Article Text
Abstract
Objective T cells are major effectors of the antitumoural immune response. Their activation by tumour-associated antigens can unleash their proliferation and cytotoxic functions, leading to tumour cell elimination. However, tumour-related immunosuppressive mechanisms including the overexpression of immune checkpoints like programmed cell death protein-1 (PD-1), are also engaged, promoting immune escape. Current immunotherapies targeting these pathways have demonstrated weak efficacy in colorectal cancer (CRC). It is thus crucial to find new targets for immunotherapy in this cancer type.
Design In a prospective cohort of patients with CRC, we investigated the phenotype of tumour-related and non-tumour related intestinal T cells (n=44), particularly the adenosinergic pathway, correlating with clinical phenotype. An autologous coculture model was developed between patient-derived primary tumour spheroids and their autologous tumour-associated lymphocytes. We used this relevant model to assess the effects of CD39 blockade on the antitumour T cell response.
Results We show the increased expression of CD39, and its co-expression with PD-1, on tumour infiltrating T cells compared with mucosal lymphocytes. CD39 expression was higher in the right colon and early-stage tumours, thus defining a subset of patients potentially responsive to CD39 blockade. Finally, we demonstrate in autologous conditions that CD39 blockade triggers T cell infiltration and tumour spheroid destruction in cocultures.
Conclusion In CRC, CD39 is strongly expressed on tumour infiltrating lymphocytes and its inhibition represents a promising therapeutic strategy for treating patients.
- COLORECTAL CANCER
- CANCER IMMUNOBIOLOGY
- IMMUNOTHERAPY
- INTESTINAL T CELLS
- EPITHELIAL CELLS
Data availability statement
Data are available upon reasonable request.
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Data availability statement
Data are available upon reasonable request.
Footnotes
Contributors Conceptualisation: LLB, JB, TC, AT and MA. Methodology: JB, TC, PB, RR and LLB. Investigation: JB, TC, NA, DS, JL, JV-C and RR. Resources: JB, VC, NA, DS, JV-C, JL, MB, CB, HC, LM and PC. Formal analysis: JB and TC. Writing—original draft: JB and LLB. Writing—review and editing: TC, TA, MA, PB and LLB. Funding acquisition: MA, LLB and TA. Supervision: MA, LLB and TA. Guarantor: MA, LLB and TA
Funding AT was supported by the French Government’s Investissement d’Avenir Program, Laboratoire d’Excellence ‘Milieu Intérieur’ Grant ANR-10- LABX-69-01. INSERM U1160 is a member of OPALE Carnot Institute. This work was financially supported by grants from Innate Pharma and La Ligue contre le Cancer, Ile de France.
Competing interests MA received grant supports from Innate Pharma, Janssen, Takeda and Genentech/Roche; and honorarium from teaching activities or consultancy from AbbVie, Amgen, Biogen, Boehringer Ingelheim, Bristol Myers Squibb, Celgene, Celltrion, Ferring, Genentech, Gilead, IQVIA, Janssen, Novartis, Pfizer, Roche, Takeda, Tillots. TA presented conferences for Shire, Ipsen, Amgen, BMS, Servier, Pfizer, Roche Sanofi and meeting grants for Ipsen, Novartis, Roche and Hospira. He also obtained research grant from Novartis and Innate Pharma. MB, RR and CB were/are Innate Pharma employees.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Not commissioned; externally peer reviewed.
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