Related Experiment Video
Updated: May 23, 2026
Application of Long-term cultured Interferon-γ Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle
Published on: July 11, 2015
Stable IL-2 decision making by endogenous c-Fos amounts in peripheral memory T-helper cells
Hanna Bendfeldt1, Manuela Benary, Tobias Scheel
1Deutsches Rheuma-Forschungszentrum Berlin, A. Leibniz Institute, Berlin, Germany.
Insights
Fine-tuning interleukin-2 (IL-2) expression in human memory T-helper cells relies on transcription factors c-Fos and NFATc2. This regulation balances immune response and tolerance through controlled variability.
Area of Science:
- Immunology
- Molecular Biology
- Cellular Biology
Background:
- Interleukin-2 (IL-2) is a critical cytokine with dual roles in immune activation and peripheral tolerance.
- Precise regulation of IL-2 expression is essential for maintaining immune homeostasis.
Purpose of the Study:
- To investigate the transcription factors limiting IL-2 expression in activated human memory T-helper cells.
- To understand how variations in transcription factor levels influence IL-2 expression stability and diversity.
Main Methods:
- Single-cell and single-nucleus transcription factor analysis using flow cytometry.
- Statistical analysis of transcription factor expression levels (c-Fos, NFATc2, c-Jun, NF-κBp65).
Main Results:
- Physiological differences in c-Fos and NFATc2 expression, not c-Jun or NF-κBp65, dictate IL-2 expression decisions in memory T-helper cells.
- c-Fos expression variation accounts for IL-2 expression diversity in approximately 40% of cells.
- Consistent high c-Fos levels ensure robust IL-2 responses in the remaining memory T-helper cells.
Conclusions:
- Regulated variation in transcription factor expression allows memory T-helper cells to achieve controlled stability and variability in IL-2 cytokine production.
- This mechanism highlights how cellular populations balance robust responses with nuanced adjustments for immune control.
Abstract:
The cytokine IL-2 performs opposite functions supporting efficient immune responses and playing a key role in peripheral tolerance. Therefore, precise fine-tuning of IL-2 expression is crucial for adjusting the immune response. Combining transcription factor analysis at the single cell and the single nucleus level using flow cytometry with statistical analysis, we showed that physiological differences in the expression levels of c-Fos and NFATc2, but not of c-Jun and NF-κBp65, are limiting for the decision whether IL-2 is expressed in a strongly activated human memory T-helper (Th) cell. Variation in the expression of c-Fos leads to substantial diversity of IL-2 expression in ∼40% of the memory Th cells. The remaining cells exhibit an equally high c-Fos expression level, thereby ensuring robustness in IL-2 response within the population. These findings reveal how memory Th cells benefit from regulated variation in transcription factor expression to achieve a certain stability and variability of cytokine expression in a controlled manner.
Related Concept Videos
01:22T Cell Activation and Clonal Selection
Naive T cells that have not yet encountered an antigen express two primary CD...
01:23Cells of the Adaptive Immune Response
01:24T Cell Types and Functions
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
01:24B Cell Activation and Differentiation
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
01:01Regulation of Hematopoietic Stem Cells
01:23Immunological Memory
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...