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IL-10 dampens antitumor immunity and promotes liver metastasis via PD-L1 induction

ABSTRACT: Background & Aims: The liver is one of the organs most commonly affected by metastasis. The presence of liver metastasis is reported to be responsible for an immunosuppressive microenvironment and diminished immunotherapy efficacy. Here, we aimed to investigate the role of IL-10 in liver metastasis formation and decipher its therapeutic potential in affecting immunotherapy effectiveness. Methods: To induce spontaneous or forced liver metastasis in mice, murine cancer cells (MC38) or colon tumor organoids were injected into the cecum or the spleen, respectively. Mice with complete and cell-type specific deletion of IL-10- and IL-10Ra were used to identify the source and the target of IL-10 during metastasis formation. Programmed death ligand 1 (PD-L1)-deficient mice were used to test the role of this checkpoint. Flow cytometry was applied to characterize the regulation of IL-10 on PD-L1. Results: We found that Il10-deficient mice and mice treated with IL-10Ra antibodies were protected against liver metastasis formation. Furthermore, by using IL-10 reporter mice, we demonstrated that Foxp3+ regulatory T cells (Tregs) were the major cellular source of IL-10 in liver metastatic sites. Accordingly, deletion of IL-10 in Tregs, but not in myeloid cells, led to reduced liver metastasis. Mechanistically, IL-10 acted on Tregs in an autocrine manner, thereby further amplifying IL-10 production. Furthermore, IL-10 acted on myeloid cells, i.e., monocytes, and induced the upregulation of the immune checkpoint protein PD-L1. Finally, the PD-L1/PD-1 axis attenuated CD8-dependent cytotoxicity against metastatic lesions. Conclusions: Treg-derived IL-10 upregulates PD-L1 expression in monocytes, which in turn reduces CD8+ T-cell infiltration and related antitumor immunity in the context of colorectal cancer (CRC)-derived liver metastasis. These findings provide the basis for future monitoring and targeting of IL-10 in CRC-derived liver metastasis.

ORGANISM(S): Mus musculus

PROVIDER: GSE247304 | GEO | 2024/02/09

REPOSITORIES: GEO

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Project description:Aim: The aim of this study is to explore the impact of Pien Tze Huang (PZH) on enhancing T cell cytotoxicity by modulating colorectal cancer stem cell (CRC-CSC) markers, programmed death protein ligand-1 (PD-L1), and the transcription factor signal transducer and activator of transcription 3 (STAT3) protein expression in vivo, ex vivo, and in vitro. Methods: HCT116, HCT15, and SW480 cell lines were subjected to treatment with PZH, followed by assessment of cell viability and stemness through CCK8 and spheroid formation assays. Western blot and immunofluorescence techniques were employed to evaluate the expression levels of stem cell markers (DCLK1, CD133, CD44, MET, and LGR5), PD-L1, and STAT3 across three CRC cell lines and five patient-derived organoids (PDOs). Flow cytometry and western blot analyses were utilized to validate T cell expansion from both donors and CRC patients. CRC cells and CRC-PDOs, pre-treated with PZH, were co-cultured with expanded T cells from both donor and autologous peripheral blood mononuclear cells (PBMCs) respectively. The viability of CRC cells and PDOs was evaluated through Calcein-AM staining to measure fluorescence intensity and cell count following co-culture. In the syngeneic MC38 C57BL/6 xenograft model, tumor growth curve and body weight were monitored subsequent to treatment with PZH, anti-PD-1, and PZH combined with anti-PD-1. Immunohistochemistry was performed to assess protein levels of CD133, CD44, STAT3, PD-L1, CD8, and IL-6R in tumor tissue. Results: The effectiveness of PZH in reducing CRC cell viability and suppressing stemness markers, such as LGR5, CD44, MET, DCLK1, and CD133, is evident. PZH also displayed inhibitory effects on tumorigenesis in five CRC-PDOs, with varying sensitivity across cases (3 sensitive and 2 less sensitive). Moreover, PZH enhanced the cytotoxicity of donor T cells against CRC cells and rectified the cytotoxic deficiency or bolstered the cytotoxicity of autologous T cells against CRC-PDOs by downregulating PD-L1 and STAT3 protein expressi Conclusion: PZH enhances T cell-mediated killing effect by inhibiting CRC stem cell markers, PD-L1, and STAT3. Key Words: Pien Tze Huang, patient-derived organoid, colorectal cancer stem cells, programmed death protein ligand-1, signal transducer and activator of transcription 3

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IL-10 dampens antitumor immunity and promotes liver metastasis via PD-L1 induction

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