Platelet-driven immunothrombotic remodeling programs convert ectopic endometrium into fibrotic, immune-privileged...

Area of Science:

• Reproductive biology
• Immunology
• Fibrosis research

Background:

• Endometriosis is a complex disorder characterized by ectopic endometrial tissue, leading to chronic pain and infertility.
• Current understanding inadequately explains lesion fibrotic maturation and spatial heterogeneity, highlighting a need for new mechanistic paradigms.

Purpose of the Study:

• To propose a unifying mechanistic paradigm for endometriosis, reframing it as a platelet-organized immunofibrotic disorder.
• To identify novel therapeutic targets and biomarker strategies for endometriosis management.

Main Methods:

• Synthesis of human, experimental, and spatial-omic evidence.
• Quantitative histology and Second Harmonic Generation (SHG) imaging to analyze lesion architecture.
• Proteomic analysis of platelet-derived microparticles (PMPs) and functional uptake assays.

Main Results:

• Cyclical bleeding creates an immunothrombotic niche where platelets and fibrin organize immune cells and stromal responders.
• Platelet-derived signals (P-selectin, TGF-β, PMPs) drive immune dysregulation and fibrogenic reprogramming.
• Spatial platelet hotspots correlate with NK cell suppression, M2 macrophage polarization, and aligned collagen.
• PMP cargo influences myofibroblast and reparative macrophage programs, downregulating NK receptors and promoting matrix remodeling.

Conclusions:

• Endometriosis can be viewed as an "immunofibrotic" disorder driven by platelet activity.
• Targeting platelet adhesion (P-selectin), PMP biology, TGF-β activation, or LOX presents potential therapeutic avenues.
• This reframing offers novel druggable nodes and biomarker strategies for endometriosis research and clinical practice.