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Séminaires

Julie Bonnereau

PhD student – INSERM U1160, Intestinal Immunity in Inflammation and Cancer - Hôpital Saint Louis, Paris 

« Targeting the CD39/CD73 adenosinergic pathway in human colorectal cancer increased T cell infiltration and tumor destruction in an autologous coculture model »

« The 3IC team works on the intestinal immunity in inflammation and cancer, and more specifically on T cells. The intestine presents a particular immune system, constantly stimulated by exogenous antigens from food, commensal microbiota or pathogens. Specific regulations balance the immune response between tolerance of microbiota and food antigens, and protection against pathogens. This immune homeostasis is crucial and its perturbation are involved in several pathologies. Upon epithelial stress and continuous inflammation, an abnormal proinflammatory immune response can induce autoimmune reactions and chronic inflammation diseases, whereas an excessive tolerant phenotype established an immunosuppressive microenvironment favourable to cancer progression. In this tumor context, an antitumor T cell response is clearly engaged but the upregulation of immunosuppressive markers, like the immune checkpoints, allow the tumor immune escape. Immunotherapies targeting these markers, anti-PD-1 and anti-CTLA-4, were developed but presented a weak efficacy in colorectal cancer (CRC).  New therapeutic strategies are necessary. In this project, we studied the antitumor T cell response involved in human CRC. Based on a prospective cohort, our objectives were to better characterize this response to find new potential target for immunotherapy and test their efficacy in our innovative autologous coculture model. We focused on several different pathways including CD39 and CD73. »

Contact IRCM : Laurent GROS