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Human Cytomegalovirus miR-UL112-3p Targets TLR2 and Modulates the TLR2/IRAK1/NFκB Signaling Pathway


Human cytomegalovirus (HCMV) is a herpesvirus that is a leading cause of congenital defects in newborns and can be deadly in people with weakened immunity. HCMV has developed multiple strategies to escape the host immune system. Among those, microRNAs (miRNAs) are short regulatory RNAs that target gene transcripts through sequence complementarity. HCMV expresses more than 20 miRNAs and several of them, in particular miR-UL112-3p, have been demonstrated to cooperate in evading the host antiviral immune response during infection. In this work we identified TLR2, a cell surface receptor that plays an important role in the detection and control of CMV infection, as a novel target of miR-UL112-3p. We demonstrate that miR-UL112-3p efficiently down-regulates endogenous TLR2 during infection, causing significant inhibition of the downstream signaling cascade. This work provides the first identified mechanism of TLR2 modulation by HCMV and is the first report of TLR2 targeting by a viral miRNA.


Vyšlo v časopise: Human Cytomegalovirus miR-UL112-3p Targets TLR2 and Modulates the TLR2/IRAK1/NFκB Signaling Pathway. PLoS Pathog 11(5): e32767. doi:10.1371/journal.ppat.1004881
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1004881

Souhrn

Human cytomegalovirus (HCMV) is a herpesvirus that is a leading cause of congenital defects in newborns and can be deadly in people with weakened immunity. HCMV has developed multiple strategies to escape the host immune system. Among those, microRNAs (miRNAs) are short regulatory RNAs that target gene transcripts through sequence complementarity. HCMV expresses more than 20 miRNAs and several of them, in particular miR-UL112-3p, have been demonstrated to cooperate in evading the host antiviral immune response during infection. In this work we identified TLR2, a cell surface receptor that plays an important role in the detection and control of CMV infection, as a novel target of miR-UL112-3p. We demonstrate that miR-UL112-3p efficiently down-regulates endogenous TLR2 during infection, causing significant inhibition of the downstream signaling cascade. This work provides the first identified mechanism of TLR2 modulation by HCMV and is the first report of TLR2 targeting by a viral miRNA.


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