What question did this study set out to answer?

The research examines how tumor-derived metabolites affect dendritic cell behavior and maturation in the tumor environment.

April 5, 2026

Abstract 6787: Metabolic reuse of tumor-derived signals coordinates dendritic cell function

Key Points

The research examines how tumor-derived metabolites affect dendritic cell behavior and maturation in the tumor environment.
Examined the role of cholesterol and polyamines in dendritic cell functioning.
Analyzed plasma membrane reorganization in dendritic cells.
Investigated the mechanisms of antigen internalization in dendritic cells.
Dendritic cells utilize cholesterol from tumor cells to enhance their maturation.
Polyamines in tumors significantly increase the ability of dendritic cells to uptake antigens.
The metabolic interactions between tumors and dendritic cells are crucial for efficient immune responses.

Abstract

Abstract Dendritic cells (DCs) are central initiators of antitumor immunity, requiring not only the efficient acquisition of tumor antigens but also the activation of maturation programs that license them to prime T cells. Beyond capturing cellular debris, DCs can repurpose tumor-derived metabolites to support these immunogenic functions, yet how this metabolic reuse shapes DC behavior within the tumor microenvironment remains unclear. We show that DCs mobilize cholesterol recovered from tumor cells (together with newly synthesized pools) to reorganize their plasma membrane and assemble lipid nanodomains that potentiate signaling pathways essential for full maturation. In parallel, polyamines enriched in the tumors act as complementary metabolic cues that facilitate the capacity of DCs to internalize antigens through a Rac-dependent mechanism. Together, these findings reveal that DCs integrate multiple tumor-derived metabolites to tightly couple antigen acquisition with the structural and signaling transitions that drive their maturation. This metabolic cross-talk between tumors and DCs emerges as a key determinant of effective immune priming and highlights cholesterol flux and polyamine pathways as potential targets to enhance DC-mediated antitumor immunity. Citation Format: Meriem Belabed, Chang Y. Moon, Matthew D. Park, Cedric Blouin, Sreekumar Balan, Manan krishnamurthy, Grace Freed, Miguel Quijada-lamo, Jessica Le Berichel, Sourav Ghosh, Carla Rothlin, Thomas Urban Marron, Elvin Wagenblast, Nina Bhardwaj, Christophe Lamaze, Daniel J. Puleston, Miriam Merad. Metabolic reuse of tumor-derived signals coordinates dendritic cell function abstract. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 6787.

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