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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

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Inhibition of mitochondrial ROS by TACI sustains bone marrow plasma cells.

Yiming Zhu1,2,3, Jun Chen1,2,3, Haimei Lv1,2,3

  • 1Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China.

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The cytokine receptor TACI is crucial for long-lived plasma cell (LLPC) survival, which is essential for sustained vaccine immunity. Antioxidant treatment can rescue LLPC numbers and improve vaccine efficacy.

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Area of Science:

  • Immunology
  • Cell Biology
  • Vaccinology

Background:

  • Humoral immunity relies on long-lived plasma cells (LLPCs) for sustained antibody production.
  • Mechanisms governing LLPC lifespan and vaccine-induced protection durability are not fully understood.

Purpose of the Study:

  • To investigate the role of candidate niche factors and their receptors in LLPC survival.
  • To identify novel targets for enhancing vaccine efficacy and longevity.

Main Methods:

  • Utilized plasma cell-specific conditional knockout mice to assess receptor function.
  • Evaluated the impact of TACI deficiency on plasma cell numbers and vaccine responses.
  • Investigated the role of oxidative stress in LLPC survival.

Main Results:

  • The cytokine receptor TACI is essential for LLPC survival, independent of antigen type.
  • TACI deficiency leads to increased mitochondrial reactive oxygen species (ROS) and plasma cell death.
  • Pharmacologic antioxidant treatment (N-acetylcysteine) rescues LLPC numbers and enhances vaccine efficacy in vivo.

Conclusions:

  • TACI is a critical regulator of LLPC longevity by limiting oxidative stress.
  • Targeting TACI or mitigating oxidative stress presents a promising strategy for improving vaccine durability and effectiveness.