Sodium Chloride Increases Aβ Levels by Suppressing Aβ Clearance in Cultured Cells.

Sodium Chloride Increases Aβ Levels by Suppressing Aβ Clearance in Cultured Cells.
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DOI:
10.1371/journal.pone.0130432
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Cheng XD
Cheng XD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cheng XJ;Gao Y;Zhao YW;Cheng XD

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最近的研究表明,高盐饮食与人类和小鼠的认知能力下降有关。散发性阿尔茨海默病(AD)的遗传因素占不到50%,这一事实凸显了高盐饮食等环境因素在AD发病中的重要作用。然而,高盐饮食是否以及如何符合“淀粉样蛋白级联”假说仍未被探索。在此,我们发现氯化钠(NaCl)可以增加过表达淀粉样蛋白前体蛋白(APP)或C99片段的HEK293细胞中的Aβ水平。NaCl处理不影响APP水平、γ分泌酶水平和活性。相反,NaCl处理抑制了细胞清除Aβ的能力,降低了载脂蛋白E (ApoE)水平。最后,NaCl处理的THP-1或BV2细胞与大鼠原代神经元共培养时,对Aβ的清除效率不高。我们的研究表明,高盐饮食可能通过直接调节Aβ水平而增加AD风险。
Recent studies suggest that high-salt diet is associated with cognitive decline in human and mouse. The fact that genetic factors account for less than 50% cases of sporadic Alzheimer’s disease (AD) highlights the important contribution of environmental factors, such as high-salt diet, in AD pathogenesis. However, whether and how high-salt diet fits the “amyloid cascade” hypothesis remains unexplored. Here, we show sodium chloride (NaCl) could increase Aβ levels in the medium of HEK293 cells overexpressing amyloid precursor protein (APP) or C99 fragment. NaCl treatment dose not affect APP level, gamma secretase level or activity. Instead, NaCl treatment suppresses the capacity of cells to clear Aβ and reduces Apolipoprotein E (ApoE) level. Finally, NaCl treated THP-1 or BV2 cells are inefficient in clearing Aβ when co-cultured with rat primary neurons. Our study suggests that high-salt diet may increase AD risk by directly modulating Aβ levels.
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