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Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting
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The RNA- and DNA-Binding Protein Y-Box Binding Protein 1 (YB-1) Regulates iNKT Cell Development.

Silvia Schulze1,2, Laura Knop1,2, Nouria Jantz-Naeem1,2

  • 1Institute of Clinical Immunology and Cell Therapeutics, Medical Faculty, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.

European Journal of Immunology
|May 19, 2026
PubMed
Summary

Y-box binding protein 1 (YB-1) is crucial for invariant natural killer T (iNKT) cell development. Its absence causes a severe reduction in iNKT cells, impairing their maturation and survival.

Keywords:
TCR signalingYB‐1apoptosisiNKT cellsthymus

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Y-box binding protein 1 (YB-1) is a key RNA/DNA-binding protein regulating gene expression post-transcriptionally.
  • Invariant natural killer T (iNKT) cells are crucial immune cells involved in various immune responses.

Purpose of the Study:

  • To investigate the role of YB-1 in the development and function of iNKT cells.
  • To elucidate the molecular mechanisms by which YB-1 influences iNKT cell maturation and survival.

Main Methods:

  • Conditional deletion of YB-1 in double-positive (DP) thymocytes.
  • Flow cytometry analysis of iNKT cell populations and subsets.
  • Assessment of cytokine production and cell apoptosis.

Main Results:

  • Conditional deletion of YB-1 led to an approximately 80% reduction in iNKT cells across multiple organs.
  • YB-1 deficiency caused accumulation at early developmental stages and loss at later stages, indicating a maturation defect.
  • Reduced per-cell cytokine production (IFN-γ, IL-4) and loss of IL-17 production were observed in YB-1-deficient iNKT cells.
  • Increased apoptosis and altered expression of key signaling molecules (CD1d, CD5, Nur77, ICOS, IL-15Rβ) were noted.

Conclusions:

  • YB-1 is essential for the postselection maturation, effector subset specification, and survival of iNKT cells.
  • YB-1 integrates TCR, co-stimulatory, and IL-15 signaling pathways critical for iNKT cell development.
  • These findings highlight YB-1 as a central regulator of iNKT cell homeostasis and function.