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Augmented Antitumor Effect of Unripe Rubus coreanus Miquel Combined with Oxaliplatin in a Humanized PD-1/PD-L1 Knock-In Colorectal Cancer Mouse Model

Published:14 September 2022 DOI: 10.3390/cells11182876 PMID: 36139451
Eun-Ji Lee, Ju-Hye Yang, Jang-Gi Choi, Hwan-Suck Chung

Abstract

Immune checkpoint inhibitors (ICIs) have been shown to be extraordinarily effective in patients with colorectal cancer (CRC). However, the current ICIs still have adverse effects and limited efficacy of ICI monotherapy. We used a natural product to overcome the vulnerability of ICIs and tried a combination therapy with oxaliplatin to enhance the programmed death-1/programmed death-ligand 1 (PD-1/PD-L1) blockade anticancer effect. In the present study, we evaluated the T cell-mediated antitumor immunity with Unripe Rubus coreanus Miquel extract (RCE), which exerts anticancer properties via PD-1/PD-L1 blockade, combined with oxaliplatin in a co-culture cell model and allograft tumor humanized PD-1 mice. We found that RCE plus oxaliplatin apparently activates hPD-1 tumor-infiltrating CD8+ T cells, resulting in elevations of released interleukin-2 (IL-2) and granzyme B (GrB), and kills hPD-L1 MC38 CRC cells. RCE plus oxaliplatin considerably reduced tumor growth in humanized PD-1/PD-L1-expressing mouse MC38 CRC allograft. Moreover, RCE plus oxaliplatin remarkably increased the infiltration of CD8+ T cells in tumor tissues, as well as increasingly produced GrB of tumor-infiltrating CD8+ T cells in the tumor microenvironment. Our study delineated combination therapy with RCE as a PD-1/PD-L1 blockade and oxaliplatin to improve the response to immune checkpoint blockade therapy in conjunction with standard chemotherapy regimens in CRC.

Substances (4)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Oxaliplatin 61825-94-3 C8H12N2O4Pt 665 suppliers $17.00-$2180.00
Oxaliplatin 61825-94-3 C8H12N2O4Pt 665 suppliers $17.00-$2180.00
Oxaliplatin 61825-94-3 C8H12N2O4Pt 665 suppliers $17.00-$2180.00
Oxaliplatin 61825-94-3 C8H12N2O4Pt 665 suppliers $17.00-$2180.00

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