Abstract
Lymph node (LN) metastasis is a conserved feature across most solid organ malignancies and portends worse prognoses. Functionally, LN metastases induce systemic tumor-specific immune tolerance and may serve as a reservoir for distant metastases. Nonetheless, there are relatively few preclinical models for interrogating the biology of LN metastasis and its systemic effects at various stages of metastatic progression. We describe a method for modeling LN metastasis of melanoma tumors in mice that enables assessment of tumor and immune cell phenotypes and the functional roles of nodal involvement on distant metastasis. Our model comprises a family of transplantable syngeneic melanoma tumor cell lines evolved to exhibit enhanced LN metastatic potential, which can be used to probe cancer–immune interactions and test new therapeutics. We present both (i) a spontaneous LN metastasis model involving primary tumor implantation and assessment of LN colonization 21–28 d later and (ii) an experimental metastasis model involving implantation of primary tumors followed by direct intra-LN injections of tumor cells. Both models can be extended to assess the impact of LN metastasis on the development of distant metastases through asynchronous intravenous injections of tumors. Finally, we discuss experimental design considerations including when to use spontaneous or experimental models and troubleshooting consistent LN metastasis, making this model accessible for researchers with basic mouse survival-surgery skills. We highlight how LN metastasis models can be used to profile metastatic immune reprogramming, measure the impact of nodal metastases on distant metastases and assess novel anti-metastatic therapeutics.
Key points
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The procedure covers two models of LN metastasis. The spontaneous model recapitulates the metastatic cascade and can be used for mechanistic studies of the metastatic processes via the subcutaneous implantation of LN metastatic cells in mice.
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The experimental model of LN metastasis is instead preferred for studying systemic alterations in the host during the metastatic process via the administration of a subcutaneous parental non-metastatic tumor followed by intra-LN implantation of metastatic cells.
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Data availability
Cell line bulk RNA-seq data have been deposited at the Gene Expression Omnibus with accession code GSE117529.
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Acknowledgements
This work was supported by NIH grant DP2 AI177915 (to N.E.R.-F.), ARPA-H contract 1AY1AX000003 (to N.E.R.-F.). K.C.G. is an Investigator of the Howard Hughes Medical Institute. C.B.B. was supported by an Arc Institute Fellowship (Breuer). G.E.R. was supported by an NSF Graduate Research Fellowship and a Stanford Graduate Fellowship in Science & Engineering. Cell sorting/flow cytometry analysis for this project was performed on instruments in the Stanford Shared FACS Facility.
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C.B.B. and N.E.R.-F. conceived the study and wrote the manuscript. All authors reviewed and edited the manuscript. N.E.R.-F. derived the cell lines and established the protocol. C.B.B. refined the protocol and performed all experiments for anticipated results. Z.X. and A.W. assisted with flow cytometry experiments. G.E.R. and G.C.A. assisted with therapeutic testing of anticipated results. K.C.G. and N.E.R.-F. supervised the study.
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Key reference
Reticker-Flynn, N. E. et al. Cell 185, 1924–1942.e23 (2022): https://doi.org/10.1016/j.cell.2022.04.019
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Breuer, C.B., Xiong, Z., Wang, A. et al. Spontaneous and experimental models of lymph node metastasis. Nat Protoc 20, 3170–3187 (2025). https://doi.org/10.1038/s41596-025-01200-5
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DOI: https://doi.org/10.1038/s41596-025-01200-5
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