Extracellular Vesicle-Derived microRNA Crosstalk Between Equine Chondrocytes and Synoviocytes-An In Vitro Approach

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Extracellular vesicles (EVs) mediate cell-to-cell communication.
• MicroRNAs (miRNAs) within EVs play crucial roles in regulating cellular functions.
• Understanding EV-miRNA crosstalk in equine joint cells is vital for equine health.

Purpose of the Study:

• To develop and validate a novel technique for analyzing EV-derived miRNA exchange between equine chondrocytes and synoviocytes.
• To identify specific miRNAs involved in intercellular communication within the equine joint.
• To explore the functional implications of EV-miRNA crosstalk on equine chondrocyte and synoviocyte behavior.

Main Methods:

• Equine chondrocytes and synoviocytes were labeled with 5-ethynyl uridine (5-EU).
• EVs were isolated from cell culture media and co-cultured with recipient cells.
• RNA was extracted from recipient cells, and 5-EU-labeled RNA was sequenced.
• Differential expression analysis and pathway analysis were performed on identified miRNAs.

Main Results:

• A total of 198 and 213 miRNAs were identified in recipient synoviocytes and chondrocytes, respectively.
• The top five most abundant miRNAs (eca-miR-21, eca-miR-221, eca-miR-222, eca-miR-100, eca-miR-26a) were common to both cell types and linked to joint homeostasis.
• Nine differentially expressed miRNAs were identified between chondrocytes and synoviocytes, associated with cell migration, apoptosis, viability, and inflammation.

Conclusions:

• The developed technique effectively characterizes EV-derived miRNA crosstalk between equine chondrocytes and synoviocytes.
• Identified EV-communicated miRNAs are potentially involved in regulating equine joint cell viability, inflammation, and homeostasis.
• This study provides a foundation for further research into EV-mediated communication in equine joint diseases.