Different Culture Times Affect MicroRNA Cargo in Equine Amniotic Mesenchymal Cells and Their Microvesicles.

The research investigates how different culture times affect the microRNA (miRNA) contents of equine amniotic mesenchymal cells (AMCs) and their microvesicles (MVs). It discovered that culture duration can change the miRNA profile, a fact that may impact studies in regenerative medicine.

Study Objectives and Procedures

• This research aimed to determine if the period of culturing impacts the miRNAs cargo in AMCs and their MVs. The possible changes in the microRNAs content may affect studies that compare the effectiveness of CM, a product of a 12-96-hour cell culture, and MVs that are collected after overnight cell culture in the field of regenerative medicine.
• Essentially, AMCs are cultured for different periods then the miRNA composition of both the cells and their MVs is analysed. The researchers identified 990 miRNAs in their analysis.
• The study used Equus caballus (horse) AMCs as the subject. Microvesicles (MVs) are small cell-derived particles that are released into the extracellular environment. microRNAs (miRNAs) are small non-coding RNA molecules that play key roles in regulating gene expression.

Results and Findings

• After one night of cell culture, the study identified 347 differently expressed miRNAs between MVs and cells. On the other hand, they found 359 DE-miRNAs after four nights of culture.
• About 58.3% of the differently expressed miRNAs were common in samples produced under both one-night and four-night culture conditions.
• When comparing miRNA content in AMC cells cultured for one night versus four nights, eight differently expressed Equus caballus miRNAs were identified which targeted genes involved in immune response to external stimuli, inflammatory response, and the production of molecules called reactive oxygen species.
• Notably, in MVs isolated from either one or four nights, four differently expressed miRNAs were found that targeted genes regulating cell cycle progression and production of reactive oxygen species. Specifically, eca-miR-214 was found to be abundant in the MVs after four nights.

Conclusion and Implication

• After four days of cell culture, there were noticeable alterations in the profile of AMC miRNAs. These changes could represent a phenotypic transition in response to a new cell culture environment and aging of the cells.
• The study concluded that MVs accumulated more of eca-miR-214 after four days of culturing. This miRNA might be helping cells survive or adapt to the new culture conditions. Lessons from this research could improve cell culturing techniques, and it indicates another factor that could influence studies in regenerative medicine.