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Interferon regulatory factor 4 (IRF4) interacts with NFATc2 to modulate interleukin 4 gene expression
Jyothi Rengarajan1, Kerri A Mowen, Kathryn D McBride
1Department of Immunology and Infectious Disease, Harvard School of Public Health, Boston, MA 02115, USA.
The Journal of Experimental Medicine
|April 17, 2002
Summary
Interferon regulatory factor 4 (IRF4) enhances T cell activation by partnering with nuclear factor of activated T cells c2 (NFATc2) to boost interleukin-4 (IL-4) gene expression, crucial for immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Gene Regulation
Background:
- Nuclear factor of activated T cells (NFAT) proteins are key transcription factors in lymphocyte activation.
- NFATs regulate inducible IL-4 gene expression, vital for immune responses.
- Interferon regulatory factor 4 (IRF4) is essential for lymphocyte activation, but its specific roles in T cells are unclear.
Purpose of the Study:
- To elucidate the molecular functions of IRF4 in T cell lineage.
- To investigate the interaction between IRF4 and NFATc2 in regulating IL-4 gene expression.
Main Methods:
- Investigated the synergistic effects of IRF4 and NFATc2 on IL-4 promoter activity.
- Assessed the physical interaction between IRF4 and NFATc2.
- Analyzed IL-4 production in T helper cells from IRF4-deficient mice.
Main Results:
- IRF4 synergizes with NFATc2 to enhance IL-4 promoter activity.
- Physical interaction between IRF4 and NFATc2 is essential for this synergy.
- IRF4, NFATc2, and c-maf cooperatively increase IL-4 production.
- Naïve T helper cells lacking IRF4 show severely reduced IL-4 and Th2 cytokine production.
Conclusions:
- IRF4 acts as a crucial partner for NFATc2 in regulating IL-4 gene expression.
- This interaction defines a key molecular function for IRF4 in T helper cell differentiation.
- IRF4 plays a significant role in Th2 cytokine production.