Circulating neprilysin clears brain amyloid.

Circulating neprilysin clears brain amyloid.
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DOI:
10.1016/j.mcn.2010.05.014
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发表时间:
2010-10
影响因子:
3.5
通讯作者:
Hersh, Louis B.
Hersh, Louis B.
中科院分区:
医学3区
文献类型:
--
作者:
Liu, Yinxing;Studzinski, Christa;Beckett, Tina;Murphy, M. Paul;Klein, Ronald L.;Hersh, Louis B.

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使用肽酶脑啡肽酶(NEP)作为降低脑淀粉样蛋白负荷的治疗剂正受到越来越多的关注。我们先前已经证明,在阿尔茨海默病转基因小鼠模型中,后肢肌肉表面的NEP外周表达降低了脑淀粉样蛋白负荷。在这项研究中,我们现在表明,使用腺相关病毒表达可溶性分泌形式的NEP(secNEP-AAV 8),分泌到血浆中的NEP可有效清除脑Aβ。血浆中可溶性NEP的表达在测量的3个月时间内持续。分泌型NEP使血浆Aβ降低30%,可溶性脑Aβ降低约28%,不溶性脑Aβ降低约55%,Aβ寡聚体降低12%。这种secNEP不会改变血浆P物质或缓激肽的水平,也不会改变血压。在CSF中没有检测到NEP,AAV病毒也没有产生NEP的脑表达。因此,脑Aβ的降低是由于血浆NEP改变了血脑Aβ转运动力学。在血浆中表达NEP提供了在其治疗测试过程中监测酶活性的方便方法。
The use of the peptidase neprilysin (NEP) as a therapeutic for lowering brain amyloid burden is receiving increasing attention. We have previously demonstrated that peripheral expression of NEP on the surface of hindlimb muscle lowers brain amyloid burden in a transgenic mouse model of Alzheimer’s disease. In this study we now show that using adeno-associated virus expressing a soluble secreted form of NEP (secNEP-AAV8), NEP secreted into plasma is effective in clearing brain Aβ. Soluble NEP expression in plasma was sustained over the 3-month time period it was measured. Secreted NEP decreased plasma Aβ by 30%, soluble brain Aβ by ~28%, insoluble brain Aβ by ~55%, and Aβ oligomers by 12%. This secNEP did not change plasma levels of substance P or bradykinin, nor did it alter blood pressure. No NEP was detected in CSF, nor did the AAV virus produce brain expression of NEP. Thus the lowering of brain Aβ was due to plasma NEP which altered blood-brain Aβ transport dynamics. Expressing NEP in plasma provides a convenient way to monitor enzyme activity during the course of its therapeutic testing.
脑啡肽酶过度表达可抑制斑块形成,但不能减少人淀粉样前体蛋白转基因小鼠中的致病性 Abeta 寡聚体和相关认知缺陷。
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