Protection against DSP-4-induced neurotoxicity by deprenyl is not related to its inhibition of MAO B.

Protection against DSP-4-induced neurotoxicity by deprenyl is not related to its inhibition of MAO B.
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丙炔苯丙胺对 DSP-4 诱导的神经毒性的保护与其对 MAO B 的抑制无关。

DOI:
10.1016/0014-2999(90)90672-s
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发表时间:
1990
影响因子:
5
通讯作者:
Langston,JW
Langston,JW
中科院分区:
医学2区
文献类型:
--
作者:
Finnegan,KT;Skratt,JJ;Irwin,I;DeLanney,LE;Langston,JW

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临床研究表明,丙炔苯丙胺可能会延缓帕金森病的进展,这种作用可能与其单胺氧化酶(MAO)抑制特性有关。丙炔苯丙胺还可防止去甲肾上腺素能毒素DSP-4的神经退行性作用。在这项研究中,我们研究了单胺氧化酶B抑制在这种保护中的作用。将C57 BL/6小鼠给予DSP-4(50 mg/kg i. p.)在给予丙炔苯丙胺(10 mg/kg i. p.)后1 h、24 h或4天,或选择性单胺氧化酶(MAO)B抑制剂MDL 72974(1.25 mg/kg),1周后处死,测定海马去甲肾上腺素含量。在这些相同的时间间隔后,还测定了丙炔苯丙胺或MDL 72974的MAO B抑制作用。丙炔苯丙胺和MDL 72974在给药后1小时(> 95%)、24小时(> 90%)或4天(> 70%)产生相当程度的酶抑制。给予1小时前,丙炔苯丙胺完全阻断DSP-4的去甲肾上腺素消耗作用,但这种保护急剧下降时,丙炔苯丙胺和DSP-4之间的24小时或4天的时间间隔。MDL 72974在任何时间点均未能保护。在体外,我们使用DSP-4作为MAO的底物没有检测到活性。这些发现表明,丙炔苯丙胺防止DSP-4诱导的神经元变性的能力可能不依赖于其MAO B抑制特性。
Clinical studies suggest that deprenyl may retard the progression of Parkinson's disease, an effect that may be related to its monoamine oxidase (MAO) inhibiting properties. Deprenyl also protects against the neurodegenerative effects of the noradrenergic toxin DSP-4. In this study we investigated the role of MAO B inhibition in this protection. C57BL/6 mice were given DSP-4 (50 mg/kg i.p.) 1 h, 24 h or 4 days after the administration of deprenyl (10 mg/kg i.p.) or the selective MAO B inhibitor MDL 72974 (1.25 mg/kg), and then killed 1 week later for assay of hippocampal norepinephrine. The MAO B inhibiting effects of deprenyl or MDL 72974 were also determined after these same intervals of time. Deprenyl and MDL 72974 produced comparable degrees of enzyme inhibition 1 h (> 95%), 24 h (> 90%) or 4 days (> 70%) after their administration. Given 1 h before, deprenyl totally blocked the norepinephrine-depleting effects of DSP-4, but this protection declined sharply when 24 h or 4 days was allowed to elapse between deprenyl and DSP-4 administration. MDL 72974 failed to protect at any time point. In vitro, we detected no activity using DSP-4 as a substrate for MAO. These findings suggest that the ability of deprenyl to protect against DSP-4-induced neuronal degeneration may not depend on its MAO B inhibiting properties.
DOI: --
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