Matrix Tropism Influences Endometriotic Cell Attachment Patterns

Abstract The initiation of endometriotic lesions is not well understood or characterized because endometriosis is typically diagnosed at an advanced stage. Endometriotic lesions are most often found on pelvic tissues and organs, especially the ovaries. To investigate the role of tissue tropism on ovarian endometrioma initiation, a well‐characterized polyacrylamide microarray system is adapted to investigate the role of tissue‐specific extracellular matrix and adhesion motifs on endometriotic cell attachment, morphology, and size. The influence of cell origin (endometriotic vs non‐endometriotic) is reported, substrate stiffness mimicking aging and fibrosis, and the role of multicellular (epithelial‐stromal) cohorts on cell attachment patterns. Multiple ovarian‐specific attachment motifs are identified that significantly increase endometriotic (vs non‐endometriotic) cell cohort attachment that can be implicated in early disease etiology.