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Updated: Jan 30, 2026

Detection and Isolation of Viable Mouse IL-17-Secreting T Cells
Published on: December 18, 2008
miR-17∼92 in lymphocyte development and lymphomagenesis
Verena Labi1, Katia Schoeler1, Doron Melamed2
1Division of Developmental Immunology, Biocenter, Innsbruck Medical University, Innsbruck, 6020, Austria.
Abstract:
microRNAs (miRNAs) down-modulate the levels of proteins by sequence-specific binding to their respective target mRNAs, causing translational repression or mRNA degradation. The miR-17∼92 cluster encodes for six miRNAs whose target recognition specificities are determined by their distinct sequence. In mice, the four miRNA families generated from the miR-17∼92 cluster coordinate to allow for proper lymphocyte development and effective adaptive immune responses following infection or immunization. Lymphocyte development and homeostasis rely on tight regulation of PI3K signaling to avoid autoimmunity or immunodeficiency, and the miR-17∼92 miRNAs appear as key mediators to appropriately tune PI3K activity. On the other hand, in lymphoid tumors overexpression of the miR-17∼92 miRNAs is a common oncogenic event. In this review, we touch on what we have learned so far about the miR-17∼92 miRNAs, particularly with respect to their role in lymphocyte development, homeostasis and pathology.
Insights
MicroRNAs (miRNAs) regulate protein levels by targeting messenger RNAs. The miR-17∼92 cluster is crucial for lymphocyte development and immune responses, but its overexpression can drive lymphoid tumors.
Area of Science:
- Molecular Biology
- Immunology
- Cancer Biology
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression post-transcriptionally.
- The miR-17∼92 cluster is a key miRNA polycistron with significant roles in cellular processes.
Purpose of the Study:
- To review the multifaceted roles of the miR-17∼92 cluster miRNAs in lymphocyte development and homeostasis.
- To explore the involvement of miR-17∼92 miRNAs in immune responses and their implications in lymphoid malignancies.
Main Methods:
- This review synthesizes existing literature on miRNA function, gene regulation, and immunological pathways.
- Analysis of studies investigating the miR-17∼92 cluster in mouse models and human diseases.
Main Results:
- The miR-17∼92 cluster miRNAs are essential for proper lymphocyte development and adaptive immunity.
- Dysregulation of miR-17∼92 cluster miRNAs, particularly overexpression, is linked to oncogenesis in lymphoid tissues.
- These miRNAs fine-tune Phosphoinositide 3-kinase (PI3K) signaling, critical for lymphocyte homeostasis.
Conclusions:
- The miR-17∼92 cluster plays a dual role in immunity, promoting normal function but also contributing to cancer when overexpressed.
- Understanding miR-17∼92 miRNA regulation is vital for addressing immune disorders and lymphoid cancers.
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