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SPP1+ TAM subpopulations in tumor microenvironment promote intravasation and metastasis of head and neck squamous cell carcinoma

Abstract

Macrophages are heterogeneous cells that play multifaceted roles in cancer progression and metastasis. However, the phenotypic diversity of tumor-associated macrophages (TAMs) in head and neck squamous carcinomas (HNSCC) remains poorly characterized. Here, we comprehensively analyzed the HNSCC single-cell transcriptomic dataset (GSE172577) and identified 5 subsets of myeloid-driven cells as TAMs using Seurat. Deciphering the lineage trajectory of TAMs, we revealed that FCN1+ TAMs could give rise to pro-angiogenesis SPP1+CCL18+ and SPP1+FOLR2+ populations through SPP1CCL18+ and CXCL9+CXCL10+ TAMs. SPP1+CCL18+ and SPP1+FOLR2+ TAMs harbored pro-angiogenic and metastatic transcriptional programs and were correlated with poor survival of HNSCC patients. Our immunostaining examination revealed that infiltration of SPP1+ TAMs is associated with lymph node metastasis and poor prognosis in patients with HNSCC. Cell-cell communication analysis implied that SPP1+ TAM populations may employ SPP1 signaling to activate metastasis-related ECs. In vitro and in vivo studies, we demonstrated that SPP1hi TAMs enhanced tumor intravasation and metastasis in HNSCC in a manner dependent on the secretion of SPP1, CCL18, and CXCL8. Taken together, our study characterized the cellular heterogeneity of TAM populations and identified two SPP1+ TAM populations that play key roles in HNSCC intravasation and metastasis and serve as predictive markers for patients with HNSCC.

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Fig. 1: Landscape of myeloid cells in human HNSCC.
Fig. 2: The transition states of TAM populations in HNSCC.
Fig. 3: Clinical significance of SPP1+ TAMs in HNSCC patients.
Fig. 4: Cell-cell interactions among tumor cells, TMAs, and ECs in HNSCC.
Fig. 5: SPP1hi TAMs promote the intravasation and metastasis of HNSCC.
Fig. 6: SPP1hi TAMs interplays with CD44+ tumor cells during intravasation in HNSCC.
Fig. 7: CCL18 and CXCL8 are necessary for SPP1hi TAMs-mediated intravasation and metastasis in HNSCC.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China grants (No.82203736), the Natural Science Foundation of Guangdong Province (2023A1515010399) and the China Postdoctoral Science Foundation (No. 2022M723595).

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YL, GL and JW were responsible for the experimental design. JW and YS performed the in vitro experiments and animal experiments. JW and GZ evaluated immunostaining experiments of the patient tissues. JW and YL performed the statistical analyses. JW, YL, and GL wrote the manuscript with input from all authors.

Corresponding authors

Correspondence to Yujie Liang or Guiqing Liao.

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The authors declare no competing interests.

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All procedures using human tissues or animal studies were approved by the Subcommittee on Research and Animal Care of the Hospital of Stomatology, Sun Yat-sen University. (approval no. # KQEC-2022–77-01). Clinical samples and data were obtained with written consent from each patient. All studies were conducted in accordance with the Declaration of Helsinki and local legislation.

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Wu, J., Shen, Y., Zeng, G. et al. SPP1+ TAM subpopulations in tumor microenvironment promote intravasation and metastasis of head and neck squamous cell carcinoma. Cancer Gene Ther 31, 311–321 (2024). https://doi.org/10.1038/s41417-023-00704-0

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