天津医药 ›› 2017, Vol. 45 ›› Issue (3): 229-233.doi: 10.11958/20161334

• 细胞与分子生物学 • 上一篇    下一篇

肖沉 1,2, 孙莉 1,2∆, 曹杉杉 1,2, 梁浩 1,2, 程焱 1,2

肖沉 1,2, 孙莉 1,2?, 曹杉杉 1,2, 梁浩 1,2, 程焱 1,2   

  1. 1 天津医科大学总医院神经内科 (邮编 300052); 2 天津市神经病学研究所
  • 收稿日期:2016-11-15 修回日期:2017-02-13 出版日期:2017-03-15 发布日期:2017-03-21
  • 通讯作者: 孙莉 E-mail:lisun@tmu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目 (81571201, 81401023)

The inhibitory effect of PNS on brain 3-NT formation in vitro

XIAO Chen1,2, SUN Li1,2?, CAO Shan-shan1,2, LIANG Hao1,2, CHENG Yan1,2   

  1. 1 Department of Neurology, General Hospital of Tianjin Medical University, Tianjin 300052, China; 2 Tianjin Neurology Institute
  • Received:2016-11-15 Revised:2017-02-13 Published:2017-03-15 Online:2017-03-21
  • Contact: SUN Li E-mail:lisun@tmu.edu.cn

摘要: 摘要: 目的 研究三七总皂苷(PNS)对体外过氧化亚硝基离子(ONOO-)依赖途径和亚铁血红素-亚硝酸盐-过 氧化氢 (heme/NO2-/H2O2) 依赖途径诱导的脑组织 3-硝基酪氨酸 (3-NT) 形成的抑制作用。方法 依据体内 3-NT 形成的主要途径, 分别建立 heme/NaNO2/H2O2和 ONOO-诱导的 3-NT 形成体外模型; 分别以牛血清白蛋白 (BSA) /大鼠血浆蛋白、 大鼠脑组织匀浆蛋白为底物, 分为对照组、 模型组及低、 中、 高浓度干预组(PNS 终浓度分别为 50、 100 及200 mg/L), Western blot 法检测各组 3-NT 水平。结果 与对照组相比, 模型组 BSA、 血浆蛋白、 脑组织匀浆蛋白中均有 3-NT 形成 (均 P<0.05)。与模型组相比, 两种途径下, 加入不同浓度 PNS 后, BSA、 大鼠血浆蛋白中 3-NT 表达水平均降低 (均 P<0.05), 而低浓度干预组脑组织匀浆蛋白中 3-NT 降低不明显 (P>0.05), 中、 高浓度干预组脑组织匀浆蛋白 3-NT 水平降低明显, 且高浓度干预组作用最大 (均 P<0.05)。结论 中、 高浓度的 PNS 对脑组织 3-NT 形成具有抑制作用, PNS 可能对 3-NT 参与损伤机制的多种脑组织疾病 (如颅脑外伤、 脑卒中、 神经系统变性疾病等) 具有保护作用。

关键词: 脑损伤, 化学疗法, 辅助, 体外研究, 三七总皂苷, 3-硝基酪氨酸, 亚铁血红素, 过氧化亚硝基阴离子

Abstract: Abstract: Objective To study the inhibitory effect of panax notoginseng saponins (PNS) on 3-nitrotyrosine (3-NT) formation in brain induced by heme/NO2 -/H2O2 or ONOO - pathways in vitro. Methods According to the two major pathways of 3-NT formation in vivo, the models of protein nitration induced by heme/NaNO2/H2O2 or ONOO - system were established, respectively, in vitro. Bovine serum albumin (BSA)/rat plasma protein or rat brain homogenate protein were utilized as reactive substrates in both systems. Samples were divided into blank-control group, 3-NT group and PNS group(including low-, medium- and high-concentration subgroups). In 3-NT group, samples were exposed to heme /NaNO2 /H2O2 or ONOO- system, respectively, at 37 ℃ for 30 min, whereas in PNS group, samples were pre-incubated with PNS (at final concentrations of 50 mg/L, 100 mg/L, and 200 mg/L) at 37 ℃ for 5 min before the nitrating system exposure. The 3-NT level in each group was detected by Western blot assy. Results Compared with the blank-control group, both heme/NaNO2/H2O2 and ONOO- system can induce significant 3-NT generation in BSA/ rat plasma protein or rat brain homogenate protein (P<0.05). Compared with model group, PNS pre-treatment markedly inhibited 3-NT expression in BSA/rat plasma protein in a dose-dependent manner (P<0.05), the inhibitory effect of low intervention on the level of 3-NT in rat brain homogenate protein was not significant (P>0.05). Medium- and high-concentrations of PNS pre-treatment markedly inhibited 3-NT accumulation, with maximum effect at the concentration of 200 mg/L (P<0.05). Conclusion Medium- and highconcentrations of PNS can inhibit 3-NT formation in brain tissue mediated by either heme/NO2-/H2O2 or ONOO- pathways,implying that potential neuroprotective action against 3- NT involves pathological conditions, like trauma, stroke, and neurodegenerative diseases.

Key words: brain injuries, chemotherapy, adjuvant, in vitro, panax notoginseng saponins(PNS), 3-nitrotyrosine(3-NT), heme, peroxynitrite anion