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Related Experiment Video

Updated: Mar 1, 2026

Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE
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RIG-I: a multifunctional protein beyond a pattern recognition receptor.

Xiao-Xiao Xu1, Han Wan1, Li Nie1

  • 1Key Laboratory for Cell and Gene Engineering of Zhejiang Province, College of Life Sciences, Zhejiang University, Hangzhou, 310058, China.

Protein & Cell
|June 9, 2017
PubMed
Summary
This summary is machine-generated.

Retinoic acid inducible gene I (RIG-I) is more than an antiviral sensor. It also regulates cancer cell growth and immune responses by detecting endogenous RNAs, revealing diverse cellular roles.

Keywords:
RIG-Icancerendogenous RNAimmunityviral RNA

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Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • Retinoic acid inducible gene I (RIG-I) is a key cytosolic sensor for exogenous viral RNA, initiating innate antiviral immunity.
  • Emerging evidence indicates RIG-I also recognizes endogenous RNAs, participating in diverse cellular processes beyond pathogen detection.

Purpose of the Study:

  • To explore the multifaceted roles of RIG-I in cellular activities, including cancer progression and immune cell activation.
  • To elucidate RIG-I's dual function as both an immune sensor and a regulator of endogenous cellular pathways.

Main Methods:

  • Review of recent studies investigating RIG-I's interactions with viral and endogenous nucleic acids.
  • Analysis of RIG-I's involvement in cancer cell proliferation, therapy resistance, and immune cell activation (B cells, T cells).
  • Examination of RIG-I's tumor-suppressive roles in specific cancers like hepatocellular carcinoma and acute myeloid leukemia.

Main Results:

  • RIG-I promotes breast cancer cell expansion and therapy resistance by sensing non-coding RNAs and endogenous retroviruses.
  • RIG-I enhances T cell-independent B cell activation via interferon signaling.
  • RIG-I acts as a tumor suppressor in hepatocellular carcinoma and acute myeloid leukemia through distinct molecular mechanisms involving STAT1 and AKT-mTOR pathways.

Conclusions:

  • RIG-I's functional repertoire extends significantly beyond its canonical role as a pattern recognition receptor.
  • RIG-I plays complex and context-dependent roles in cell proliferation, differentiation, cancer biology, and immune regulation.
  • Understanding RIG-I's diverse functions offers new therapeutic avenues in oncology and immunology.