Abstract
Elevated infiltration of tumor-associated macrophages (TAMs) drives tumor progression and correlates with poor prognosis for various tumor types. Our research identifies that the ablation of the Pim-1 proto-oncogene (PIM1) in non-small cell lung cancer (NSCLC) suppresses TAM infiltration and prevents them from polarizing toward the M2 phenotype, thereby resha** the tumor immune microenvironment (TME). The predominant mechanism through which PIM1 exerts its impact on macrophage chemotaxis and polarization involves CC motif chemokine ligand 2 (CCL2). The expression level of PIM1 is positively correlated with high CCL2 expression in NSCLC, conferring a worse overall patient survival. Mechanistically, PIM1 deficiency facilitates the reprogramming of TAMs by targeting nuclear factor kappa beta (NF-κB) signaling and inhibits CCL2 transactivation by NSCLC cells. The decreased secretion of CCL2 impedes TAM accumulation and their polarization toward a pro-tumoral phenotype. Furthermore, Dual blockade of Pim1 and PD-1 collaboratively suppressed tumor growth, repolarized macrophages, and boosted the efficacy of anti-PD-1 antibody. Collectively, our findings elucidate the pivotal role of PIM1 in orchestrating TAMs within the TME of NSCLC and highlight the potential of PIM1 inhibition as a strategy for enhancing the efficacy of cancer immunotherapy.
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Data availability
The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Tian** Medical University Cancer Institute & Hospital for providing us with pathological specimens.
Funding
This present research was funded by the National Natural Science Foundation of China (No. 82172620 for Richeng Jiang and No. 82172635 for Dingzhi Huang).
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Conceptualization: RCJ, DZH. Methodology: XQC, JZ, YHW, XYW, KDC, QC. Investigation: XQC, JZ, YHW. Acquisition of data: XQC, JZ, YHW, XYW. Visualization: XQC, XYW, KDC, QC. Funding acquisition: RCJ, DZH. Project administration: RCJ, DZH. Supervision: XYW, RCJ, DZH. Writing - original draft: XQC. Writing - review & editing or revision: XQC, JZ, YHW.
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This research involving human subjects or human data received formal authorization from the Cancer Institute and Hospital Research Ethics Committee, following the World Medical Association’s Declaration of Helsinki guidelines (approval no.bc2023134). Informed consent was obtained from all participants after the nature and possible consequences of the studies were explained. All animal experiments were approved by the Institutional Animal Care and Use Committee of the Tian** Medical University Cancer Institute and Hospital (AE-2022026).
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Chen, X., Zhou, J., Wang, Y. et al. PIM1/NF-κB/CCL2 blockade enhances anti-PD-1 therapy response by modulating macrophage infiltration and polarization in tumor microenvironment of NSCLC. Oncogene (2024). https://doi.org/10.1038/s41388-024-03100-6
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DOI: https://doi.org/10.1038/s41388-024-03100-6
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