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Roquin Paralogs Differentially Regulate Functional NKT Cell Subsets.

Christoph Drees1, J Christoph Vahl2, Sabrina Bortoluzzi1

  • 1III. Medizinische Klinik für Hämatologie und Onkologie, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany.

Journal of Immunology (Baltimore, Md. : 1950)
|February 12, 2017
PubMed
Summary
This summary is machine-generated.

Roquin-1 and -2 proteins regulate natural killer T (NKT) cell development. Ablating these proteins expands NKT17 cells in the thymus but reduces mature NKT cells in the periphery.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Natural killer T (NKT) cells are crucial immune cells involved in allergic, autoimmune, and malignant diseases.
  • NKT cell development involves lineage commitment and maturation in the thymus, followed by polarization into distinct subsets (NKT1, NKT2, NKT17).
  • The regulatory mechanisms governing NKT cell subset differentiation remain largely unknown.

Purpose of the Study:

  • To investigate the role of mRNA-binding Roquin-1 and -2 proteins in regulating murine NKT cell fate decisions.
  • To elucidate how Roquin paralogs influence NKT cell development and subset polarization in the thymus and periphery.

Main Methods:

  • T cell-specific ablation of Roquin paralogs in mice.
  • Analysis of NKT cell populations in thymus and periphery.
  • Mixed bone marrow chimera experiments.
  • Assessment of cytokine secretion and protein expression in NKT cells.

Main Results:

  • T cell-specific ablation of Roquin paralogs caused a significant expansion of NKT17 cells in the thymus.
  • Peripheral mature NKT cells were largely absent in Roquin-deficient mice.
  • Roquin-1/2-deficient NKT17 cells exhibited exaggerated lineage-specific protein expression.
  • NKT17 polarization is cell-intrinsically regulated early in development, while peripheral NKT cell loss is due to extrinsic factors.
  • Roquin-deficient NKT cells showed impaired cytokine secretion compared to conventional T cells.

Conclusions:

  • Roquin-1 and -2 proteins are essential regulators of NKT cell development and function.
  • These proteins control NKT cell subset polarization and maintain NKT cell homeostasis in the thymus and periphery.
  • Roquin paralogs play a critical role in balancing NKT cell subset differentiation and function.