目的:研究莫诺苷对氧化应急诱导的神经细胞凋亡的影响。方法:培养的人神经母细胞瘤(SH-SY5Y)神经细胞加入莫诺苷(1,10,100μmol·L^-1)预孵育24h,加入H2O2(500μmol·L^-1)作用18h诱导产生氧化损伤,测定对细胞内超氧化物歧化酶(SOD)活性的影响;用Westernblot方法检测caspase-3,caspase-9,Bcl-2和Bax的表达。结果:莫诺苷(10,100μmol·L^-1)抑制氧化损伤,与模型组相比,SOD活性分别增加了14%(P〈0.01)和11%(P〈0.05);莫诺苷(1,10,100μmol·L^-1)与模型组相比,caspase-3的含量分别减少了31%(P〈0.01),103%(P〈0.001)和95%(P〈0.001),caspase-9的含量分别减少了71%(P〈0.001),132%(P〈0.001)和37%(P〈0.05),Bcl-2分别增加了88%(P〈0.01),121%(P〈0.001)和60%(P〈0.01),对Bax没有影响。结论:莫诺苷可通过抗氧化作用抑制H2O2诱导的神经细胞凋亡,具有神经保护作用。
Objective: To investigate the effects of morroniside on H2O2-induced apoptosis in nerve cells. Method: Human neuroblastoma cell line SH-SYSY ceils were pre-incubaed with morroniside ( 1, 10, and 100 μmol·L^-1) for 24 h prior to exposure to H202(500μmol·L^-1) for 18 h. The activity of reactive SOD was measured by a biochemical assay. The expression of caspase-3, caspase- 9, Bcl-2 and Bax was determined by Wastern blotting method. Result: Pretreatment of the cells with morroniside ( 10 and 100μmol·L^-1 ) increasd SOD activity by 14% (P 〈0. 01 ) and 11% (P 〈0.05) in comparison with cells exposed only to H202. Morroniside ( 1, 10, 100μmol·L^-1) lowered caspase-3 level by 31% ( P 〈 0. 01 ), 103 % (P 〈 0. 001 ) and 95 % ( P 〈 0. 001 ), decreased caspase- 9 content by 71% (P 〈 0. 001 ), 132% (P 〈 0. 001 ) and 37% (P 〈 0. 05 ), and increasd Bcl-1 level by 88% (P 〈 0. 01 ), 121% (P 〈 0. 001 ) and 60% ( P 〈 0. 01 ) respectively but no significant change occurred in Bax level in comparison with cells exposed only to H2 02. Conclusion: Morroniside has neuroprotection effect against H2O2-induced oxidation injury in nerve cell.