HPV16 E6 and E7 expressing cancer cells suppress the antitumor immune response by upregulating KLF2-mediated IL-23 expression in macrophages
Background Human papillomavirus type 16 (HPV16) positive cancers have a tumor environment that induces antigen-presenting cells to increase IL-23 expression. Unclear is if HPV16 E6/E7 oncoproteins expressed in these cancers play a role in upregulating interleukin (IL)-23 in the tumor microenvironmen...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMJ Publishing Group
2025-08-01
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| Series: | Journal for ImmunoTherapy of Cancer |
| Online Access: | https://jitc.bmj.com/content/13/8/e011915.full |
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| Summary: | Background Human papillomavirus type 16 (HPV16) positive cancers have a tumor environment that induces antigen-presenting cells to increase IL-23 expression. Unclear is if HPV16 E6/E7 oncoproteins expressed in these cancers play a role in upregulating interleukin (IL)-23 in the tumor microenvironment (TME), and how this cytokine impacts the antitumor cytotoxic T-cell response in HPV16+ cancer.Methods CD8 T-cells targeting HPV16+ cancer cells were isolated from C57BL/6 mice bearing HPV16+ C3.43 tumors that were therapeutically vaccinated against HPV16 E6/E7 and incubated with IL-23. These T-cells were then co-incubated with HPV16+ target cells in a cytotoxicity assay to assess their cytolytic capacity. Additionally, carboxyfluorescein succinimidyl ester (CFSE) labeled T-cells were used to track the effect of IL-23 on their proliferation. The effect of IL-23 neutralization on vaccine-induced antitumor immunity during tumor progression was studied in vivo to assess its potential as either a standalone treatment or combined with a vaccine targeting HPV16 E6/E7. HPV16− tumors were engineered to express E6/E7 to find out if these oncoproteins upregulate IL-23. To understand how HPV oncoproteins in the TME affect transcriptional regulation of IL-23 producing cells, we used single-cell Assay for Transposase-Accessible Chromatin (ATAC)+RNA sequencing.Results Inside macrophages residing in the HPV+ TME, transcription factor enrichment and linkage analysis identified KLF2 as a potential regulator of Il23a. Overexpression of KLF2 in macrophages upregulates IL-23 production. CD8 T-cells that recognize HPV16+ cells incubated with IL-23 are inhibited in both their killing and proliferative capacities. IL-23 neutralization increased the presence of HPV-specific cytotoxic CD8 T-cells inside the HPV16+TME in an IL-17 independent manner. Combination of IL-23 neutralization followed by HPV16 E6/E7 vaccination increases survival by amplifying the anti-tumor immune response.Conclusion This study finds that the presence of HPV oncoproteins in tumor cells increases KLF2 expression in tumor-associated macrophages in vivo. It also shows that KLF2 upregulates IL-23 production in M2 macrophages, resulting in increased IL-23 levels in the TME. In addition, it is shown that elevated levels of IL-23 suppress the antitumor immune response and that IL-23 neutralization synergizes with therapeutic vaccination against HPV oncoproteins. |
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| ISSN: | 2051-1426 |