دورية أكاديمية
Imaging asparaginyl endopeptidase (AEP) in the live brain as a biomarker for Alzheimer’s disease
| العنوان: | Imaging asparaginyl endopeptidase (AEP) in the live brain as a biomarker for Alzheimer’s disease |
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| المؤلفون: | Shan-Shan Wang, Zi-Kai Liu, Jing-Jing Liu, Qing Cheng, Yan-Xia Wang, Yan Liu, Wen-Wen Ni, Hong-Zhuan Chen, Mingke Song |
| المصدر: | Journal of Nanobiotechnology, Vol 19, Iss 1, Pp 1-18 (2021) |
| بيانات النشر: | BMC, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Biotechnology LCC:Medical technology |
| مصطلحات موضوعية: | Alzheimer’s disease, Early diagnosis, Biomarker, Asparagine endopeptidase, Legumain, Live brain imaging, Biotechnology, TP248.13-248.65, Medical technology, R855-855.5 |
| الوصف: | Abstract Background Discovery of early-stage biomarkers is a long-sought goal of Alzheimer’s disease (AD) diagnosis. Age is the greatest risk factor for most AD and accumulating evidence suggests that age-dependent elevation of asparaginyl endopeptidase (AEP) in the brain may represent a new biological marker for predicting AD. However, this speculation remains to be explored with an appropriate assay method because mammalian AEP exists in many organs and the level of AEP in body fluid isn’t proportional to its concentration in brain parenchyma. To this end, we here modified gold nanoparticle (AuNPs) into an AEP-responsive imaging probe and choose transgenic APPswe/PS1dE9 (APP/PS1) mice as an animal model of AD. Our aim is to determine whether imaging of brain AEP can be used to predict AD pathology. Results This AEP-responsive imaging probe AuNPs-Cy5.5-A&C consisted of two particles, AuNPs-Cy5.5-AK and AuNPs-Cy5.5-CABT, which were respectively modified with Ala–Ala–Asn–Cys–Lys (AK) and 2-cyano-6-aminobenzothiazole (CABT). We showed that AuNPs-Cy5.5-A&C could be selectively activated by AEP to aggregate and emit strong fluorescence. Moreover, AuNPs-Cy5.5-A&C displayed a general applicability in various cell lines and its florescence intensity correlated well with AEP activity in these cells. In the brain of APP/PS1 transgenic mice , AEP activity was increased at an early disease stage of AD that precedes formation of senile plaques and cognitive impairment. Pharmacological inhibition of AEP with δ-secretase inhibitor 11 (10 mg kg−1, p.o.) reduced production of β-amyloid (Aβ) and ameliorated memory loss. Therefore, elevation of AEP is an early sign of AD onset. Finally, we showed that live animal imaging with this AEP-responsive probe could monitor the up-regulated AEP in the brain of APP/PS1 mice. Conclusions The current work provided a proof of concept that assessment of brain AEP activity by in vivo imaging assay is a potential biomarker for early diagnosis of AD. Graphical abstract |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1477-3155 |
| Relation: | https://doaj.org/toc/1477-3155 |
| DOI: | 10.1186/s12951-021-00988-0 |
| URL الوصول: | https://doaj.org/article/e3426329a5794106b0addde25315d1e3 |
| رقم الأكسشن: | edsdoj.3426329a5794106b0addde25315d1e3 |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 14773155 |
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| DOI: | 10.1186/s12951-021-00988-0 |