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TCR-Independent Metabolic Reprogramming Precedes Lymphoma-Driven Changes in T-cell Fate.

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Poorly immunogenic tumors impair T-cell metabolism and function. Early metabolic interactions between lymphomas and T cells limit immune surveillance, impacting CD4+ T-cell function and differentiation.

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Area of Science:

  • Immunology
  • Cancer Biology
  • Metabolic Research

Background:

  • Chronic T-cell receptor (TCR) signaling in the tumor microenvironment can lead to T-cell dysfunction.
  • Poorly immunogenic tumors might compromise T-cell function by affecting their metabolism.

Purpose of the Study:

  • To investigate the temporal metabolic, fate, and functional changes in T cells within B-cell lymphoma models.
  • To understand the role of Myc in lymphoma immunogenicity and its impact on T-cell metabolism.

Main Methods:

  • Assessed temporal changes in T-cell metabolism, fate, and function in Myc-driven B-cell lymphoma models.
  • Utilized metabolomic analyses to identify metabolic reprogramming in CD4+ T cells.
  • Examined T-cell mitochondrial function in lymphoma-transplanted transgenic mice.

Main Results:

  • Increased lymphoma burden impaired CD4+ T-cell function and promoted regulatory T cell (Treg) and Th1-cell differentiation.
  • Early metabolic reprogramming, reduced glucose uptake, and impaired mitochondrial function were observed in CD4+ T cells, preceding fate changes.
  • B-cell lymphoma metabolism remained robust, while T-cell mitochondrial functions were impaired in both CD4+ and CD8+ T cells.

Conclusions:

  • Early, TCR-independent metabolic interactions with developing lymphomas limit T-cell-mediated immune surveillance.
  • Tumor-induced metabolic compromise is a key mechanism of T-cell dysfunction in poorly immunogenic cancers.
  • Targeting T-cell metabolism could be a strategy to enhance anti-tumor immunity.