柠檬酸铁胺对SH-SY5Y细胞中葡萄糖脑苷脂酶活性及其蛋白表达的影响
2020-06-08陈兵兵宓晓晴李云谢俊霞宋宁
陈兵兵 宓晓晴 李云 谢俊霞 宋宁

[摘要] 目的 探究柠檬酸铁胺(FAC)对SH-SY5Y多巴胺能细胞系葡萄糖脑苷脂酶(GCase)活性及其蛋白表达的影响。方法 用FAC、GCase活性抑制剂环己烯四醇环氧化物(CBE)分别或共同处理细胞48 h,应用荧光法检测GCase活性,免疫印迹法检测GCase蛋白表达。结果 FAC和CBE两种因素共处理,对GCase活性及其蛋白表达的影响不存在交互作用(P>0.05)。FAC处理SH-SY5Y细胞后,GCase活性降低,蛋白表达升高,与对照组比较差异具有统计学意义(F=8.191、4.934,P<0.05);CBE处理SH-SY5Y细胞后,GCase活性降低,蛋白表达升高,与对照组比较差异具有统计学意义(F=14.605、4.182,P<0.05)。结论 高铁可降低SH-SY5Y细胞中GCase的活性,升高蛋白的表达。
[关键词] 铁;柠檬酸盐类;葡糖苷酰鞘氨醇酶;SH-SY5Y细胞
[中图分类号] R338.1;R345.62 [文献标志码] A [文章编号] 2096-5532(2020)02-0143-04
doi:10.11712/jms.2096-5532.2020.56.058 [开放科学(资源服务)标识码(OSID)]
[网络出版] http://kns.cnki.net/kcms/detail/37.1517.R.20200407.0930.004.html;2020-04-07 14:57
[ABSTRACT] Objective To explore the effect of ferric ammonium citrate (FAC) on glucocerebrosidase (GCase) activity and expression in SH-SY5Y dopaminergic cells. Methods SH-SY5Y dopaminergic cells were treated with FAC and the GCase inhibitor conduritol B epoxide (CBE), alone or in combination, for 48 h. Fluorometric assay was used to determine the GCase acti-vity. Western blotting was performed to determine the expression level of GCase. Results When FAC and CBE were used in combination to treat the SH-SY5Y cells, there was no interaction between them with regard to the effect on GCase activity and expression (P>0.05). SH-SY5Y cells treated with FAC alone showed a significantly decreased GCase activity and a significantly increased GCase expression level compared with the control group (F=8.191,4.934,P<0.05); SH-SY5Y cells treated with CBE alone also showed a significantly decreased GCase activity and a significantly increased GCase expression level compared with the control group (F=14.605,4.182,P<0.05). Conclusion High level of iron can decrease the activity and increase the expression level of GCase in SH-SY5Y cells.
[KEY WORDS] iron; citrates; glucosylceramidase; SH-SY5Y cells
近年来遗传基因的发现为家族性和散发性帕金森病(PD)的发病机制提供新见解,有5%~10%的PD病例是遗传因素所致[1-2]。临床研究发现,PD病人中编码葡萄糖脑苷酯酶(GCase)的基因GBA突变率达20%,因此GBA突變是目前已知的PD和相关突触核蛋白病发展的最常见的遗传危险因素[3-5]。GCase是一种具有497个氨基酸的膜相关性蛋白,该蛋白在内质网中合成和经糖基化修饰后,被溶酶体膜整合蛋白-2转运至溶酶体中,发挥生物学功能[6]。GCase活性的降低可以导致葡萄糖神经酰胺的聚积,进而导致戈谢病的发生[7]。在PD中,GBA突变降低了GCase的活性,导致α-突触核蛋白聚集,而聚集的α-突触核蛋白又进一步促进了GCase活性的降低,形成恶性循环,造成多巴胺能神经元的死亡,因此GCase的活性与PD的发病进程密切相关[8-12]。铁是PD发病的重要因素之一[13],铁可以诱导氧化应激和铁死亡等[14-16],从而造成多巴胺能神经元的选择性损伤。然而……
