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Plasma-Derived Small Extracellular Vesicles miR- 182 - 5p Is a Potential Biomarker for Diagnosing Major Depressive
Lin-Lin Zhu1, Lian-Di Li2, Xuan-Yu Lin1
1Department of Clinical Pharmacology, School of Pharmacy, Nanjing Medical University, 101 Longmian Avenue, Jiangning District, Nanjing, 211166, Jiangsu Province, China.
Abstract:
Depression, particularly major depressive disorder (MDD), is a debilitating neuropsychiatric condition characterized by high disability rates, primarily driven by chronic stress and genetic predispositions. Emerging evidence highlights the critical role of microRNAs (miRNAs) in the pathogenesis of depression, with plasma-derived small extracellular vesicles (sEVs) emerging as promising biomarkers. In this study, we collected peripheral blood plasma samples from patients diagnosed with MDD, as assessed by the Hamilton Depression Rating scale, alongside healthy individuals serving as controls. Plasma-derived sEVs were isolated via ultracentrifugation, followed by high-throughput sequencing of miRNAs encapsulated within sEVs, and finally image acquisition and differential expression analysis. Our results revealed a significant elevation of miR-182-5p in plasma-derived sEVs from MDD patients compared to healthy controls, a finding further validated in chronic mild stress (CMS) models. Further analysis suggested that miRNAs encapsulated within sEVs may influence depression onset and progression by modulating hypothalamic-pituitary-adrenal (HPA) axis activity. These findings underscore the potential of miRNAs and their target genes as novel biomarkers, offering improved diagnostic accuracy and therapeutic efficacy for MDD.
Insights
Major depressive disorder (MDD) is linked to elevated miR-182-5p in plasma extracellular vesicles. This discovery offers potential new biomarkers for diagnosing and treating depression.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Major Depressive Disorder (MDD) is a leading cause of disability, often linked to chronic stress and genetics.
- MicroRNAs (miRNAs) are increasingly recognized for their role in depression's development.
- Plasma-derived small extracellular vesicles (sEVs) show promise as diagnostic biomarkers for MDD.
Purpose of the Study:
- To investigate the role of miRNAs within plasma-derived sEVs as potential biomarkers for MDD.
- To identify specific miRNA alterations associated with MDD.
- To explore the functional implications of these miRNAs in depression pathogenesis.
Main Methods:
- Collected peripheral blood plasma from MDD patients and healthy controls.
- Isolated plasma-derived sEVs using ultracentrifugation.
- Performed high-throughput miRNA sequencing and differential expression analysis.
Main Results:
- Identified a significant increase in miR-182-5p levels within plasma-derived sEVs of MDD patients compared to controls.
- Validated the elevated miR-182-5p finding in a chronic mild stress (CMS) mouse model.
- Suggests sEV-encapsulated miRNAs may influence depression via modulation of the hypothalamic-pituitary-adrenal (HPA) axis.
Conclusions:
- Plasma-derived sEVs harbor specific miRNA profiles that can serve as biomarkers for MDD.
- miR-182-5p is a potential diagnostic and therapeutic target for major depressive disorder.
- Further research into miRNA-HPA axis interactions could reveal novel treatment strategies for depression.
