Nrf2 mediates the expression of BAG3 and autophagy cargo adaptor proteins and tau clearance in an age-dependent manner.

Nrf2 mediates the expression of BAG3 and autophagy cargo adaptor proteins and tau clearance in an age-dependent manner.
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DOI:
10.1016/j.neurobiolaging.2017.12.001
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发表时间:
2018-03
影响因子:
4.2
通讯作者:
Johnson GVW
Johnson GVW
中科院分区:
医学2区
文献类型:
--
作者:
Tang M;Ji C;Pallo S;Rahman I;Johnson GVW

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在衰老过程中,脑中核因子E2相关因子2(Nrf 2)激活和自噬过程的效率降低可能是神经退行性疾病(如阿尔茨海默病)发病机制的一个促成因素。因此,我们分析了BAG 3(一种介导自噬的辅助分子伴侣)以及自噬衔接子NBR 1、NDP 52和SQSTM 1/p62在4、8和12个月大的野生型和Nrf 2敲除(−/−)小鼠大脑中的表达。我们还分析了总tau以及磷酸化tau种类的水平。在4个月大的动物中,自噬相关基因或tau种类的表达差异很小,然而到12个月大时,所有这些自噬相关基因在Nrf 2(−/−)小鼠中的表达水平都显着降低。自噬相关基因的减少伴随着12个月Nrf 2(−/−)大脑中磷酸化tau物质水平的显著升高。这些发现表明,自噬相关基因的Nrf 2调节可能在介导tau随着生物体年龄的增加而清除方面发挥更大的作用。
During aging, decreased efficiency of nuclear factor E2-related factor 2 (Nrf2) activation and autophagic processes in the brain may be a contributing factor in the pathogenesis of neurodegenerative diseases such as Alzheimer’s disease. Therefore, we analyzed the expression of BAG3, a co-chaperone that mediates autophagy, and the autophagy adaptors NBR1, NDP52 and SQSTM1/p62 in the brains of 4, 8 and 12 month old wild-type and Nrf2 knockout (−/−) mice. We also analyzed the levels of total tau, as well as phospho-tau species. There were minimal differences in the expression of autophagy-related genes or tau species in 4 month old animals, however by 12 months all of these autophagy-associated genes were expressed at significantly lower levels in the Nrf2(−/−) mice. The decreases in the autophagy associated genes was accompanied by significantly elevated levels of phospho-tau species in the 12 month Nrf2(−/−) brains. These findings indicate that Nrf2 regulation of autophagy-related genes likely plays a greater role in mediating the clearance of tau as an organism ages.
神经元中的自噬诱导和自噬体清除:与阿尔茨海默氏病自噬病理学的关系。
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