Cited by 74Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

USP25 inhibition ameliorates Alzheimer’s pathology through the regulation of APP processing and Aβ generation

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Zheng, Qiuyang, Song, Beibei, Li, Guilin, Cai, Fang, Wu, Meiling, Zhao, Yingjun, Jiang, LuLin, Guo, Tiantian +22 more·2022·Journal of Clinical Investigation

Abstract

Down syndrome (DS), or trisomy 21, is one of the critical risk factors for early-onset Alzheimer's disease (AD), implicating key roles for chromosome 21-encoded genes in the pathogenesis of AD. We previously identified a role for the deubiquitinase USP25, encoded on chromosome 21, in regulating microglial homeostasis in the AD brain; however, whether USP25 affects amyloid pathology remains unknown. Here, by crossing 5×FAD AD and Dp16 DS mice, we observed that trisomy 21 exacerbated amyloid pathology in the 5×FAD brain. Moreover, bacterial artificial chromosome (BAC) transgene-mediated USP25 overexpression increased amyloid deposition in the 5×FAD mouse brain, whereas genetic deletion of Usp25 reduced amyloid deposition. Furthermore, our results demonstrate that USP25 promoted β cleavage of APP and Aβ generation by reducing the ubiquitination and lysosomal degradation of both APP and BACE1. Importantly, pharmacological inhibition of USP25 ameliorated amyloid pathology in the 5×FAD mouse brain. In summary, we identified the DS-related gene USP25 as a critical regulator of AD pathology, and our data suggest that USP25 serves as a potential pharmacological target for AD drug development.

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  • USP25, a ubiquitin-specific protease encoded on HSA21, is a critical regulator of AD pathology, promoting β cleavage of APP and Aβ generation by reducing ubiquitination and lysosomal degradation of APP and BACE1 in DS-AD mice.

    “Furthermore, it was recently reported that USP25, a ubiquitin-specific protease encoded on HSA21, is a critical regulator of AD pathology, as it promotes β cleavage of APP and Aβ generation by reducing the ubiquitination and lysosomal degradation of both APP and BACE1 in DS-AD mice.19,20”

    From Interferon signaling modulates Down syndrome-associated Alzheimer’s disease pathology in a mouse model (2025) · cites this paper as [19]

    The Introduction identifies USP25 as chromosome 21–encoded, and the Results section on BACE1 deubiquitination and APP β cleavage shows that USP25 reduces APP and BACE1 ubiquitination and protects them from degradation. The Results on increased USP25 gene dosage also report greater amyloid pathology in a combined DS-AD mouse model. However, the cited mechanistic experiments were not shown in those DS-AD mice, so the claim’s final qualifier overstates where that mechanism was demonstrated. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Previous studies in mouse models of DS-AD have shown that independently of an extra copy of APP, other genes on HSA21 can increase Aβ plaque deposition at 5 and 6 months of age, indicating that genes act early in the pathological cascade.

    “previous studies in mouse models of DS-AD have shown that independently of an extra copy of APP, other genes on HSA21 can increase Aβ plaque deposition at 5 and 6 months of age, indicating that genes act early in the pathological cascade.”

    From Interferon signaling modulates Down syndrome-associated Alzheimer’s disease pathology in a mouse model (2025) · cites this paper as [19]

    The Results (page not provided) report increased Aβ plaques in 5-month-old 5×FAD;Dp16 mice and in 6-month-old mice overexpressing the chromosome 21 gene USP25. But the 5-month-old Dp16 mice also had increased APP, so that experiment does not establish an APP-copy-independent effect at 5 months. The Discussion reports a previous APP-copy-independent finding in another DS-AD mouse model, without specifying its age. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • An additional copy of HSA21 genes can alter APP biology, including Aβ deposition, in other APP transgenic models.

    “Previous studies have indicated that an additional copy of HSA21 genes can alter APP biology, including Aβ deposition in other APP transgenic models.”

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Authors
Zheng, Q., Song, B., Li, G., Cai, F., Wu, M., Zhao, Y., Jiang, L., Guo, T., Shen, M., Hou, H., Zhou, Y., Zhao, Y., Di, A., Zhang, L., Zeng, F., Zhang, X.-F., Luo, H., Zhang, X., Zhang, H., Zeng, Z., Huang, T. Y., Dong, C., Qing, H., Zhang, Y., Zhang, Q., Wang, X., Wu, Y., Xu, H., Song, W., & Wang, X.
Affiliations
  • Xiamen University (CN)
  • University of British Columbia (CA)
  • Sanford Burnham Prebys Medical Discovery Institute (US)
  • Tsinghua University (CN)
  • Beijing Institute of Technology (CN)
  • Wenzhou Medical University (CN)
Corresponding author
Song, Weihong
Venue
Journal of Clinical Investigation
Published
2022-03-01
Volume
132
Issue
5
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W4214883623
Cited by
73
References
42
Citations by year
2026: 18 · 2025: 20 · 2024: 15 · 2023: 16 · 2022: 4
FWCI
8.51
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
CIHR (PJT-166127)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
USP25, Alzheimer's disease, Down syndrome, amyloid-beta, APP processing, BACE1, ubiquitination, lysosomal degradation, microglia, 5xFAD mice, deubiquitinase, therapeutic target
MeSH terms
Alzheimer Disease, Amyloidosis, Animals, Brain, Disease Models, Animal, Down Syndrome, Flavin-Adenine Dinucleotide, Mice, Transgenic, Amyloid beta-Peptides, Aspartic Acid Endopeptidases, Amyloid beta-Protein Precursor, Ubiquitin Thiolesterase, Mice, Amyloid Precursor Protein Secretases

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