在目的:探讨锰染毒大鼠大脑α-突触核蛋白的表达规律。方法:健康2月龄雄性SD大鼠50只.按体重随机分为A组(生理盐水组)、B组(Mn^2+ 2.5mg/kg)、C组(Mn^2+5mg/kg)、D组(Mn^2+10mg/kg)、E组(Mn^2+20mg/kg)。染毒30d后,取脑测定大鼠大脑中α-突触核蛋白的表达情况。实时荧光定量PCR(QT—PCR)检测大鼠脑组织中α-突触核蛋白mRNA的相对表达水平,Western—blot检测α-突触核蛋白蛋白的表达结果:B组、C组、D组和E组大鼠脑组织α-突触核蛋白mRNA的相对表达分别是A组的1.18、0.54、0.49和0.35倍。α-突触核蛋白表达用α-syn/GAPDH灰度值表示,结果显示α-突触核蛋白相对表达量,A、B、C、D和E组α-syn/GAPDH灰度值分别为0.32、1.33、0.71、0.54和0.57。与A组相比,B组α-突触核蛋白相对表达明显增加(P〈0.01)。结论:锰在低剂量的时候可以促进α-突触核蛋白的袁达聚集.
Objective To study α-synuelein expression changes induced by manganese (Mn2+) in rat brain. Methods Fifty 2-month-old male Sprague-Dawley(SD) rats are randomly divided into 5 groups: normal saline (A), Mn2+ 2.5 mg/kg (B), Mn2+ 5 mg/kg (C),Mn2+ 10 mg/kg (D),Mn2+ 20 mg/kg (E).'The animals were exposed to Mn2+ by intraperitionea[ injection at the dose of 0.5 mL/d for 30 days. α-synuclein mRNA and protein expression in rat brain were detected by real-time fluorescence quantitative PCR (QT-PCR) and western-blotting assay, respectively. Results QTPCR shows 1.18, 0.54, 0.49, and 0.35 fold increase of α-synuclein mRNA in group B, C, D, and E in compare with group A. Compared with the group A, α-synuclein protein was up-regulated significantly in the group B, C, D, and E (P 〈 0.05). Conclusion Low level of Mn2+ can efficiently promote α-synueleirl assembly.