Collagen Type 1 Accelerates Healing of Ruptured Fetal Membranes

Area of Science:

• Obstetrics and Gynecology
• Regenerative Medicine
• Biomaterials Science

Background:

• Preterm premature rupture of membranes (pPROM) is a significant cause of preterm birth.
• Extracellular matrix-based therapies are emerging for wound healing applications.

Purpose of the Study:

• To evaluate the efficacy of collagen type 1 gel in treating ruptured fetal membranes in a pregnant mouse model.
• To elucidate the underlying cellular and molecular mechanisms of collagen-mediated healing in pPROM.

Main Methods:

• A pregnant mouse model was utilized to induce and treat premature rupture of fetal membranes.
• Collagen type 1 gel and PBS injections were compared for their effects on membrane closure.
• Immunohistochemistry was used to analyze macrophage phenotypes (M2).
• Primary human amnion mesenchymal cells were treated with collagen type 1 gel to assess DDR2 activation and cell migration.

Main Results:

• Collagen type 1 gel injection significantly improved fetal membrane closure rates to 90% within 72 hours, compared to 40% with PBS.
• M2 macrophages, crucial for wound healing, were observed within the collagen gel matrix.
• Collagen type 1 activated discoidin domain receptor 2 (DDR2) in human amnion mesenchymal cells, leading to myosin light chain phosphorylation and enhanced cell migration.

Conclusions:

• Collagen type 1 gel demonstrates high efficacy in promoting the healing of prematurely ruptured fetal membranes.
• The therapeutic effect involves the recruitment of M2 macrophages and activation of the DDR2 signaling pathway in amnion cells.
• Matrix-directed therapeutics, specifically collagen type 1, show promise for treating pPROM and reducing preterm birth.