Unveiling Vaginal Fibrosis: A Novel Murine Model Using Bleomycin and Epithelial Disruption

Area of Science:

• Reproductive biology
• Oncology
• Biomaterials science

Background:

• Vaginal fibrosis from cancer therapy causes significant physical and psychoemotional distress.
• Developing reproducible and cost-effective animal models for vaginal fibrosis is crucial for research.

Purpose of the Study:

• To establish a reproducible murine model for vaginal fibrosis using bleomycin instillations and mucosal disruption.
• To analyze the temporal and spatial changes in gene expression and collagen content during fibrosis induction and recovery.

Main Methods:

• Repeated high-dose bleomycin instillations combined with epithelial disruption in murine vaginal tissue.
• Analysis of fibrosis-related gene expression (e.g., Acta2, Col1a1, Col3a) and collagen content via trichrome staining.
• Assessment of hyaluronan (HA) size and mass distribution at various time points (1 day, 3 weeks, 6 weeks).

Main Results:

• High-dose bleomycin with epithelial disruption induced significant vaginal fibrosis within 3 weeks.
• Increased profibrotic gene expression and collagen content were observed at 3 weeks.
• Vaginal tissue demonstrated full recovery by 6 weeks, indicating regenerative capacity.

Conclusions:

• The combination of bleomycin and epithelial disruption effectively induces vaginal fibrosis in mice.
• This model allows for the study of fibrosis development and the vagina's regenerative potential.
• Findings highlight the potential for targeted therapies to manage treatment-induced vaginal fibrosis.