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Carbonic anhydrase XII mediates the survival and prometastatic functions of macrophages in human hepatocellular carcinoma
Wan-Ru Ning, … , Yan Wu, Limin Zheng
Wan-Ru Ning, … , Yan Wu, Limin Zheng
Published April 1, 2022
Citation Information: J Clin Invest. 2022;132(7):e153110. https://doi.org/10.1172/JCI153110.
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Research Article Immunology Metabolism Article has an altmetric score of 1

Carbonic anhydrase XII mediates the survival and prometastatic functions of macrophages in human hepatocellular carcinoma

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Abstract

Macrophages constitute a major immune component in tumor tissues, but how these cells adapt to and survive in the nutrient-depleted and lactic acid–induced acidic tumor microenvironments is not yet fully understood. Here, we found that levels of carbonic anhydrase XII (CA12) expression were significantly and selectively upregulated on macrophages in human hepatocellular carcinoma (HCC). Transient glycolytic activation of peritumoral monocytes induced sustained expression of CA12 on tumor-infiltrating macrophages via autocrine cytokines and HIF1α pathways. On the one hand, CA12 mediated the survival of macrophages in relatively acidic tumor microenvironments, while on the other hand, it induced macrophage production of large amounts of C-C motif chemokine ligand 8 (CCL8), which enhanced cancer cell epithelial-mesenchymal transition (EMT) and facilitated tumor metastasis. Consistently, the accumulation of CA12+ macrophages in tumor tissues was associated with increased tumor metastatic potential and reduced survival of patients with HCC. Selective targeting of tumor-infiltrating macrophages with a CA12 inhibitor reduced tumor growth in mice and was sufficient to synergistically enhance the therapeutic efficacy of immune-checkpoint blockade. We suggest that CA12 activity is a previously unappreciated mechanism regulating the accumulation and functions of macrophages in tumor microenvironments and therefore represents a selective vulnerability that could be exploited in future designs for antitumor immunotherapeutic strategies.

Authors

Wan-Ru Ning, Da Jiang, Xing-Chen Liu, Yu-Fan Huang, Zhi-Peng Peng, Ze-Zhou Jiang, Tiebang Kang, Shi-Mei Zhuang, Yan Wu, Limin Zheng

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