Sperm-Oviduct Interactions in Mammalian Fertility

The oviduct constitutes a dynamic microenvironment where spermatozoa undergo critical functional transformations before encountering the oocyte. Upon entering the isthmic region, sperm bind to epithelial cells to form a transient reservoir that prolongs viability and regulates capacitation. Fluid secretions, glycans and extracellular vesicles modulate membrane remodelling, motility and ion fluxes, ensuring that only optimally prepared sperm reach the ampulla. At the time of ovulation, hormonal cues and local ligand–receptor interactions trigger sperm release, enabling hyperactivated motility and guided passage towards the oocyte. This finely tuned dialogue between sperm and oviduct underpins fertilisation success, influences species-specific selection mechanisms and offers targets for fertility treatments and novel contraceptives.

Research from Nature Portfolio

Investigations have elucidated the role of oviductal fluid macromolecules in governing sperm adherence. Studies using in vitro epithelial spheroid models reveal that glycosaminoglycans such as heparan sulphate markedly decrease sperm binding without impairing motility or membrane integrity, indicating a regulatory mechanism for reservoir formation and release. Complementary work in felids demonstrates that extracellular vesicles interact directly with the sperm head and mid-piece, transferring proteins involved in energy metabolism and membrane stabilisation. Incubation with these vesicles enhances sperm motility, prevents premature acrosomal exocytosis and boosts fertilising capacity, illustrating a conserved role for vesicle-mediated signalling in mammalian fertility.

Sperm-Oviduct Interactions in Mammalian Fertility publication trend

The graph below shows the total number of articles in sperm-oviduct interactions in mammalian fertility across all publications each year (not limited to Nature Index journals).

Technical terms

Capacitation: Biochemical and physiological changes that sperm undergo in the female tract to acquire fertilising competence.

Sperm reservoir: A transient binding of sperm to oviductal epithelium in the isthmus that delays capacitation and extends lifespan.

Extracellular vesicles (EVs): Membrane-bound particles released by oviductal cells that deliver proteins and signalling molecules to sperm.

Glycosaminoglycans: Linear polysaccharides in oviductal fluid that modulate sperm–epithelium adhesion and release.

CatSper channel: A sperm-specific calcium channel that mediates Ca2+ influx associated with hyperactivated motility and release from the reservoir.

References

1. The sperm-interacting proteome in the bovine isthmus and ampulla during the periovulatory period. Journal of Animal Science and Biotechnology (2023).
2. The Mature COC Promotes the Ampullary NPPC Required for Sperm Release from Porcine Oviduct Cells. International Journal of Molecular Sciences (2023).
3. Evaluation of women’s aging influence on sperm passage inside the fallopian tube using 3D dynamic mechanical modeling. Frontiers in Bioengineering and Biotechnology (2024).
4. Sperm-fluid-cell interplays in the bovine oviduct: glycosaminoglycans modulate sperm binding to the isthmic reservoir. Scientific Reports (2023).
5. Oviductal extracellular vesicles interact with the spermatozoon’s head and mid-piece and improves its motility and fertilizing ability in the domestic cat. Scientific Reports (2019).