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首页> 外文期刊>Biochemistry >LONG AMYLOID BETA-PROTEIN SECRETED FROM WILD-TYPE HUMAN NEUROBLASTOMA IMR-32 CELLS
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LONG AMYLOID BETA-PROTEIN SECRETED FROM WILD-TYPE HUMAN NEUROBLASTOMA IMR-32 CELLS

机译:野生型人神经母细胞瘤IMR-32细胞分泌长淀粉样β-蛋白

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摘要

The 39- to 43-amino acid amyloid beta-protein (A beta) is deposited as amyloid in Alzheimer's disease. Recent studies have suggested that short A beta (A beta(39) or A beta(40)) and long A beta (A beta(42) or A beta(43)) play different roles in Alzheimer-type pathology. However, little attempt has been made to investigate the cellular mechanisms underlying the generation of short and long A beta individually. In the present report, we first measured the amount of short and long A beta that are secreted from wild-type human and rodent cells with neuron- or glia-like properties using highly sensitive sandwich-ELISAs that discriminate long A beta from short A beta. The results showed that long A beta secreted by all cells constitutes approximately 10% of the total A beta. To identify the molecular species of long A beta, we next isolated the A beta species secreted from human neuroblastoma IMR-32 cells by affinity chromatography, gel-filtration HPLC, and reverse-phase HPLC. Mass spectrometric analysis demonstrated unequivocally that IMR-32 cells produce A beta(1-42) together with A beta(1-37), A beta(1-38), A beta(1-39), and most predominantly, A beta(1-40). Finally, to investigate the cellular mechanisms that generate A beta(1-42), we studied the effects of brefeldin A and monensin on the production of A beta(1-40) and A beta(1-42) in IMR-32 cells. These reagents reduced the production of bath A beta(1-40) and A beta(1-42) simultaneously in a concentration-dependent manner. These results indicate that processing of wild-type amyloid precursor protein normally generates A beta(1-42) at a ratio of 10% to total A beta and that A beta(1-40) and A beta(1-42) share a common secretory mechanism that involves acidic compartments such as the late Golgi or early endosomes.
机译:39至43个氨基酸的淀粉样β蛋白(A beta)作为淀粉样蛋白沉积在阿尔茨海默氏病中。最近的研究表明,短的A beta(A beta(39)或A beta(40))和长的A beta(A beta(42)或A beta(43))在阿尔茨海默病类型的病理中起不同的作用。但是,几乎没有人尝试研究短和长A beta分别产生的细胞机制。在本报告中,我们首先使用高度敏感的夹心ELISA来测量从长型Abeta和短型Abeta区分的野生型人和具有神经元或神经胶质样特性的啮齿动物细胞分泌的短和长型Abeta的量。 。结果表明,所有细胞分泌的长A beta约占总A beta的10%。为了鉴定长A beta的分子种类,我们接下来通过亲和色谱,凝胶过滤HPLC和反相HPLC分离了人类神经母细胞瘤IMR-32细胞分泌的A beta种类。质谱分析明确表明,IMR-32细胞与A beta(1-37),A beta(1-38),A beta(1-39)和最主要的A beta一起产生A beta(1-42) (1-40)。最后,为了研究产生A beta(1-42)的细胞机制,我们研究了布雷菲德菌素A和莫能菌素对IMR-32细胞中A beta(1-40)和A beta(1-42)产生的影响。这些试剂以浓度依赖性方式同时减少了浴液A beta(1-40)和A beta(1-42)的产生。这些结果表明,野生型淀粉样蛋白前体蛋白的加工通常以相对于总A beta的10%的比例生成A beta(1-42),并且A beta(1-40)和A beta(1-42)共享一个常见的分泌机制涉及酸性区室,例如高尔基晚期或早期内体。

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