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Oral Contraceptive Use Is Associated with Significant Differences in MicroRNA Cargo of L1CAM-Associated Extracellular
Dana M Lapato1,2, Rebekah Frye3, Vasily Yakovlev4
1Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, VA, USA.
Medrxiv : the Preprint Server for Health Sciences
|January 27, 2025
Summary
Oral contraceptive (OC) use in young women alters microRNA levels in extracellular vesicles, potentially impacting brain development. These findings suggest OCs may influence reproductive pathways and brain activity.
Area of Science:
- Neuroendocrinology
- Molecular Biology
- Reproductive Health
Background:
- Oral contraceptives (OCs) are widely used by adolescents and young women, a period of significant brain maturation.
- The neurobiological effects of OCs during this critical developmental window are not fully understood.
- Extracellular vesicles (EVs) and their microRNA (miRNA) cargo are increasingly recognized as potential biomarkers of biological activity, including in the brain.
Purpose of the Study:
- To investigate whether oral contraceptive use is associated with differential expression of microRNAs in circulating extracellular vesicles.
- To explore the potential impact of OC-associated miRNA changes on brain-related biological pathways.
- To assess the utility of EV-derived miRNAs as indicators of OC's influence on neurobiology.
Main Methods:
- Serum samples were collected from young women categorized by oral contraceptive use (never vs. current).
- MicroRNA cargo within L1CAM-associated extracellular vesicles was isolated and quantified using a targeted PCR panel.
- Statistical analyses (linear regression, F-tests) identified differentially expressed miRNAs, followed by pathway analysis (PANTHER) of their gene targets.
Main Results:
- Twelve microRNAs exhibited significant differential expression variability between current and never OC users (Bonferroni adjusted p < 0.002).
- Pathway analysis of the 1254 targeted genes revealed significant enrichment for the Gonadotropin-releasing hormone receptor pathway (FDR q = 5 × 10-7).
- This pathway is crucial for regulating gonadotropin release, pubertal development, and reproductive functions.
Conclusions:
- MicroRNA profiles in circulating extracellular vesicles may serve as a proxy for brain-related biological activity.
- Oral contraceptive use is associated with altered extracellular vesicle microRNA composition in young women.
- These findings suggest a potential mechanism by which OCs may influence neurobiological pathways, particularly those related to reproduction.
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