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The Contribution of CD26-Negative Fibroblasts to Endometrial Scarring
Muhammad Assad Riaz1, Clara Marie Pecher1, Franziska Louisa Kary1
1Center of Gynecology and Obstetrics, Faculty of Medicine, Justus Liebig University, D-35392 Giessen, Germany.
Biomolecules
|October 29, 2025
Summary
The human endometrium regenerates without scarring, unlike fetal skin. Stromal cells lacking CD26 (a scar-associated protein) may contribute to this unique non-scarring wound healing ability.
Area of Science:
- Reproductive Biology
- Dermatology
- Cell Biology
Background:
- The human endometrium exhibits remarkable regenerative capacity, healing after menstruation without scarring.
- Fibroblast CD26 expression is implicated in scar formation in fetal skin, suggesting a potential role in endometrial healing.
Purpose of the Study:
- To investigate the role of CD26 in endometrial wound healing and scar formation.
- To determine if CD26 expression in endometrial stromal cells influences healing and extracellular matrix production.
Main Methods:
- Primary human endometrial stromal cells (HPESCs) were stimulated with IL1α to induce CD26 expression.
- ELISAs measured collagen 1 alpha 1 (COL1A1) and TGF-β3 secretion; wound healing assays assessed closure.
- The CD26 inhibitor diprotin A (DPA) was used to block CD26 activity.
Main Results:
- IL1α stimulation induced CD26 expression in HPESCs, promoting in vitro wound healing.
- CD26 induction increased COL1A1 secretion and decreased TGF-β3 secretion.
- DPA treatment reversed IL1α-induced effects, indicating CD26's role.
Conclusions:
- Stromal non-expression of CD26 may be a key factor in the endometrium's scar-free healing.
- Targeting CD26 activity could offer therapeutic strategies for promoting non-scarring wound repair.
