Extracellular Vesicle-Mediated Communication in Ovarian Follicle Development

Ovarian follicle development relies on intricate paracrine and autocrine signalling among the oocyte and its surrounding somatic cells. Extracellular vesicles (EVs) have emerged as critical mediators of this communication network. Secreted by granulosa and cumulus cells into the follicular fluid, EVs encapsulate proteins, lipids and non-coding RNAs that modulate cell proliferation, differentiation and survival. As follicles progress through the antral phase, the concentration and molecular cargo of EVs evolve, reflecting changes in hormonal milieu and cellular states. Vesicle-associated microRNAs fine-tune gene expression in recipient cells, supporting oocyte maturation, cumulus expansion and acquisition of developmental competence. Understanding EV-mediated cross-talk not only illuminates fundamental aspects of folliculogenesis but also holds promise for improving assisted reproductive technologies and non-invasive biomarkers of oocyte quality.

Research from Nature Portfolio

Recent studies have shown that small extracellular vesicles in follicular fluid carry distinct miRNA signatures that correlate closely with pregnancy outcomes following assisted reproductive technology. Analysis of vesicle-associated non-coding RNAs revealed a combination of miRNAs that can predict clinical pregnancy with high accuracy, suggesting potential non-invasive biomarkers for oocyte selection and fertility assessment. Complementary work has profiled EV-miRNA changes across antral follicle maturation, demonstrating that vesicle concentration declines as follicles enlarge and that miRNA cargo shifts from cell proliferation pathways toward those governing inflammatory responses. Additional investigation into the extracellular miRNA landscape of follicular fluid has associated specific vesicle-enclosed miRNAs with fertilisation status and embryo quality in vitro, further highlighting the role of EV-miRNAs in modulating signalling pathways central to oocyte competence and early embryogenesis.

Extracellular Vesicle-Mediated Communication in Ovarian Follicle Development publication trend

The graph below shows the total number of articles in extracellular vesicle-mediated communication in ovarian follicle development across all publications each year (not limited to Nature Index journals).

Technical terms

Extracellular vesicle (EV): Membrane-bound particle secreted by cells that transports proteins, lipids and nucleic acids to recipient cells.

Exosome: Small EVs (30–150 nm) formed within endosomal compartments and released upon fusion with the cell membrane.

MicroRNA (miRNA): Short non-coding RNA molecules that regulate gene expression by binding to complementary messenger RNAs.

Follicular fluid: The liquid milieu surrounding the oocyte and somatic cells within the antral ovarian follicle.

Granulosa cell: Somatic cell in the ovarian follicle that supports oocyte growth through paracrine signalling.

Cumulus-oocyte complex (COC): The oocyte together with its surrounding cumulus cells, essential for nutrient exchange and maturation signals.

Oocyte competence: The ability of an oocyte to complete maturation, undergo successful fertilisation and sustain early embryonic development.

References

1. Small extracellular vesicles in follicular fluids for predicting reproductive outcomes in assisted reproductive technology. Communications Medicine (2024).
2. Characterization and Small RNA Content of Extracellular Vesicles in Follicular Fluid of Developing Bovine Antral Follicles. Scientific Reports (2016).
3. Extracellular microRNAs profile in human follicular fluid and IVF outcomes. Scientific Reports (2018).
4. Porcine Granulosa-Cell-Derived Exosomes Enhance Oocyte Development: An In Vitro Study. Antioxidants (2024).
5. Corpus luteum presence in the bovine ovary increase intrafollicular progesterone concentration: consequences in follicular cells gene expression and follicular fluid small extracellular vesicles miRNA contents. Journal of Ovarian Research (2024).