rats, multiple metabolic pathways in vivo were disordered, and Lycium barbarum polysaccharide could play a protective role by regulating the key metabolic enzymes in the network.