Quantitation of apoE Domains in Alzheimer Disease Brain Suggests a Role for apoE in Aß Aggregation

Quantitation of apoE Domains in Alzheimer Disease Brain Suggests a Role for apoE in Aß Aggregation
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阿尔茨海默病大脑中 apoE 结构域的定量表明 apoE 在 Aß 聚集中的作用

DOI:
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发表时间:
2001
影响因子:
3.2
通讯作者:
G. Rebeck
G. Rebeck
中科院分区:
医学4区
文献类型:
--
作者:
H. Cho;B. Hyman;Steven M. Greenberg;G. Rebeck

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载脂蛋白E (apoE)和载脂蛋白E衍生的蛋白水解片段存在于阿尔茨海默病(AD)和脑淀粉样血管病(CAA)的淀粉样沉积物中。在这项研究中,我们检查了哪些载脂蛋白e片段与淀粉样蛋白沉积最密切相关,以及载脂蛋白e受体结合域是否存在。我们发现apoE2-和apoe4特异性残基都存在于AD和CAA的斑块和血管上。我们量化了5例阿尔茨海默病脑内的血小板负荷和载脂蛋白e斑块负荷。ApoE n端特异性抗体和c端特异性抗体分别覆盖50%和74%的ß斑块负荷(p < 0.003)。双标记表明,空斑核心包含整个apoE蛋白,但外部区域仅包含一个c端片段,提示apoE的随机线圈区域有切割。免疫印迹法证实脑提取物中存在N端和c端apoE裂解片段。apoE n端特异性抗体和apoE c端特异性抗体鉴定的斑块数量相等,但仅占总斑块数量的约60% (p < 0.0001)。对ase和apoE沉积物的大小分布分析表明,Aß阳性和apoE阴性沉积物以最小的面积(小于150 μm2)居多。这些数据表明,apoE的c端残基与asas结合,apoE可能有助于小asas沉积向大asas沉积的进展。此外,淀粉样蛋白沉积中心的载脂蛋白e受体结合域的存在可能通过与细胞表面载脂蛋白e受体的慢性相互作用影响周围细胞。
Apolipoprotein E (apoE) and apoE-derived proteolytic fragments are present in amyloid deposits in Alzheimer disease (AD) and cerebral amyloid angiopathy (CAA). In this study, we examined which apoE fragments are most strongly associated with amyloid deposits and whether apoE receptor binding domains were present. We found that both apoE2- and apoE4-specific residues were present on plaques and blood vessels in AD and CAA. We quantified Aß plaque burden and apoE plaque burdens in 5 AD brains. ApoE N-terminal-specific and C-terminal-specific antibodies covered 50% and 74% of Aß plaque burden, respectively (p < 0.003). Double-labeling demonstrated that the plaque cores contained the entire apoE protein, but that outer regions contained only a C-terminal fragment, suggesting a cleavage in the random coil region of apoE. Presence of N- and C-terminal apoE cleavage fragments in brain extracts was confirmed by immunoblotting. The numbers of plaques identified by the apoE N-terminal-specific antibodies and the apoE C-terminal-specific antibody were equal, but were only approximately 60% of the total Aß plaque number (p < 0.0001). Analysis of the size distribution of Aß and apoE deposits demonstrated that most of the Aß-positive, apoE-negative deposits were the smallest deposits (less than 150 μm2). These data suggest that C-terminal residues of apoE bind to Aß and that apoE may help aid in the progression of small Aß deposits to larger deposits. Furthermore, the presence of the apoE receptor binding domain in the center of amyloid deposits could affect surrounding cells via chronic interactions with cell surface apoE receptors.
DOI: 10.1073/pnas.90.5.1977
发表时间: 1993-03-01
影响因子: 11.1
作者:
STRITTMATTER, WJ;SAUNDERS, AM;ROSES, AD
通讯作者: ROSES, AD
DOI: 10.1073/pnas.90.20.9649
发表时间: 1993-10-15
影响因子: 11.1
作者:
SCHMECHEL, DE;SAUNDERS, AM;ROSES, AD
通讯作者: ROSES, AD
DOI: 10.1016/s0065-3233(08)60642-7
发表时间: 1994
影响因子: --
作者:
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通讯作者: K. Weisgraber
DOI: 10.1016/0169-328x(91)90111-a
发表时间: 1991-09
期刊: Brain research. Molecular brain research
影响因子: --
作者:
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通讯作者: J. Poirier;M. Hess;P. May;C. Finch
阿尔茨海默病是载脂蛋白 E 淀粉样变性吗?
DOI: 10.1016/s0140-6736(95)90701-7
发表时间: 1995
期刊: Lancet (London, England)
影响因子: --
作者:
Wisniewski,T;Lalowski,M;Golabek,A;Vogel,T;Frangione,B
通讯作者: Frangione,B