Dry eye disease is more than occasional eye discomfort. It is a complex inflammatory condition that affects the surface of the eye and can lead to tear film instability, irritation, corneal damage, and chronic inflammation. For some people, dry eye can become severe enough to interfere with vision, comfort, daily activities, and overall quality of life.
Because inflammation plays such a major role in dry eye disease, researchers continue to explore new regenerative approaches that may help protect the cornea and support ocular-surface repair. One area of interest involves exosomes derived from umbilical cord mesenchymal stem cells, also known as UCMSC-derived exosomes.
In this study published in Biomedicines, researchers investigated whether UCMSC-derived exosomes could help protect the cornea, reduce inflammation, and support healing in a severe dry eye rat model.
What Are UCMSC-Derived Exosomes?
Umbilical cord mesenchymal stem cells are stem cells derived from umbilical cord tissue. These cells are widely studied in regenerative medicine because they release biological signals that may help regulate inflammation, support tissue repair, and improve cell communication.
Exosomes are tiny particles released by cells. They carry important biological materials such as:
- Proteins
- Lipids
- RNA
- MicroRNAs
- Growth factors
- Other signaling molecules
These exosomes act like messengers between cells. Instead of using whole stem cells directly, researchers are increasingly studying exosomes as a cell-free regenerative approach because they may carry many of the helpful signals released by stem cells.
Study Overview
In this study, researchers created a severe dry eye model in rats by surgically removing the lacrimal glands responsible for tear production. This allowed them to study dry eye disease in a controlled way and observe how the cornea responds when tear production is significantly reduced.
The rats were divided into groups. One group did not receive treatment, while the treatment group received topical UCMSC-derived exosome eye drops twice daily after surgery.
The researchers evaluated several important signs of dry eye and corneal health, including:
- Tear volume
- Corneal blood vessel growth
- Corneal staining
- Corneal abrasion
- Epithelial and stromal thickness
- Inflammatory marker expression
- Tissue-level changes in the cornea
These measurements helped researchers understand how UCMSC-derived exosomes affected both visible eye changes and deeper biological repair processes. For dry eye disease, UCMSC-derived exosomes are being studied because they may help calm inflammation and support repair of the corneal surface.
Key Findings From the Study
The study found that UCMSC-derived exosome treatment helped improve several features of severe dry eye disease in the rat model.
One major finding was reduced corneal neovascularization. Corneal neovascularization refers to abnormal blood vessel growth in the cornea. In dry eye disease, this can happen when inflammation and tissue stress affect the ocular surface. The rats treated with UCMSC-derived exosomes had significantly less corneal blood vessel formation compared with the control group.
The researchers also found that the treatment group had less corneal fluorescein staining during the first month. Fluorescein staining is commonly used to evaluate damage or disruption on the surface of the cornea. Less staining suggests improved corneal surface healing and better epithelial protection.
In addition, imaging showed that the corneal epithelial thickness in the exosome-treated group was closer to normal compared with the control group. This suggests that UCMSC-derived exosomes may help support healthier corneal structure during dry eye-related stress.
Reducing Inflammation in the Cornea
Inflammation is one of the main drivers of dry eye disease. When the tear film becomes unstable or tear production decreases, the surface of the eye can become irritated and inflamed. Over time, this inflammatory cycle can damage epithelial cells and worsen discomfort.
In this study, UCMSC-derived exosome treatment helped reduce inflammatory marker expression in the cornea. Specifically, the researchers observed reduced expression of IL-1β and TNF-α, two inflammatory cytokines commonly associated with tissue irritation and inflammatory damage.
The study also reported increased IL-10 expression early in the treatment period. IL-10 is often associated with anti-inflammatory activity and may help support a more balanced immune response.
These findings suggest that UCMSC-derived exosomes may help shift the corneal environment away from excessive inflammation and toward a more repair-supportive state.
Supporting Corneal Protection and Healing
The cornea is the clear outer surface of the eye, and it plays an important role in vision and eye protection. When dry eye becomes severe, the corneal surface can become irritated, damaged, and more vulnerable to inflammation.
The study found that UCMSC-derived exosomes helped support corneal healing in several ways. The treatment group showed:
- Reduced abnormal blood vessel formation
- Less corneal staining during early healing
- Improved epithelial thickness
- Reduced inflammatory cytokine expression
- Lower signs of corneal cell stress
- Improved tissue protection
The researchers also examined markers related to fibrosis and cell death. UCMSC-derived exosome treatment appeared to reduce epithelial apoptosis and help limit fibrotic changes in the cornea. This is important because excessive cell death or scarring can interfere with healthy corneal function.
Why This Research Matters
Dry eye disease is often treated with artificial tears, lubricating drops, anti-inflammatory medications, and other supportive therapies. These treatments can be helpful, but severe dry eye may still be difficult to manage because inflammation and tissue damage can continue over time.
This study adds to the growing interest in exosome-based regenerative medicine. Instead of only improving lubrication, UCMSC-derived exosomes may help influence the biological environment of the ocular surface.
Their potential benefits include:
- Calming excessive inflammation
- Supporting epithelial repair
- Protecting corneal structure
- Reducing tissue stress
- Improving cell communication
- Supporting a healthier ocular surface
Because this was a rat-model study, more research is needed before these findings can be fully translated into human clinical use. However, the results provide encouraging preclinical evidence that UCMSC-derived exosomes may have potential as a future cell-free regenerative approach for severe dry eye disease.
A Promising Area of Eye Health Research
Umbilical cord MSC-derived exosomes represent an exciting area of regenerative medicine research because they carry biological signals that may support healing and inflammation control. In this study, UCMSC-derived exosome eye drops helped protect the cornea, reduce inflammatory markers, and support ocular-surface repair in a severe dry eye model.
As research continues, exosome-based therapies may become an increasingly important area of study for inflammatory eye conditions, corneal protection, and regenerative approaches to ocular-surface health.
Source
Chan S-M, Tsai C, Lee T-P, Huang Z-R, Huang W-H, Lin C-T. Therapeutic potential of umbilical cord MSC-derived exosomes in a severe dry eye rat model: enhancing corneal protection and modulating inflammation. Biomedicines. 2025 May 11;13(5):1174. doi: 10.3390/biomedicines13051174. Available from: https://www.mdpi.com/2227-9059/13/5/1174
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