5-Fluorouracil upregulates cell surface B7-H1 (PD-L1) expression in gastrointestinal cancers

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5-Fluorouracil upregulates cell surface B7-H1 (PD-L1) expression in gastrointestinal cancers

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Title: 5-Fluorouracil upregulates cell surface B7-H1 (PD-L1) expression in gastrointestinal cancers
Author: Van Der Kraak, Lauren; Goel, Gaurav; Ramanan, Krishnaveni; Kaltenmeier, Christof; Zhang, Lin; Normolle, Daniel P.; Freeman, Gordon J.; Tang, Daolin; Nason, Katie S.; Davison, Jon M.; Luketich, James D.; Dhupar, Rajeev; Lotze, Michael T.

Note: Order does not necessarily reflect citation order of authors.

Citation: Van Der Kraak, L., G. Goel, K. Ramanan, C. Kaltenmeier, L. Zhang, D. P. Normolle, G. J. Freeman, et al. 2016. “5-Fluorouracil upregulates cell surface B7-H1 (PD-L1) expression in gastrointestinal cancers.” Journal for Immunotherapy of Cancer 4 (1): 65. doi:10.1186/s40425-016-0163-8. http://dx.doi.org/10.1186/s40425-016-0163-8.
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Abstract: Background: Resistance to chemotherapy is a major obstacle in the effective treatment of cancer patients. B7-homolog 1, also known as programmed death ligand-1 (PD-L1), is an immunoregulatory protein that is overexpressed in several human cancers. Interaction of B7-H1 with programmed death 1 (PD-1) prevents T-cell activation and proliferation, sequestering the T-cell receptor from the cell membrane, inducing T-cell apoptosis, thereby leading to cancer immunoresistance. B7-H1 upregulation contributes to chemoresistance in several types of cancer, but little is known with respect to changes associated with 5-fluorouracil (5-FU) or gastrointestinal cancers. Methods: HCT 116 p53+/+, HCT 116 p53−/− colorectal cancer (CRC) and OE33 esophageal adenocarcinoma (EAC) cells were treated with increasing doses of 5-FU (0.5 uM, 5 uM, 50 uM, 500 uM) or interferon gamma (IFN-γ, 10 ng/mL) in culture for 24 h and B7-H1 expression was quantified using flow cytometry and western blot analysis. We also evaluated B7-H1 expression, by immunohistochemistry, in tissue collected prior to and following neoadjuvant therapy in 10 EAC patients. Results: B7-H1 expression in human HCT 116 p53+/+ and HCT 116 p53−/− CRC cells lines, while low at baseline, can be induced by treatment with 5-FU. OE33 baseline B7-H1 expression exceeded CRC cell maximal expression and could be further increased in a dose dependent manner following 5-FU treatment in the absence of immune cells. We further demonstrate tumor B7-H1 expression in esophageal adenocarcinoma patient-derived pre-treatment biopsies. While B7-H1 expression was not enhanced in post-treatment esophagectomy specimens, this may be due to the limits of immunohistochemical quantification. Conclusions: B7-H1/PD-L1 expression can be increased following treatment with 5-FU in gastrointestinal cancer cell lines, suggesting alternative mechanisms to classic immune-mediated upregulation. This suggests that combining 5-FU treatment with PD-1/B7-H1 blockade may improve treatment in patients with gastrointestinal adenocarcinoma.
Published Version: doi:10.1186/s40425-016-0163-8
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5067917/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:29408279
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