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TRAF3 deficiency promotes metabolic reprogramming in B cells.

Nurbek Mambetsariev1,2,3, Wai W Lin1,3, Alicia M Wallis1,3

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Tumor suppressor TRAF3 (TNF receptor-associated factor 3) deficiency reprograms B cells to utilize more glucose. Inhibiting this metabolic shift reduces B cell survival, suggesting new therapeutic strategies for lymphoma.

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Area of Science:

  • Immunology
  • Cell Biology
  • Metabolic Regulation

Background:

  • TNF receptor-associated factor 3 (TRAF3) is crucial for B lymphocyte survival.
  • TRAF3 deficiency in B cells leads to increased viability and is linked to lymphoma and multiple myeloma development.

Purpose of the Study:

  • To investigate the metabolic consequences of TRAF3 deficiency in B cells.
  • To explore the role of metabolic reprogramming in TRAF3-deficient B cell survival and potential therapeutic interventions.

Main Methods:

  • Analysis of glucose metabolism proteins (Glut1, Hexokinase 2) and glucose uptake in TRAF3-deficient B cells.
  • Assessment of B cell viability under conditions of metabolic inhibition or glucose deprivation.
  • Investigation of the involvement of NF-κB inducing kinase (NIK) in TRAF3-deficient B cell phenotypes.

Main Results:

  • TRAF3 deficiency induced Glut1 and Hexokinase 2, increasing glucose uptake and utilization (glycolysis and oxidative phosphorylation).
  • Inhibition of glucose metabolism or glucose deprivation attenuated the enhanced survival of TRAF3-deficient B cells by decreasing Mcl-1 levels.
  • These metabolic and survival changes were dependent on NF-κB inducing kinase (NIK).

Conclusions:

  • TRAF3 deficiency metabolically reprograms B cells, enhancing their survival.
  • TRAF3 acts as a tumor suppressor by regulating B cell metabolism.
  • Targeting B cell glucose metabolism presents a potential therapeutic strategy for TRAF3-related malignancies.