Decidualization-empowered ECM hydrogel integrating sustained Tβ4 release drives endometrial regeneration in intrauterine adhesions.
This study investigated a novel hydrogel-based therapy for intrauterine adhesions (IUA), a condition where uterine scarring causes infertility. The researchers engineered a hydrogel combining two components: a bioactive extracellular matrix derived from decidualized endometrium (DEndo-UdECM) and the anti-fibrotic peptide Thymosin β4 (Tβ4), designed for sustained local release. Using a mouse model of IUA, the study reported that a single administration of the hydrogel restored normal endometrial tissue architecture, reduced fibrosis, and resulted in near-complete fertility recovery in treated animals. Mechanistic investigations suggested the hydrogel worked by shifting macrophage polarization toward an anti-inflammatory M2 phenotype, suppressing pyroptosis-driven inflammation, and inhibiting the TGF-β/Smad3 signaling pathway, which drives fibrotic scarring. The study's primary limitation is that all experimental work was conducted in a murine model, meaning the findings have not yet been validated in humans or large-animal models. Whether the regenerative and anti-fibrotic effects, as well as the fertility outcomes, would translate to human patients remains unknown. Nonetheless, the study provides a mechanistically detailed preclinical proof-of-concept for a biomaterial strategy targeting the root pathology of IUA.
Why this grade: All experiments were performed in a murine IUA model with no human subjects or clinical data reported, limiting evidence to animal-only grade.
Intrauterine adhesions (IUA), a leading cause of female infertility, result from a pathological switch in the uterine injury response from regeneration to fibrotic scarring. Current treatments are often inadequate as they fail to address this fundamental shift. Here, we report a "decidualization-empowered" hydrogel that reverses this pathology by synergistically combining a bioactive extracellular matrix from decidualized endometrium (DEndo-UdECM) with the sustained release of the anti-fibrotic peptide Thymosin β4 (Tβ4). In a murine IUA model, a single administration of the hydrogel restores endometrial architecture, resolves fibrosis, and, most critically, leads to a near-complete recovery of fertility. Mechanistically, the hydrogel orchestrates a pro-regenerative niche by reprogramming macrophages to an M2 phenotype while dually inhibiting pyroptosis-driven inflammation and the canonical TGF-β/Smad3 fibrotic cascade. Together, these findings demonstrate that mimicking the biological intelligence of a physiological niche can resolve complex fibrotic diseases and restore organ function.
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