Towards rebuilding vaginal support utilizing an extracellular matrix bioscaffold.

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Pelvic Floor Surgery

Background:

• Pelvic organ prolapse (POP) affects many women due to the failure of vaginal supportive tissues.
• Current treatments often involve synthetic meshes, which can have complications.
• Regenerative approaches using bioscaffolds are being explored to restore native tissue support.

Purpose of the Study:

• To evaluate the efficacy of an extracellular matrix (ECM) bioscaffold (MatriStem™) for vaginal prolapse repair in a macaque model.
• To compare transvaginal and transabdominal insertion methods.
• To assess the impact on vaginal structure, function, and host immune response.

Main Methods:

• Surgical transection of uterosacral ligaments and paravaginal attachments in 16 macaques.
• Implantation of a 6-ply MatriStem™ bioscaffold using transvaginal (with incisions) or transabdominal (no incisions) approaches.
• Evaluation of vaginal tissue at three months post-implantation, including biochemical, biomechanical, histological, and immunological assessments.

Main Results:

• Both insertion methods promoted tissue band formation, restoring apical (Level I) and lateral (Level II) support.
• Transabdominal insertion (no incisions) resulted in vaginal parameters similar to sham controls.
• Transvaginal insertion (with incisions) led to decreased vaginal stiffness, reduced collagen content, and altered collagen subtypes, with increased MMP2 activity in both MatriStem groups.

Conclusions:

• Extracellular matrix bioscaffolds can effectively rebuild vaginal support structures in POP repair.
• Transabdominal insertion appears to preserve vaginal structural integrity better than transvaginal insertion with incisions in the short term.
• Further research is needed to optimize bioscaffold delivery methods for vaginal prolapse treatment.