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Distribution of microRNAs associated with major depressive disorder among blood compartments
Claudia Homorogan1, Virgil Radu Enatescu1,2, Diana Nitusca3
1Discipline of Psychiatry, Department of Neurosciences, "Victor Babes" University of Medicine and Pharmacy Timisoara, Timisoara, Romania.
Objective:
Major depressive disorder (MDD) is a recurrent disorder with an increasing incidence. Alterations in key signaling pathways of the nervous system, such as the Wnt and MAPK pathways, mediated through microRNAs (miRNAs) provide crucial information regarding the etiopathology of MDD. We aimed to analyze whether the heterogeneity of literature findings regarding differential expression of miRNAs in the blood could arise from their different distributions among blood compartments.
Methods:
We performed a pilot study analyzing the differential expression of miR-26a, miR-494, miR-30c, miR-93, and miR-101 and investigated their levels in white blood cells, total plasma (TP), exosomes from plasma, and exosome depleted plasma (EDP) in patients with MDD before and after antidepressant treatment with escitalopram and in healthy controls.
Results:
MiR-494 was more abundant in EDP, and miR-26a and miR-30c were predominantly more abundant in TP relative to other blood compartments. Moreover, miR-30c, miR-101, and miR-26a, were significantly downregulated in TP of patients with MDD compared with controls. After antidepressant treatment, only miR-494 was significantly differently expressed in EDP.
Conclusions:
This proof-of-principle study suggests that identifying the miRNA abundance in different blood compartments is crucial for biomarker development and could enrich the current knowledge regarding MDD pathophysiology.
Insights
Investigating microRNA (miRNA) levels in different blood compartments revealed distinct distributions. This finding is crucial for understanding major depressive disorder (MDD) pathophysiology and developing diagnostic biomarkers.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Major depressive disorder (MDD) is a recurrent condition with increasing incidence.
- MicroRNAs (miRNAs) are implicated in MDD pathogenesis through Wnt and MAPK signaling pathways.
- Literature findings on differential miRNA expression in MDD are heterogeneous, potentially due to blood compartment variations.
Purpose of the Study:
- To investigate if differing miRNA distributions across blood compartments contribute to heterogeneity in MDD research findings.
- To analyze the expression levels of specific miRNAs (miR-26a, miR-494, miR-30c, miR-93, miR-101) in various blood fractions.
Main Methods:
- Pilot study analyzing differential expression of five miRNAs in white blood cells, total plasma (TP), plasma exosomes, and exosome-depleted plasma (EDP).
- Comparison between patients with MDD and healthy controls, both before and after antidepressant treatment (escitalopram).
Main Results:
- MiR-494 was more abundant in EDP; miR-26a and miR-30c were more abundant in TP.
- miR-30c, miR-101, and miR-26a were significantly downregulated in the TP of MDD patients compared to controls.
- Following antidepressant treatment, only miR-494 showed significant differential expression in EDP.
Conclusions:
- Identifying miRNA abundance in distinct blood compartments is essential for accurate biomarker development in MDD.
- This study enhances understanding of MDD pathophysiology by considering miRNA localization within blood components.
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