Tiny Messengers With Big Potential
Healthy skin is constantly repairing, renewing, and adapting. Behind the scenes, skin cells communicate through biological signals that help coordinate many of these processes.
One area gaining attention in regenerative medicine involves small extracellular vesicles, or sEVs. These tiny particles are released by cells and carry proteins and other biological signals that can influence the behavior of nearby cells.
A 2025 study explored sEVs produced by umbilical cord-derived mesenchymal stromal cells (UC-MSCs) and looked at how they might influence two areas important to skin health: the skin’s supportive structure and pigmentation.
Taking a Closer Look at Skin Cells
Rather than testing the treatment in patients, researchers used laboratory models involving human cells. They examined how UC-MSC-derived sEVs affected human dermal fibroblasts, which are cells that play an important role in maintaining and repairing the skin’s structural framework.
Researchers looked at several factors, including:
- Cell growth and movement
- Production of components involved in the skin’s supportive matrix
- Antioxidant activity
- Melanin production and pigmentation
They also used an ex vivo skin model to see how well the extracellular vesicles could move through the skin when applied topically.
Encouraging Effects on Skin Support
One of the more interesting findings involved fibroblast growth. At higher concentrations, the UC-MSC-derived sEVs increased the proliferation of human dermal fibroblasts. Because fibroblasts are closely involved in maintaining the skin’s structure and responding to tissue damage, encouraging healthy fibroblast activity is an area of interest in regenerative skin research.
The researchers also found changes in genes involved in the extracellular matrix, the network of proteins and other materials that gives skin its structure and support.
Levels of collagen type I and III did not significantly change. However, the sEVs increased the expression of fibronectin and certain enzymes involved in remodeling the skin’s extracellular matrix.
In simpler terms, the vesicles appeared to influence how skin cells manage and reorganize some of the materials surrounding them, an important part of normal tissue renewal and repair.
An Interesting Effect on Pigmentation
The study also explored whether the extracellular vesicles could influence melanin, the natural pigment responsible for skin color.
Researchers found that UC-MSC-derived sEVs produced a dose-dependent reduction in melanin production. Higher amounts of the vesicles were associated with greater reductions in pigmentation within the laboratory model. Importantly, the treatment did not increase the growth of the pigment-producing cells being studied.
These findings are very interesting for regenerative aesthetics because uneven pigmentation and changes in skin appearance can develop alongside aging, inflammation, or tissue injury. The results suggest that UC-MSC-derived extracellular vesicles may have biological effects that extend beyond tissue support to include pigmentation pathways as well.
One Challenge Researchers Discovered
The study also revealed an important hurdle for future research. When the extracellular vesicles were applied directly to the surface of the ex vivo skin model, they did not penetrate through the skin barrier. Even after 18 hours, the vesicles remained mainly within the outermost layer of the skin.
That finding does not eliminate their potential, but it suggests that simply applying these vesicles to the skin may not be enough. Future research may need to explore better delivery methods that allow them to reach deeper areas where they could interact with target cells.
A Growing Area of Regenerative Skin Research
This study provides an interesting look at how the tiny signals released by umbilical cord MSCs may influence skin biology without using the cells themselves.
UC-MSC-derived extracellular vesicles encouraged fibroblast growth, influenced the skin’s supportive matrix, and reduced melanin production in laboratory models. Together, these findings suggest possible future applications in areas such as skin rejuvenation, pigmentation management, and scar-related research.
Because this was an early preclinical study, more research will be needed to determine how these effects translate into treatments for people. Still, the findings provide another example of how regenerative medicine is increasingly exploring not only stem cells, but also the powerful biological messages those cells release.
Source
Kee LT, Foo JB, How CW, et al. Umbilical Cord Mesenchymal Stromal Cell-Derived Small Extracellular Vesicles Modulate Skin Matrix Synthesis and Pigmentation. International Journal of Nanomedicine. 2025;20:1561–1578. doi: 10.2147/IJN.S497940. PMID: 39931529; PMCID: PMC11807784. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC11807784/
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