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Analysis of Differential microRNA Expression in the Hippocampus of Scopolamine-Induced Amnesic Mouse Model
Samita Verma1, Thamil Mani Sivanandam2
1Biochemistry and Molecular Biology Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
Abstract:
Amnesia is characterized by memory deficits linked to various neurodegenerative pathologies and can be induced by the administration of scopolamine, a cholinergic antagonist. Scopolamine-induced amnesia is a well-studied pharmacological animal model that simulates memory impairment caused by aging, brain illnesses, neuropathologies, and trauma. However, the molecular mechanism of amnesia, more importantly in terms of microRNA (miRNA) regulation, is not well understood. Therefore, this study aimed to analyze miRNA profiles in the hippocampus of both control mice and those treated with scopolamine (amnesic mice). Initially, a short cDNA library was prepared for each sample and then sequenced on the Illumina platform. Among the total differentially expressed miRNAs, 113 were significantly upregulated and 96 were downregulated in the scopolamine group in comparison to the control group. Ten upregulated and ten downregulated miRNAs were validated to confirm the reliability of the sequencing results using qRT-PCR (quantitative real-time PCR). Furthermore, we performed a target prediction analysis intersecting the results from TargetScan, miRDB (miRNA database), and Miranda to analyze the targets of the dysregulated miRNAs. We also conducted a pathway analysis to investigate the molecular, cellular, and biological functions of these targets. miRNA‒target interactions were found to play roles in various signaling pathways during amnesia. These results provide an initial insight for the contribution of miRNAs to scopolamine-induced amnesia, as well as their possible application as markers of disease pathology.
Insights
This study reveals significant changes in microRNA (miRNA) profiles in the hippocampus following scopolamine-induced amnesia in mice. These findings offer insights into miRNA roles in memory impairment and potential disease markers.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Amnesia involves memory deficits linked to neurodegenerative diseases.
- Scopolamine-induced amnesia is a model for studying memory impairment.
- The molecular mechanisms, especially microRNA (miRNA) regulation, in amnesia are not fully understood.
Purpose of the Study:
- To analyze miRNA expression profiles in the hippocampus of mice with scopolamine-induced amnesia.
- To identify differentially expressed miRNAs and their potential targets.
- To investigate the role of miRNA-target interactions in amnesia-related signaling pathways.
Main Methods:
- Hippocampal cDNA library preparation and Illumina sequencing.
- Differential expression analysis of miRNAs.
- Quantitative real-time PCR (qRT-PCR) for miRNA validation.
- Target prediction using TargetScan, miRDB, and Miranda.
- Pathway analysis of miRNA targets.
Main Results:
- Significant upregulation of 113 miRNAs and downregulation of 96 miRNAs in scopolamine-treated mice compared to controls.
- Validation of 10 upregulated and 10 downregulated miRNAs via qRT-PCR.
- Identification of miRNA-target interactions involved in various signaling pathways relevant to amnesia.
Conclusions:
- MicroRNAs play a significant role in the molecular mechanisms of scopolamine-induced amnesia.
- Dysregulated miRNAs and their targets are implicated in amnesia pathology.
- Identified miRNAs may serve as potential biomarkers for amnesia.
