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Updated: Jun 22, 2026

Preparation of Tumor Antigen-loaded Mature Dendritic Cells for Immunotherapy
08:40

Preparation of Tumor Antigen-loaded Mature Dendritic Cells for Immunotherapy

Published on: August 1, 2013

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The Tumor Metabolite 5'-Deoxy-5'Methylthioadenosine (MTA) Inhibits Maturation and T Cell-Stimulating Capacity of

Christina Brummer1,2, Katrin Singer1,2, Frederik Henrich2,3

  • 1Department of Internal Medicine III, University Hospital Regensburg, 93053 Regensburg, Germany.

Cells
|January 8, 2025
PubMed

Insights

Accumulation of 5'-deoxy-5'methylthioadenosine (MTA) in tumors impairs dendritic cell (DC) maturation and function, hindering T cell responses. This metabolite affects immune evasion and immunotherapy efficacy in MTAP-deficient cancers.

Area of Science:

  • Immunology
  • Cancer Biology
  • Metabolomics

Background:

  • Metabolite accumulation in tumors promotes immune evasion, limiting immunotherapy effectiveness.
  • Methylthioadenosine phosphorylase (MTAP) deficiency leads to 5'-deoxy-5'methylthioadenosine (MTA) accumulation, inhibiting T cells and NK cells.
  • The impact of MTA on other immune cells, particularly dendritic cells (DCs), remains largely unknown.

Purpose of the Study:

  • To investigate the effects of MTA on the maturation, activation, and T cell-stimulating capacity of human dendritic cells (DCs).
  • To elucidate the underlying mechanisms by which MTA influences monocyte-derived DCs.

Main Methods:

  • Human monocytes were differentiated into DCs in the presence or absence of MTA.
  • Analysis of DC maturation markers, cytokine secretion profiles, and T cell co-stimulatory capacity.
  • Investigation of signaling pathways involved in MTA-induced effects, exploring mechanisms beyond adenosine receptor signaling.

Main Results:

  • MTA impaired monocyte maturation into DCs, altering cytokine profiles.
  • MTA-induced DCs (MTA-DCs) exhibited an immature phenotype with reduced CD80, CD83, CD86 expression and increased CD14, CD16 expression.
  • MTA-DCs displayed decreased IL-12 production and diminished capacity to stimulate T cells.
  • MTA-mediated effects on DCs were independent of adenosine receptor signaling.

Conclusions:

  • MTA accumulation significantly impairs dendritic cell maturation and function, compromising their ability to activate T cells.
  • Altered polyamine metabolism, specifically MTA accumulation, negatively impacts the tumor immune microenvironment by affecting DC-T cell crosstalk.
  • These findings offer new insights into immune evasion mechanisms in MTAP-deficient tumors and potential therapeutic targets for enhancing immunotherapy.
Keywords:
MTAT celladenosinecancer immunosurveillancedendritic cellspolyaminetumor metabolism

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