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Mechanistic target of rapamycin complex 1 is critical for invariant natural killer T-cell development and effector

Jinwook Shin1, Shang Wang, Wenhai Deng

  • 1Departments of Pediatrics and Immunology, Duke University Medical Center, Durham, NC 27710.

Proceedings of the National Academy of Sciences of the United States of America
|February 12, 2014
PubMed

Insights

Mammalian target of rapamycin complex 1 (mTORC1) is essential for invariant natural killer T (iNKT)-cell development and function. Ablating mTORC1 signaling severely impairs iNKT-cell numbers, proliferation, and cytokine production, impacting immune responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Invariant natural killer T (iNKT) cell development and function mechanisms remain largely unknown.
  • Mammalian target of rapamycin (mTOR) is a key regulator of cellular processes, integrating environmental signals.
  • mTOR signaling pathways are crucial for immune cell homeostasis and function.

Purpose of the Study:

  • To investigate the role of mTOR complex 1 (mTORC1) signaling in iNKT-cell development and function.
  • To determine the impact of mTORC1 pathway disruption on iNKT-cell numbers, proliferation, and effector functions.
  • To elucidate the downstream molecular mechanisms, including transcription factor regulation, affected by mTORC1 signaling in iNKT cells.

Main Methods:

  • Conditional deletion of Raptor, a component of mTORC1, in iNKT cell precursors.
  • Assessment of iNKT-cell development, numbers, and distribution in thymus and periphery.
  • In vitro and in vivo functional assays measuring iNKT-cell proliferation and cytokine production upon stimulation.
  • Analysis of liver inflammation in an iNKT cell-mediated hepatitis model.
  • Evaluation of promyelocytic leukemia zinc-finger (PLZF) localization and function in Raptor-deficient iNKT cells.

Main Results:

  • Conditional ablation of Raptor (mTORC1 component) caused severe defects in early iNKT-cell development.
  • Significant reductions in iNKT-cell numbers were observed in both thymus and peripheral tissues.
  • Loss of Raptor impaired iNKT-cell proliferation and cytokine production following stimulation.
  • Raptor deficiency inhibited iNKT cell-mediated liver inflammation.
  • Aberrant intracellular localization and impaired function of the transcription factor PLZF were noted in deficient iNKT cells.

Conclusions:

  • mTORC1 signaling is indispensable for the proper development of iNKT cells.
  • mTORC1 plays a critical role in regulating iNKT-cell proliferation, cytokine production, and effector functions.
  • Disruption of mTORC1 signaling impacts iNKT-cell-mediated immune responses, including inflammatory conditions.
  • The findings highlight mTORC1 as a key regulator directing iNKT-cell lineage development and effector programs, potentially through transcription factor modulation.
Keywords:
IFN-γIL-4PLZFTNFα

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