Education of tumour-associated macrophages by the tumour matrisome inhibits immune surveillance

Metastatic ovarian tissues represent a complex tumour microenviroment. We analysed the tumour matrisome and immune cell environment in 39 metastatic ovarian tissues. We developed a disease score system, which positively correlated with the tumour matrisome. A distinct matrisome signature was identfied with increasing disease. Immune abundance and phenotype positively correaletd with tumour matrisome components. We developed a decellularised tissue model using metastatic ovarian omental tissues that maintained ECM protein content and architecture and cultured human blood-derived macrophages derived from four different donors. Monocytes cultured on high diseased tissues differerntiated into a distinct macrophage population, different from uninvovled (low disease) samples. Tumour ECM cultured macrophages had pro-tumorgenic phenotype and function. Overall design: Decellularised tissue from ovarian high grade serous omental metastasis (n = 4) or from adjacent normal omenum (n =4) was used as substrate for culture of human blood-derived macrophages derived from four different donors.