Abstract
Neuroinflammation plays an early and prominent role in the pathology of Alzheimer’s disease (AD). Tumor necrosis factor-α-induced protein 8-like 2 (TIPE2) has been identified as a negative regulator of innate and adaptive immunity. However, whether TIPE2 affects cognitive functions in AD-like mouse models remains unknown. In this study, we compared the gene and protein expressions of TIPE2 between the APP/PS1 mice and the age-matched wild type (WT) mice at different stages of development using western blot and RT-qPCR. The hippocampal expression of the TIPE2 mRNA and protein in APP/PS1 mice was higher than that of the WT mice starting from 6 months to 10 months. However, the difference of the TIPE2 expression between the APP/PS1 mice and the WT mice declined in a time-dependent manner. The spatial learning and memory deficit from the 8-month-old APP/PS1 mice was observed in the Y-maze test and fear conditioning task. Interestingly, overexpression of TIPE2 by intra-hippocampal injection of AAV-TIPE2 into APP/PS1 mice resulted in an improvement of learning and memory and reduced expression of inflammatory cytokines, such as TNF-α, IL-6 and IL-1β, and increased expression of anti-inflammatory cytokines, such as IL-10 and Arg-1. Taken together, our findings show that the TIPE2 expression level was negatively correlated with the pathogenesis of Alzheimer’s disease, and overexpression of TIPE2 attenuates cognitive deficits in APP/PS1 mice, suggesting TIPE2 is a potential target for pharmacological intervention and improvement of cognitive deficits.
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Data Availability
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AD:
-
Alzheimer’s disease
- TIPE2:
-
Tumor necrosis factor-α-induced protein 8-like 2
- Aβ:
-
β-amyloid
- Iba1:
-
ionized calcium binding adaptor molecule 1
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Acknowledgements
This work was supported by the research fundings granted to Fang ZHANG from the Natural Science Foundation of Shandong Province of China, No. ZR2016 HM 46; Post doctoral application foundation of Qingdao Municipal Bureau of Social Sciences, No. 2016062; Qingdao Science and Technology Bureau, No. 18-6-1-75-nsh; Clinical medicine +X Project of Qingdao University Medical Department, No. 2017 M08; and Innovation and Entrepreneurship Training Program of undergraduate student in Qingdao University, No. 201711065152.
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Fang Zhang, Wenjian Shao, Zhihong Yang, Lei Wang and Chuanxia Ju contributed to the experimental design. Yongzhen Miao, Zihan Xu and Ruoyu Zhang contributed to the experimental process. Yongzhen Miao wrote this article. Naidong Wang provided fund support for our supplementary experiment and revised our manuscript.
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Miao, Y., Wang, N., Shao, W. et al. Overexpression of TIPE2, a Negative Regulator of Innate and Adaptive Immunity, Attenuates Cognitive Deficits in APP/PS1 Mice. J Neuroimmune Pharmacol 14, 519–529 (2019). https://doi.org/10.1007/s11481-019-09861-2
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DOI: https://doi.org/10.1007/s11481-019-09861-2