Osteopontin in colitis-associated carcinoma
Manna, S.; Sehn, M.; Cardoso da Silva, D.; Wiese, J. J.; Heldt, C.; Plumbom, I.; Conrad, T.; Husemann, C. C.; Kleo, K.; Derezanin, L.; Dony, V.; Farahani, S. K.; Weiss, F.; Kuehl, A. A.; Schallenberg, S.; Weiner, J.; Elezkurtaj, S.; Weixler, B.; Groene, J.; Siegmund, B.; Hummel, M.; Schumann, M.
Show abstract
Patients with ulcerative colitis (UC) and Crohns disease (CD) face a lifelong risk of developing colitis-associated carcinoma (CAC). Current insights into CAC development originate from murine CAC models, while human CAC studies primarily focus on mutational analysis of patient samples. Although the mutational landscape reveals distinct patterns and frequencies compared to colorectal cancer, it falls short in elucidating the inflammatory mechanisms of CAC development. Consequently, we adopted a multi-omics approach to unravel CAC carcinogenesis from an immunological perspective. Our data revealed a robust upregulation of SPP1 gene in CAC at both RNA and protein levels, expressed by CD68+ macrophages. In vitro OPN stimulation demonstrated no direct effect on intestinal epithelial organoids. However, the mutually exclusive spatial location of SPP1/OPN+ macrophages and CD8+ T cells suggests a crucial indirect role of SPP1/OPN in mediating an immunosuppressive tumour microenvironment.
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