KMID : 0545120170270112044
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Journal of Microbiology and Biotechnology 2017 Volume.27 No. 11 p.2044 ~ p.2051
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Effects of Newly Synthesized Recombinant Human Amyloid-¥â Complexes and Poly-Amyloid-¥â Fibers on Cell Apoptosis and Cognitive Decline
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Park Soo-Jin
Huh Jae-Won Eom Tae-Kil Park Na-Eun Lee Young-Jeon Kim Ju-Sung Kim Sun-Uk Shim In-Sop Lee Sang-Rae Kim E-Kyune
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Abstract
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The main pathological hallmark of Alzheimer¡¯s disease is the deposition of amyloid-beta (A¥â) peptides in the brain. A¥â has been widely used to mimic several aspects of Alzheimer¡¯s disease. However, several characteristics of amyloid-induced Alzheimer¡¯s disease pathology are not well established, especially in mice. The present study aimed to develop a new Alzheimer¡¯s disease model by investigating how A¥â can be effectively aggregated using prokaryotes and eukaryotes. To express the A¥â42 complex in HEK293 cells, we cloned the A¥â42 region in a tandem repeat and incorporated the resulting construct into a eukaryotic expression vector. Following transfection into HEK293 cells via lipofection, cell viability assay and western blotting analysis revealed that exogenous A¥â42 can induce cell death and apoptosis. In addition, recombinant His-tagged A¥â42 was successfully expressed in Escherichia coli BL21 (DE3) and not only readily formed A¥â complexes, but also inhibited the proliferation of SH-SY5Y cells and E. coli. For in vivo testing, recombinant His-tagged A¥â42 solution (3 ¥ìg/ ¥ìl in 1¡¿ PBS containing 1 mM Ni2+) was injected stereotaxically into the left and right lateral ventricles of the brains of C57BL/6J mice (n = 8). Control mice were injected with 1¡¿ PBS containing 1 mM Ni2+ following the same procedure. Ten days after the sample injection, the Morris water maze test confirmed that exogenous A¥â caused an increase in memory loss. These findings demonstrated that Ni2+ is capable of complexing the 50-kDa amyloid and that intracerebroventricular injection of A¥â42 can lead to cognitive impairment, thereby providing improved Alzheimer¡¯s disease models.
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KEYWORD
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Amyloid-beta, recombinant protein, apoptosis, exogenous A¥â42 complex
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