NRF2 Loss Accentuates Parkinsonian Pathology and Behavioral Dysfunction in Human α-Synuclein Overexpressing Mice

被引:43
作者
Anandhan, Annadurai [1 ,2 ]
Nhat Nguyen [3 ]
Syal, Arjun [4 ]
Dreher, Luke A. [5 ]
Dodson, Matthew [1 ]
Zhang, Donna D. [1 ]
Madhavan, Lalitha [2 ,6 ,7 ]
机构
[1] Univ Arizona, Pharmacol & Toxicol, Tucson, AZ 85724 USA
[2] Univ Arizona, Dept Neurol, Tucson, AZ 85724 USA
[3] Physiol Undergrad Program, Tucson, AZ USA
[4] Neurosci & Cognit Sci Undergrad Program, Tucson, AZ USA
[5] Ecol & Evolutionary Biol Undergrad Program, Tucson, AZ USA
[6] Univ Arizona, Evelyn McKnight Brain Inst, Tucson, AZ 85724 USA
[7] Univ Arizona, Inst Bio5, Tucson, AZ 85724 USA
关键词
NRF2; alpha-Synuclein; Parkinson's disease; Motor dysfunction; Oxidative stress; Proteotoxic stress; TRANSCRIPTION FACTOR NRF2; MICROGLIAL ACTIVATION; MOUSE MODEL; DISEASE; EXPRESSION; STRESS; MECHANISMS; REDOX; CELLS; NEUROPROTECTION;
D O I
10.14336/AD.2021.0511
中图分类号
R592 [老年病学]; C [社会科学总论];
学科分类号
03 ; 0303 ; 100203 ;
摘要
Nuclear factor (erythroid-derived 2)-like 2 (NRF2) is a central regulator of cellular stress responses and its transcriptional activation promotes multiple cellular defense and survival mechanisms. The loss of NRF2 has been shown to increase oxidative and proteotoxic stress, two key pathological features of neurodegenerative disorders such as Parkinson's disease (PD). Moreover, compromised redox homeostasis and protein quality control can cause the accumulation of pathogenic proteins, including alpha-synuclein (alpha-Syn) which plays a key role in PD. However, despite this link, the precise mechanisms by which NRF2 may regulate PD pathology is not clear. In this study, we generated a humanized mouse model to study the importance of NRF2 in the context of alpha- Syn-driven neuropathology in PD. Specifically, we developed NRF2 knockout and wild-type mice that overexpress human alpha-Syn (h alpha-Syn(+)/Nrf2(-/-) and h alpha-Syn+/Nrf2(+/+) respectively) and tested changes in their behavior through nest building, challenging beam, and open field tests at three months of age. Cellular and molecular alterations in alpha-Syn, including phosphorylation and subsequent oligomerization, as well as changes in oxidative stress, inflammation, and autophagy were also assessed across multiple brain regions. It was observed that although monomeric alpha-Syn levels did not change, compared to their wild-type counterparts, h alpha-Syn(+)/Nrf2(-/-) mice exhibited increased phosphorylation and oligomerization of a-Syn. This was associated with a loss of tyrosine hydroxylase expressing dopaminergic neurons in the substantia nigra, and more pronounced behavioral deficits reminiscent of early-stage PD, in the h alpha-Syn(+)/Nrf2(-/-) mice. Furthermore, h alpha-Syn(+)/Nrf2(-/-) mice showed significantly amplified oxidative stress, greater expression of inflammatory markers, and signs of increased autophagic burden, especially in the midbrain, striatum and cortical brain regions. These results support an important role for NRF2, early in PD progression. More broadly, it indicates NRF2 biology as fundamental to PD pathogenesis and suggests that targeting NRF2 activation may delay the onset and progression of PD.
引用
收藏
页码:964 / 982
页数:19
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