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Lactic acid induces dendritic cell pyroptosis through MCT-1 to promote tumor immune evasion

Abstract

Elevated metabolites in the tumor microenvironment (TME), particularly lactic acid, create an immunosuppressive milieu that promotes immune escape and tumor progression. Dendritic cells (DCs) are pivotal in initiating and regulating immune responses against tumors. However, the impact of lactic acid on DC death in the TME remains unclear. Our study reveals that lactic acid induces dose–dependent pyroptosis of bone marrow-derived DCs (BMDCs) through GSDMD cleavage. Mechanistically, this process involves monocarboxylate transporter 1(MCT1)-mediated signaling via the K+/NLRP3/GSDMD axis, facilitating immune evasion and cancer progression. Furthermore, inhibiting MCT1 attenuated lactic acid-induced DC pyroptosis both in vitro and in vivo. These findings offer mechanistic insights into how lactic acid-mediated DC pyroptosis contributes to tumor immune evasion, suggesting potential targets for enhancing cancer therapies.

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Fig. 1: Lactic acid induces DC pyroptosis in vitro.
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Fig. 2: Inhibition of DC pyroptosis induced by tumor cell culture supernatant using MCT inhibitors.
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Fig. 3: Lactic acid induces DC pyroptosis in vivo and promotes tumor growth.
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Fig. 4: Lactic acid impairs the T cell priming function of DCs.
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Fig. 5: Lactic acid induces DC pyroptosis through a K+/NLRP3/caspase-1/GSDMD axis.
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Fig. 6: Blocking MCT1-mediated lactate influx attenuates DC pyroptosis.
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Fig. 7: Lactic acid promotes tumor growth through MCT1 expression in DCs.
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Fig. 8: Lactic acid induces human DC pyroptosis.
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All data about this article were presented in the main body and the Supplementary Materials. Additional data related to this article can be requested from authors.

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Acknowledgements

We thank Dr. Shuo Yang from Nanjing Medical University and Dr. Bingwei Wang from Nanjing University of Chinese Medicine for providing the B16F10 cell line and Gsdmd−/− mice. We also thank Dr. Yangxin Fu and Dr. Yong Liang from Tsinghua University for providing CD11c-DTR mice and Dr. Zhilin Hu from Nanjing Medical University for providing Mct1fl/fl Itgax-Cre mice.

Funding

This study was supported by the Jiangsu Province Capability Improvement Project through Science, Technology and Education (ZDXK202239), National Natural Science Foundation of China (no. 82103328), Jiangsu Province Maternal and Child Health Care Association Research Project (no. FYX202348), and Project of Zhenjiang City Social Development (SH2023046).

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Contributions

Conceptualization, Jian Xu and Yuqing Wu; Methodology, Shengrui Yang, Yuqing Wu, Liyuan Lin and Xiang Zheng; Investigation, Liyuan Lin and Rong Qing; Resources, Jian Xu; Writing-Original Draft, Shengrui Yang and Liyuan Lin; Writing- Review & Editing, Shengrui Yang and Jie Li; Supervision, Jian Xu and Yuqing Wu; Funding Acquisition, Jian Xu, Yuqing Wu, and Rong Qing.

Corresponding authors

Correspondence to Yuqing Wu or Jian Xu.

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This research was approved by the Research and Ethical Committee of the First Affiliated Hospital of Nanjing Medical University (2023-SR-637). The study protocol was conducted in accordance with the Declaration of Helsinki. All the animal experiments were approved by the Institutional Animal Care and Use Committee of Nanjing Medical University (approved number: 2207049). Mice were maintained in the Research Animal Support Facility, and all animal experiments were conducted according to the protocols approved by the Institutional Animal Care and Use Committee.

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Yang, S., Lin, L., Zheng, X. et al. Lactic acid induces dendritic cell pyroptosis through MCT-1 to promote tumor immune evasion. Oncogene (2026). https://doi.org/10.1038/s41388-026-03825-6

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