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Updated: Jun 11, 2025

Experimental Melanoma Immunotherapy Model Using Tumor Vaccination with a Hematopoietic Cytokine
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Craters on the melanoma surface facilitate tumor-immune interactions and demonstrate pathologic response to

Aya Ludin1,2,3, Georgia L Stirtz1,3, Asaf Tal1

  • 1Harvard Stem Cell and Regenerative Biology Department, Harvard University; Boston, MA, USA.

Biorxiv : the Preprint Server for Biology
|September 30, 2024
PubMed

Insights

Researchers discovered unique "craters" in melanoma tumors that are crucial for immunotherapy success. These B2M-rich pockets attract CD8+ T cells, enhancing cancer cell killing and predicting treatment response.

Area of Science:

  • Oncology
  • Immunology
  • Zebrafish Models

Background:

  • Immunotherapy can overcome tumor immunosuppression for cancer eradication.
  • Identifying mechanisms that facilitate immune responses during cancer treatment is critical.

Purpose of the Study:

  • To identify novel tumor microenvironment domains that facilitate immune responses during immunotherapy.
  • To investigate the role of these domains in zebrafish and human melanoma.

Main Methods:

  • Extended long-term in-vivo imaging in zebrafish.
  • High-resolution spatial transcriptomics of endogenous melanoma.
  • Multiplex imaging of human melanoma samples.

Main Results:

  • Identified crater-shaped pockets at melanoma margins, enriched with beta-2 microglobulin (B2M) and antigen recognition molecules.
  • These craters harbor the highest density of CD8+ T cells, facilitating prolonged antigen recognition.
  • Post-immunostimulatory treatment, craters enlarged and became key sites for T cell accumulation and tumor killing, dependent on B2M.
  • In human melanoma, crater presence predicted response to immune checkpoint blockade (ICB) therapy, outperforming T cell infiltration metrics.

Conclusions:

  • Melanoma craters are critical domains for facilitating anti-tumor immune responses during immunotherapy.
  • Craters serve as a potential diagnostic tool to predict immunotherapy success.
  • Targeting craters may enhance immune checkpoint blockade therapy efficacy.

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