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Profiling microRNA from Brain by Microarray in a Transgenic Mouse Model of Alzheimer's Disease
Lin-Lin Wang1, Li Min2, Qing-Dong Guo2
1Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
Abstract:
MicroRNAs (miRNAs) are small noncoding RNAs, which regulate numerous cell functions by targeting mRNA for cleavage or translational repression, and have been found to play an important role in Alzheimer's disease (AD). Our study aimed to identify differentially expressed miRNAs in AD brain as a reference of potential therapeutic miRNAs or biomarkers for this disease. We used amyloid precursor protein (APP) and presenilin 1 (PS1) double transgenic mice and age-matched wild-type (WT) littermates to determine the expression of miRNAs in the brain. MiRNAs were profiled by microarray, and differentially expressed miRNAs underwent target prediction and enrichment analysis. Microarray analysis revealed 56 differentially expressed miRNAs in AD mouse brain, which involved 39 miRNAs that were significantly upregulated and 19 that were downregulated at different ages. Among those miRNAs, a total of 11 miRNAs, including miR-342-3p, miR-342-5p, miR-376c-3p, and miR-301b-3p, were not only conserved in human but also predicted to have targets and signaling pathways closely related to the pathology of AD. In conclusion, in this study, differentially expressed miRNAs were identified in AD brain and proposed as biomarkers, which may have the potential to indicate AD progression. Despite being preliminary, these results may aid in investigating pathological hallmarks and identify effective therapeutic targets.
Insights
Researchers identified 56 differentially expressed microRNAs (miRNAs) in Alzheimer's disease (AD) mouse brains, with 11 conserved in humans. These AD biomarkers may help track disease progression and identify therapeutic targets.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are small noncoding RNAs regulating gene expression.
- miRNAs play a crucial role in cellular functions and are implicated in Alzheimer's disease (AD) pathogenesis.
- Identifying specific miRNAs in AD brains is essential for understanding disease mechanisms and developing therapies.
Purpose of the Study:
- To identify differentially expressed miRNAs in the brain of Alzheimer's disease (AD) mouse models.
- To evaluate the potential of these miRNAs as therapeutic targets or diagnostic biomarkers for AD.
- To analyze the conservation and predicted targets of identified miRNAs in relation to AD pathology.
Main Methods:
- Utilized amyloid precursor protein (APP) and presenilin 1 (PS1) double transgenic mice and age-matched wild-type (WT) littermates.
- Employed microarray analysis to profile miRNA expression in AD mouse brains.
- Performed target prediction and enrichment analysis on differentially expressed miRNAs.
Main Results:
- Identified 56 differentially expressed miRNAs in AD mouse brains, including 39 upregulated and 19 downregulated.
- Found 11 miRNAs, such as miR-342-3p and miR-376c-3p, conserved in humans and linked to AD-related pathways.
- These conserved miRNAs showed predicted targets and signaling pathways relevant to AD pathology.
Conclusions:
- Differential expression of miRNAs in the AD brain was confirmed.
- Identified miRNAs serve as potential biomarkers for indicating AD progression.
- Preliminary findings suggest these miRNAs could aid in investigating AD hallmarks and identifying therapeutic strategies.
