Macrophage migration inhibitory factor as a chaperone inhibiting accumulation of misfolded SOD1.

Macrophage migration inhibitory factor as a chaperone inhibiting accumulation of misfolded SOD1.
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DOI:
10.1016/j.neuron.2015.02.034
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发表时间:
2015-04-08
期刊:
影响因子:
16.2
通讯作者:
Cleveland, Don W.
Cleveland, Don W.
中科院分区:
医学1区
文献类型:
--
作者:
Israelson, Adrian;Ditsworth, Dara;Sun, Shuying;Song, SungWon;Liang, Jason;Hruska-Plochan, Marian;McAlonis-Downes, Melissa;Abu-Hamad, Salah;Zoltsman, Guy;Shani, Tom;Maldonado, Marcus;Bui, Anh;Navarro, Michael;Zhou, Huilin;Marsala, Martin;Kaspar, Brian K.;Da Cruz, Sandrine;Cleveland, Don W.

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超氧化物歧化酶(SOD 1)的突变导致肌萎缩侧索硬化(ALS),这是一种神经退行性疾病,其特征在于运动神经元的丧失,并伴随着错误折叠的SOD 1积聚到细胞内细胞器(包括线粒体和内质网(ER))的细胞质面上。使用错误折叠的SOD 1沉积到线粒体上的抑制作为测定,在非神经元组织中丰富的分子伴侣活性现在被纯化并鉴定为多功能巨噬细胞迁移抑制因子(MIF),其活性包括ATP非依赖性蛋白折叠分子伴侣。纯化的MIF显示直接抑制突变体SOD1错误折叠。神经元细胞中MIF升高抑制了错误折叠的SOD1的积累及其与线粒体和ER的关联,并延长了表达突变型SOD1的运动神经元的存活。累积的MIF蛋白被鉴定为在运动神经元中是低的,暗示相应地低的伴侣蛋白活性作为对突变体SOD1错误折叠的脆弱性的组分,并支持增强细胞内MIF伴侣蛋白活性的疗法。
Mutations in superoxide dismutase (SOD1) cause amyotrophic lateral sclerosis (ALS), a neurodegenerative disease characterized by loss of motor neurons and accompanied by accumulation of misfolded SOD1 onto the cytoplasmic faces of intracellular organelles, including mitochondria and endoplasmic reticulum (ER). Using inhibition of misfolded SOD1 deposition onto mitochondria as an assay, a chaperone activity abundant in non-neuronal tissues is now purified and identified to be the multifunctional macrophage migration inhibitory factor (MIF), whose activities include an ATP-independent protein folding chaperone. Purified MIF is shown to directly inhibit mutant SOD1 misfolding. Elevating MIF in neuronal cells suppresses accumulation of misfolded SOD1 and its association with mitochondria and ER and extends survival of mutant SOD1-expressing motor neurons. Accumulated MIF protein is identified to be low in motor neurons, implicating correspondingly low chaperone activity as a component of vulnerability to mutant SOD1 misfolding and supporting therapies to enhance intracellular MIF chaperone activity.
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