Proteomic Comparison of Conditioned Media from Mesenchymal Stem Cells of Different Human Tissues: Implications for Therapy.

OBJECTIVE

Mesenchymal stem cells (MSCs) suppress inflammation and promote tissue repair via paracrine factors. MSC-conditioned medium (MSC-CM), rich in these factors, shows promise as a cell-free therapy. This study explored the protein profiles of MSC-CMs from different human tissues (dental pulp, adipose tissue, umbilical cord, and placenta) to assess variations and therapeutic potential.

METHODS

MSCs were cultured from dental pulp, adipose tissue, umbilical cord, and placenta, and MSC-CMs were collected. Proteomic analysis using LC-MS/MS identified and quantified proteins, followed by bioinformatic analysis.

RESULTS

A total of 924 secreted proteins were identified in MSC-CMs from the four tissue sources. Extracellular matrix (ECM) signatures were prominent across all MSC-CMs. MSC-CM from adipose tissue had the highest levels of skin care-related proteins. Neuronal growth-related proteins were most abundant in umbilical cord and placental MSC-CMs, while wound healing proteins were prominent in dental pulp MSC-CM.

CONCLUSIONS

MSC-CMs from different tissues exhibit distinct protein profiles, while sharing common ECM signatures. These findings suggest that MSC-CM could be used for specific applications such as neurodegenerative diseases and wound healing, depending on the tissue source. Further in vivo research is needed to explore their clinical relevance.