Thy1 (CD90) Expression Is Elevated in Radiation-Induced Periprosthetic Capsular Contracture: Implication for Novel...

Area of Science:

• Biomedical Engineering
• Plastic Surgery
• Oncology

Background:

• Capsular contracture is a severe complication following implant-based breast reconstruction.
• Radiotherapy significantly elevates capsular contracture rates, posing a clinical challenge.
• Thy1 (CD90) is implicated in myofibroblast differentiation and scar formation, but its role in radiation-induced contracture is unclear.

Purpose of the Study:

• To investigate the impact of radiotherapy on Thy1 expression in capsular contracture.
• To determine the role of Thy1 in myofibroblast phenotype in capsular fibroblasts.
• To evaluate the potential of salinomycin as an antiscarring agent targeting Thy1.

Main Methods:

• Analysis of Thy1 expression in human capsular tissue and fibroblasts using qPCR, Western blotting, and immunohistochemistry.
• RNA interference to deplete Thy1 and assess its necessity for myofibroblast phenotype.
• Treatment of capsular fibroblasts with salinomycin to evaluate its effect on Thy1 expression and myofibroblast formation.

Main Results:

• Radiation therapy significantly upregulated Thy1 mRNA and protein in periimplant scar tissue.
• Thy1 depletion reduced fibrotic morphology and decreased levels of α-smooth muscle actin and collagen in capsular fibroblasts.
• Salinomycin treatment effectively decreased Thy1 expression and inhibited myofibroblast formation.

Conclusions:

• Ionizing radiation-induced Thy1 overexpression contributes to the severity of capsular contracture.
• Targeting Thy1 expression can ameliorate fibroblast scar production.
• Salinomycin demonstrates potential as a therapeutic agent for radiation-induced capsular contracture.