Abstract
Lung adenocarcinoma (LUAD) is the most dominant histological subtype of lung cancer and one of the most lethal malignancies. The identification of novel therapeutic targets is required for the treatment of LUAD. Here, we showed that MYC-associated zinc-finger protein (MAZ) is upregulated in LUAD tissues. MAZ expression levels are inversely correlated with patient survival. Silencing of MAZ decreased tumor proliferation and the expression of pro-tumorigenic chemokines and Galectin-9 (Gal-9), an immune checkpoint molecule. The pro-tumorigenic chemokines and Gal-9 induce immune suppression by recruitment of myeloid cells and inhibition of T cell activation, respectively. Mechanistically, MAZ transcriptionally regulates KRAS expression and activates its downstream AKT-NF-κB signaling pathway, which is crucial for tumor progression and immune evasion. Additionally, in vivo animal models and bioinformatic analyses indicated that MAZ suppression could enhance the efficacy of immune checkpoint blockade (ICB) therapy for LUAD. Overall, our results suggest that MAZ plays an important role in regulating cell proliferation and immune evasion via KRAS/AKT/NF-κB signaling in LUAD. Our findings offer a candidate molecular target for LUAD therapy, with implications for improving the efficacy of ICB therapy.

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Data availability
The LUAD data from The Cancer Genome Atlas (TCGA) database, including the FPKM matrix and clinical information, were downloaded from UCSC Xena (http://xena.ucsc.edu/). The OAK and POPLAR RNA-seq data and relevant clinical information [47] were requested from Genentech at the European Genome-phenome Archive. The LUAD RNA-seq data for the Asian population (OncoSG cohort) [27] were downloaded from the website (https://src.gisapps.org/OncoSG/). The pre-immunotherapy RNA-seq data of non-small cell lung cancer (NSCLC) (GSE207422) were obtained from our previous study [33]. The CPTAC genomic (KRAS mutation status) and proteomic (protein matrix) data of LUAD from the supplementary tables of the paper reported by Michael et al. [48]. The raw RNA-seq data of A549-shCtrl and A549-shMAZ cells and CUT&TAG sequencing data of A549 cells were deposited in the Genome Sequence Archive in National Genomics Data Center, China National Center for Bioinformation/Beijing Institute of Genomics, Chinese Academy of Sciences (HRA007041), which is publicly accessible at https://ngdc.cncb.ac.cn/gsa-human/browse/HRA007041. The data generated in this study are available in the article and its supplementary files.
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Acknowledgements
We acknowledge Professor Hongbin Ji of the Chinese Academy of Sciences for providing the mouse KP cell line.
Funding
This research was supported by the National Natural Science Foundation of China (Grant No. 82125001, 82201948), Innovation Program of Shanghai Municipal Education Commission (Grant No. 2023ZKZD33), and the Foundation of Shanghai Pulmonary Hospital (Grant No. FKLY20004, FKYQ2308, FKCX2304).
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Yan Chen, Junjie Hu and Lele Zhang developed ideas and drafted the manuscript. Yan Chen, Jue Wang, Junjie Hu, and Xinsheng Zhu conducted the experiments and contributed to the analysis of data. Jing Zhang, Xun Zhang, Lu Han, Huansha Yu and Haiyang Hu contributed to the analysis of data. Lele Zhang, Peng Zhang, and Ke Fei supervised this study and edited the manuscript. All authors contributed to revising the manuscript and approved the final version for publication.
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All procedures involving human samples were approved by the Ethics Committee of Shanghai Pulmonary Hospital (Project number: K23-309) and performed in accordance with the ethical standards. Animal experiments were conducted under the protocols approved by the Institutional Animal Care and Use Committee of Shanghai Pulmonary Hospital (Project number: K24-002), and the animals were raised in compliance with animal welfare regulations. We confirm that all methods were performed in accordance with the relevant guidelines and regulations, and informed consent was obtained from all participants. Written informed consent for the publication of identifiable images was also obtained from the human research participants.
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Chen, Y., Zhu, X., Wang, J. et al. MAZ promotes tumor proliferation and immune evasion in lung adenocarcinoma. Oncogene 43, 3619–3632 (2024). https://doi.org/10.1038/s41388-024-03194-y
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DOI: https://doi.org/10.1038/s41388-024-03194-y