Extracellular vesicle microRNA (EV-miRNA)

Extracellular vesicle microRNAs (EV-miRNAs) are small, non-coding RNA molecules encapsulated within vesicles such as exosomes and microvesicles, serving as critical mediators of intercellular communication. In the immune system, these molecules are secreted by various cells—including dendritic cells, T cells, and macrophages—to modulate the functional state of recipient cells by regulating multiple immune pathways such as T-cell activation, cytokine signaling, and antigen presentation (Alexander et al., 2015, Nature Communications). Their role is particularly prominent in the tumor microenvironment, where cancer cells release EV-miRNAs to suppress immune surveillance and promote an immunosuppressive landscape (Zhou et al., 2018, Journal of Hematology & Oncology). From a therapeutic perspective, EV-miRNAs are being investigated both as diagnostic biomarkers and as targets for drug development. Strategies include the use of miRNA mimics to restore tumor-suppressive functions or antagomirs (antisense oligonucleotides) to inhibit pathogenic miRNAs that drive inflammation or immune evasion (Ying et al., 2017, Cell). While promising, the clinical application of targeting these pathways faces significant hurdles, including the pleiotropic nature of miRNAs—where a single molecule can regulate hundreds of different genes—and the technical challenges of delivering RNA-based therapeutics specifically to the desired tissue without inducing systemic off-target effects or adverse immune reactions.

Other names

Exosomal microRNAExosomal miRNAEV-derived miRNACirculating microRNAVesicle-encapsulated miRNA

Extracellular vesicle microRNAs function by being internalized by recipient cells, where they enter the RNA-induced silencing complex (RISC) to bind complementary sequences on target mRNAs, leading to translational repression or mRNA degradation and subsequent modulation of multiple downstream signaling pathways.