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Published on: July 29, 2014
MicroRNAs in the regulation of TLR and RIG-I pathways
1Department of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai, China. iyingke@hotmail.com
Abstract:
The innate immune system recognizes invading pathogens through germline-encoded pattern recognition receptors (PRRs), which elicit innate antimicrobial and inflammatory responses and initiate adaptive immunity to control or eliminate infection. Toll-like receptors (TLRs) and retinoic acid-inducible gene I (RIG-I) are the key innate immune PRRs and are tightly regulated by elaborate mechanisms to ensure a beneficial outcome in response to foreign invaders. Although much of the focus in the literature has been on the study of protein regulators of inflammation, microRNAs (miRNAs) have emerged as important controllers of certain features of the inflammatory process. Several miRNAs are induced by TLR and RIG-I activation in myeloid cells and act as feedback regulators of TLR and RIG-I signaling. In this review, we comprehensively discuss the recent understanding of how miRNA networks respond to TLR and RIG-I signaling and their role in the initiation and termination of inflammatory responses. Increasing evidence also indicates that both virus-encoded miRNAs and cellular miRNAs have important functions in viral replication and host anti-viral immunity.
Insights
MicroRNAs (miRNAs) are key regulators of inflammation, controlling Toll-like receptor (TLR) and RIG-I signaling. This review details how miRNA networks manage inflammatory responses during infection and viral immunity.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- The innate immune system uses pattern recognition receptors (PRRs) like Toll-like receptors (TLRs) and retinoic acid-inducible gene I (RIG-I) to detect pathogens.
- While protein regulators of inflammation are well-studied, microRNAs (miRNAs) are increasingly recognized as crucial controllers of inflammatory processes.
Purpose of the Study:
- To comprehensively review the role of miRNA networks in regulating TLR and RIG-I signaling pathways.
- To discuss the involvement of miRNAs in initiating and terminating inflammatory responses to pathogens and viruses.
Main Methods:
- Literature review of recent research on miRNA regulation of innate immunity.
- Analysis of studies investigating miRNA involvement in TLR and RIG-I signaling.
- Synthesis of evidence on the function of cellular and viral miRNAs in antiviral immunity.
Main Results:
- miRNAs are induced by TLR and RIG-I activation in myeloid cells, acting as feedback regulators.
- miRNA networks dynamically control the initiation and resolution of inflammatory responses.
- Both host and viral miRNAs significantly impact viral replication and host antiviral defense.
Conclusions:
- miRNAs are critical components of the innate immune system, modulating inflammatory signaling pathways.
- Understanding miRNA networks offers insights into host-pathogen interactions and antiviral strategies.
- miRNAs play multifaceted roles in both promoting and restricting viral infections.
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