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A High Resolution Method to Monitor Phosphorylation-dependent Activation of IRF3
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Control of nutrient uptake by IRF4 orchestrates innate immune memory
Endi K Santosa1,2, Hyunu Kim1, Timo Rückert3
1Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
Nature Immunology
|September 11, 2023
Summary
The transcription factor IRF4 integrates signals to coordinate natural killer (NK) cell responses during viral infections. IRF4 deficiency impairs NK cell nutrient uptake, survival, and memory generation.
Area of Science:
- Immunology
- Cell Biology
- Virology
Background:
- Natural killer (NK) cells possess adaptive immune characteristics like memory and antigen specificity.
- NK cells share transcriptional and epigenetic programs with CD8+ T cells.
- Signal integration for optimal NK cell response during viral infections is not fully understood.
Purpose of the Study:
- To identify key regulators of NK cell response coordination during viral infections.
- To investigate the role of transcription factor IRF4 in integrating signals for NK cell function.
Main Methods:
- Utilized mouse cytomegalovirus (MCMV) infection model.
- Analyzed NK cell expansion, differentiation, and nutrient uptake in wild-type and IRF4-deficient mice.
- Investigated the impact of IRF4 deficiency on NK cell survival and memory formation.
Main Results:
- IRF4 was identified as a crucial transcription factor for integrating signals in NK cells.
- Loss of IRF4 impaired the expansion and differentiation of virus-specific NK cells.
- IRF4-deficient NK cells showed reduced nutrient uptake, affecting survival and memory generation.
Conclusions:
- IRF4 acts as a signal integrator for NK cell responses during viral infections.
- IRF4 functions as a secondary metabolic checkpoint, orchestrating NK cell adaptive responses.
- IRF4 is essential for nutrient utilization, survival, and memory development in NK cells.
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