Essential functions for ID proteins at multiple checkpoints in invariant NKT cell development.
Mihalis Verykokakis1, Veena Krishnamoorthy, Antonio Iavarone
1Department of Pathology, University of Chicago, Chicago, IL 60637;
Journal of Immunology (Baltimore, Md. : 1950)
|November 19, 2013
Summary
Invariant natural killer T (iNKT) cells utilize ID proteins for development, with ID2 and ID3 redundantly promoting lineage specification and ID3 being crucial for NKT1 cell development. These proteins also limit iNKT cell numbers by enforcing checkpoints.
Area of Science:
- Immunology
- Cell Biology
- Developmental Biology
Background:
- Invariant natural killer T (iNKT) cells bridge adaptive and innate immunity.
- ID proteins antagonize E protein transcription factors essential for adaptive lymphocyte development.
- Unlike other innate lymphoid cells (ILCs), ID2 is not essential for iNKT cell development.
Purpose of the Study:
- To investigate the redundant and distinct roles of ID2 and ID3 in iNKT cell development.
- To elucidate the function of ID proteins in iNKT cell lineage specification and differentiation.
- To understand how ID proteins influence iNKT cell numbers during thymic development.
Main Methods:
- Genetic manipulation of ID gene expression in thymocytes.
- Analysis of transcription factor induction, including PLZF and TBET.
- Flow cytometry to assess iNKT cell populations and thymocyte subsets.
Main Results:
- ID2 and ID3 redundantly promote iNKT cell lineage specification via PLZF induction.
- ID3 is critical for the development of TBET-dependent NKT1 cells.
- Both ID2 and ID3 limit iNKT cell numbers by enforcing a postselection checkpoint.
Conclusions:
- iNKT cells exhibit both adaptive and innate-like requirements for ID proteins.
- ID proteins play distinct roles at different checkpoints during iNKT cell development.
- Understanding ID protein function provides insights into lymphocyte development and regulation.
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