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A Chromatin Immunoprecipitation Assay to Identify Novel NFAT2 Target Genes in Chronic Lymphocytic Leukemia
Published on: December 4, 2018
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Prox1 represses IL-2 gene expression by interacting with NFAT2
Shujie Zhang1,2, Ning Yu3, Linfang Wang2
1Eye Institute, Eye and ENT Hospital, Shanghai Medical College, Fudan University, Shanghai 200031, China.
Oncotarget
|October 21, 2017
Summary
Prospero-related homeobox 1 (Prox1) negatively regulates Interleukin-2 (IL-2) gene expression in T cells. Prox1 binds to NFAT2, inhibiting IL-2 production upon T cell activation.
Area of Science:
- Immunology
- Molecular Biology
- Transcription Factor Regulation
Background:
- Interleukin-2 (IL-2) is crucial for T lymphocyte activation.
- Prospero-related homeobox 1 (Prox1) is a transcription factor with varied roles.
- Previous studies indicated Prox1 expression in T cells.
Purpose of the Study:
- To investigate the role of Prox1 in T cell activation and IL-2 production.
- To elucidate the mechanism by which Prox1 affects IL-2 gene expression.
Main Methods:
- Studied Prox1 expression in CD4+ T cells after T cell receptor (TCR) activation.
- Manipulated Prox1 levels using overexpression and small interfering RNA (siRNA) knockdown.
- Analyzed IL-2 promoter activity and Prox1-NFAT2 interaction via physical binding assays.
Main Results:
- TCR activation downregulated Prox1 expression in CD4+ T cells.
- Prox1 overexpression attenuated IL-2 production; Prox1 knockdown increased IL-2 expression.
- Prox1 inhibited IL-2 promoter activity by binding to the minimal IL-2 promoter.
- Prox1 repressed NFAT2-dependent IL-2 transactivation through physical interaction with NFAT2, with the N-terminal region being critical.
Conclusions:
- Prox1 acts as a negative regulator of IL-2 gene expression.
- Prox1 directly interacts with NFAT2 to control IL-2 production.
- Findings reveal a novel regulatory mechanism for IL-2 in T cell activation.
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