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Antigen-specific downregulation of miR-150 in CD4 T cells promotes cell survival
Antoine Ménoret1, Federica Agliano1, Timofey A Karginov1
1Department of Immunology, UConn Health, Farmington, CT, United States.
Abstract:
MicroRNA-150 (miR-150) has been shown to play a general role in the immune system, but very little is known about its role on CD4+ T cell responses. During T cell responses against superantigen Staphylococcal Enterotoxin A, miR-150 expression was down-regulated in antigen-specific CD4+ T cells but up-regulated in CD8+ T cells. CD4+ and CD8+ T cell clonal expansion was greater in miR-150-KO mice than in WT mice, but miR-150 selectively repressed IL-2 production in CD4+ T cells. Transcriptome analysis of CD4+ T cells demonstrated that apoptosis and mTOR pathways were highly enriched in the absence of miR-150. Mechanistic studies confirmed that miR-150 promoted apoptosis specifically in antigen-specific CD4+ T cells, but not in bystander CD4+ nor in CD8+ T cells. Furthermore, inhibition of mTOR-linked mitochondrial superoxidedismutase-2 increased apoptosis in miR-150-/- antigen-specific CD4+ T. Thus, miR-150 impacts CD4+ T cell helper activity by attenuating IL-2 production along with clonal expansion, and suppresses superoxidedismutase to promote apoptosis.
Insights
MicroRNA-150 (miR-150) regulates T cell responses by suppressing IL-2 production and promoting apoptosis in CD4+ T cells. This microRNA impacts immune cell activity and expansion during immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- MicroRNA-150 (miR-150) is implicated in immune system regulation.
- Its specific role in CD4+ T cell responses remains largely uncharacterized.
Purpose of the Study:
- To investigate the function of miR-150 in CD4+ T cell responses during immune activation.
- To elucidate the molecular mechanisms underlying miR-150's effects on T cells.
Main Methods:
- Utilized a superantigen (Staphylococcal Enterotoxin A) model in wild-type (WT) and miR-150 knockout (KO) mice.
- Performed transcriptome analysis on CD4+ T cells.
- Conducted mechanistic studies to identify molecular targets and pathways.
Main Results:
- miR-150 expression was differentially regulated in CD4+ and CD8+ T cells during immune response.
- miR-150 deficiency led to increased CD4+ and CD8+ T cell clonal expansion.
- miR-150 selectively repressed IL-2 production and promoted apoptosis in antigen-specific CD4+ T cells.
- Enrichment of apoptosis and mTOR pathways was observed in miR-150-deficient CD4+ T cells.
- mTOR-linked mitochondrial superoxide dismutase-2 was identified as a target influencing apoptosis.
Conclusions:
- miR-150 plays a critical role in modulating CD4+ T cell helper activity.
- It attenuates IL-2 production and clonal expansion while promoting apoptosis in antigen-specific CD4+ T cells.
- miR-150 suppresses superoxide dismutase to induce apoptosis, thereby fine-tuning the adaptive immune response.
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