Hypomorphic Apolipoprotein E Mice

Hypomorphic Apolipoprotein E Mice
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亚形性载脂蛋白E小鼠

DOI:
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发表时间:
2002
影响因子:
4.8
通讯作者:
K. Weisgraber
K. Weisgraber
中科院分区:
生物学2区
文献类型:
--
作者:
R. Raffaı̈;K. Weisgraber

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在创建类似人类载脂蛋白E4 (apoE4)的小鼠apoE等位基因变体的过程中,我们产生了在所有组织中仅表达正常apoE mRNA水平约5%的亚形态apoE (hypoE)小鼠。在Apoe的第三个内含子中插入带有loxP位点的aneo盒,降低了低e小鼠中Arg-61等位基因变体的表达,并导致血浆Apoe水平降至正常水平的2-5%。与其他循环载脂蛋白e水平较低的小鼠模型不同,低载脂蛋白e小鼠在喂食鼠粮时具有接近正常的脂蛋白胆固醇谱。在低e / apoE−/−杂合小鼠中,apoE表达的进一步降低导致残余脂蛋白相关胆固醇水平的增加,这表明低e小鼠表达的Arg-61 apoE接近正常脂蛋白谱所需的阈值水平。与野生型小鼠不同,低e小鼠易患饮食诱导的高胆固醇血症,在恢复饮食后3周内完全逆转。在Mx1-Cre转基因hypoE小鼠中,在Cre重组酶诱导下进行基因修复并去除neo盒后10天内,血浆apoE水平恢复正常。通过与诱导型或谱系/细胞类型特异性的Cre转基因小鼠杂交,HypoE小鼠提供了条件性基因修复的机会,产生了新的模型来解剖apoE在动脉粥样硬化消退、免疫调节和神经变性中的作用。
In creating an allelic variant of mouseApoe designed to resemble human apolipoprotein E4 (apoE4), we generated hypomorphic apoE (hypoE) mice that express only ∼5% of normal apoE mRNA levels in all tissues. Insertion of aneo cassette flanked by loxP sites in the third intron of Apoe reduced expression of the Arg-61 allelic variant in hypoE mice and resulted in plasma apoE levels that were ∼2–5% of normal. Unlike other mouse models with low levels of circulating apoE, hypoE mice had a nearly normal lipoprotein cholesterol profile when fed a chow diet. Further reduction of apoE expression in hypoE/Apoe −/− heterozygous mice led to an increase in remnant lipoprotein-associated cholesterol levels, demonstrating that hypoE mice express close to the threshold level of Arg-61 apoE required for a normal lipoprotein profile. Unlike wild type mice, hypoE mice were susceptible to diet-induced hypercholesterolemia, which was fully reversed within 3 weeks after resumption of a chow diet. In Mx1-Cre transgenic hypoE mice, plasma apoE levels returned to normal within 10 days after gene repair and removal of the neo cassette following induction of Cre recombinase. HypoE mice provide the opportunity for conditional gene repair by crossing with inducible or lineage/cell type-specific Cre transgenic mice, generating new models to dissect the roles of apoE in atherosclerosis regression, immunoregulation, and neurodegeneration.
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