MicroRNA-193b is a regulator of amyloid precursor protein in the blood and cerebrospinal fluid derived exosomal microRNA-193b is a biomarker of Alzheimer's disease

  • Authors:
    • Chen-Geng Liu
    • Jing Song
    • Yue-Qi Zhang
    • Pei-Chang Wang
  • View Affiliations

  • Published online on: August 12, 2014     https://doi.org/10.3892/mmr.2014.2484
  • Pages: 2395-2400
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Abstract

Amyloid precursor protein (APP) has an important function in the generation of Alzheimer's disease (AD). In our previous study, miR‑193b was found to be downregulated in the hippocampi of 9‑month‑old APP/PS1 double‑transgenic mice using microRNA (miR) array. In the present study, bioinformatic analyses showed that miR‑193b was a miR that was predicted to potentially target the 3'‑untranslated region (UTR) of APP. Subsequently, the function of miR‑193b on APP was studied. The levels of miR‑193b, exosomal miR‑193b, Aβ, tau, p‑tau, HCY and APOE in samples from APP/PS1 double‑transgenic mice, mild cognitive impairment (MCI) and dementia of Alzheimer‑type (DAT) patients, were measured. The results indicated that overexpression of miR‑193b could repress the mRNA and protein expression of APP. The miR‑193b inhibitor oligonucleotide induced upregulation of APP. Binding sites of miR‑193b in the 3'‑UTR of APP were identified by luciferase assay. MCI and DAT patients had lower exosomal miR‑193b, but not total miR‑193b, in the blood as compared with the controls. DAT patients had lower exosomal miR‑193b levels in blood as compared with the MCI group. A decreased exosomal miR‑193b expression level was additionally observed in the cerebral spinal fluid (CSF) of DAT patients. Negative correlations were found between exosomal miR‑193b and Aβ42 in the CSF of DAT patients. In conclusion, these findings showed that miR‑193b may function in the development of AD and exosomal miR‑193b has potential as a novel, non-invasive, blood‑based biomarker of MCI and DAT patients.

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November 2014
Volume 10 Issue 5

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APA
Liu, C., Song, J., Zhang, Y., & Wang, P. (2014). MicroRNA-193b is a regulator of amyloid precursor protein in the blood and cerebrospinal fluid derived exosomal microRNA-193b is a biomarker of Alzheimer's disease. Molecular Medicine Reports, 10, 2395-2400. https://doi.org/10.3892/mmr.2014.2484
MLA
Liu, C., Song, J., Zhang, Y., Wang, P."MicroRNA-193b is a regulator of amyloid precursor protein in the blood and cerebrospinal fluid derived exosomal microRNA-193b is a biomarker of Alzheimer's disease". Molecular Medicine Reports 10.5 (2014): 2395-2400.
Chicago
Liu, C., Song, J., Zhang, Y., Wang, P."MicroRNA-193b is a regulator of amyloid precursor protein in the blood and cerebrospinal fluid derived exosomal microRNA-193b is a biomarker of Alzheimer's disease". Molecular Medicine Reports 10, no. 5 (2014): 2395-2400. https://doi.org/10.3892/mmr.2014.2484