The protective effect of growth hormone on Cu/Zn superoxide dismutase-mutant motor neurons.

The protective effect of growth hormone on Cu/Zn superoxide dismutase-mutant motor neurons.
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DOI:
10.1186/s12868-015-0140-z
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发表时间:
2015-02-06
期刊:
影响因子:
2.4
通讯作者:
Kim M
Kim M
中科院分区:
医学4区
文献类型:
--
作者:
Chung JY;Kim HJ;Kim M

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肌萎缩侧索硬化症(ALS)的特征是运动神经元的选择性变性。编码铜/锌超氧化物歧化酶 (SOD1) 的基因与 20% 的家族性 ALS 病例有关。 ALS 患者脑脊液中生长激素 (GH) 浓度较低;然而,它与运动神经元死亡的关系尚不清楚。我们测试了 GH 对表达人类 SOD-1 的培养运动神经元和 SOD1G93A 转基因小鼠的神经保护作用。在培养的运动神经元中,A23187、GNSO 或同型半胱氨酸诱导细胞毒性,并通过 MTT、bax、PARP 裂解模式、Hoechst 核染色、MAPK 和 PI3K 测定确定 GH 的作用。在 SOD-1 转基因小鼠中,评估了转棒运动性能。使用甲酚紫、GFAP 和 Bcl-2 染色进行运动神经元损失的生存分析。 GH 可以防止 GSNO 和同型半胱氨酸引起的运动神经元死亡,但不能防止 A23187 引起的运动神经元死亡。它激活 MAPK 和 PI3K。接受 GH 治疗的小鼠表现出更长的生存期、运动性能改善和体重减轻。 GH 通过强 Bcl-2 和较低 GFAP 免疫反应性减少甲酚紫阳性运动神经元损失。我们的结果表明 GH 对表达突变型 SOD-1 的运动神经元具有保护作用。
Amyotrophic lateral sclerosis (ALS) is characterized by selective degeneration of motor neurons. The gene encoding Cu/Zn superoxide dismutase (SOD1) is responsible for 20% of familial ALS cases. Growth hormone (GH) concentrations are low in the cerebrospinal fluid of patients with ALS; however, its association with motoneuronal death is not known. We tested the neuroprotective effects of GH on human SOD-1-expressing cultured motor neurons and SOD1G93A transgenic mice. In cultured motor neurons, cytotoxicity was induced by A23187, GNSO, or homocysteine, and the effects of GH were determined by MTT, bax, PARP cleavage pattern, Hoechst nuclear staining, MAPK, and PI3K assay. In SOD-1 transgenic mice, rotarod motor performance was evaluated. Survival analysis of motoneuronal loss was done using cresyl violet, GFAP, and Bcl-2 staining. GH prevents motorneuronal death caused by GSNO and homocysteine, but not that by A23187. It activates MAPK and PI3K. GH-treated mice showed prolonged survival with improved motor performance and weight loss. GH decreased cresyl violet positive motoneuronal loss with strong Bcl-2 and less GFAP immunoreactivity. Our results demonstrate that GH has a protective effect on mutant SOD-1-expressing motor neurons.
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发表时间: 2006-12-01
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