Abstract
Background Certain conditions can stimulate stem cells to produce secretory factors that differ from each condition, such as hypoxia. Umbilical Cord-derived Mesenchymal Stem Cells have been known to have higher proliferation rates, plasticity, and better self-improvement ability than MSCs from other sources. The objective was to analyze the secreting proteins in the Conditioned Medium - Umbilical cord-derived Mesenchymal Stem Cells (CM-UCMSCs) which potentially has a role in the chondrogenesis of cartilage defect. Methods We used SDS PAGE combined with electrospray ionization mass spectrometry using mass spectrometer to perform a proteomic analysis of CM-UCMSCs which conditioned in a state of fasting (without serum albumin). Then, we continue to analyze to identify proteins of interest using Mascot sequence matching software. Then Analyzed using in silico / molecular docking to know the interaction of each protein with the cartilage repair factor. Results SDS PAGE performed on all secreted products in CM-UCMSCs. We found one dominant band, then we used Mass Spectrometry continued Mascot sequencing protein that band, conclude that the protein was a D4A9T1/ RNF-111/ Arkadia Protein. And then using in silico/ molecular docking method analyzed that Arkadia Protein worked synergistically with TGF-β1 Protein through activation of TGF-β1 receptors to induce the chondrogenesis. Conclusions Our results show that the fasting state on CM-UCMSCs promoted secreted Arkadia protein. From in silico model prediction, this protein suspects to have an important role in the process of repairing cartilage defects. However, further research is needed before feasible and safe for the clinical application of CM-UCMSCs in cartilage repair.