Induction of in vivo-like ciliation in confluent monolayers of re-differentiated equine oviduct epithelial cells.

The research team experimented with monocellular layers of regenerated equine oviduct epithelial cells (REOECs), focusing on the impact of various factors on the cell morphology and achieving in vivo-like secondary ciliation. The experiment utilized multiple substances, cell density, and cell cultivation formats. The researchers observed that the combination of oviduct explant cell concentration and notch inhibition was crucial in achieving in vivo-like ciliation patterns.

Experimentation on REOEC Monolayers

The experimentation process involved the following aspects:

• Multiple substances, including the fetal bovine serum, reproductive steroid hormones, and Wnt- and Notch ligands and inhibitors, were tested.
• Various cell densities were used in the seeding of equine oviduct epithelial cells (EOECs).
• Both conventional wells and microporous membranes were used for cell cultivation.
• Observation of the morphology and secondary ciliation of EOECs was assessed using confocal microscopy. This method involved combined staining of cell nuclei, cilia, and cytoskeleton.

Observations and Findings

The researchers found that:

• Only Wnt ligands, Notch inhibitors, and oviduct explant cell concentration had an effect on the EOEC’s morphology.
• Exposure of REOEC monolayers to Wnt3a containing medium and Wnt ligand CHIR 99021 resulted in an undesirable epithelial-mesenchymal transition, a shift in the state of cells from epithelial to mesenchymal.
• When it came to secondary ciliation, the combination of oviduct explant cell concentration and Notch inhibition directed the REOEC monolayers towards in vivo-like ciliation patterns.
• De-differentiated EOECs were able to reestablish REOEC monolayers with high ciliation rates when placed in specific conditions.

Conclusion

The research concluded that:

• Monolayers of regenerated equine oviduct epithelial cells have significantly similar characteristics to in vivo oviduct epithelial cells.
• Secondary ciliation can be supported by adjusting seeding densities and using inhibitors.
• Notch inhibition was successful in increasing secondary ciliation rates, a significant step towards achieving viable in vivo-like ciliation patterns.