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TLR3 controls constitutive IFN-β antiviral immunity in human fibroblasts and cortical neurons

Daxing Gao 1, 2, * Michael Ciancanelli 1, 3 Peng Zhang 1 Oliver Harschnitz 4 Vincent Bondet 5 Mary Hasek 1 Jie Chen 1 Xin Mu 6 Yuval Itan 7 Aurélie Cobat 8 Vanessa Sancho-Shimizu 8, 9 Benedetta Bigio 1 Lazaro Lorenzo 8 Gabriele Ciceri 4 Jessica Mcalpine 4 Esperanza Anguiano 10 Emmanuelle Jouanguy 1, 8 Damien Chaussabel 10, 11, 12 Isabelle Meyts 13, 14, 7 Michael Diamond 15 Laurent Abel 1, 8 Sun Hur 6 Gregory Smith 16 Luigi Notarangelo 17 Darragh Duffy 5 Lorenz Studer 4 Jean-Laurent Casanova 1, 8, 18, 19 Shen-Ying Zhang 1, 8, *
Abstract : Human herpes simplex virus 1 (HSV-1) encephalitis can be caused by inborn errors of the TLR3 pathway, resulting in impairment of CNS cell-intrinsic antiviral immunity. Deficiencies of the TLR3 pathway impair cell-intrinsic immunity to vesicular stomatitis virus (VSV) and HSV-1 in fibroblasts, and to HSV-1 in cortical but not trigeminal neurons. The underlying molecular mechanism is thought to involve impaired IFN-α/β induction by the TLR3 recognition of dsRNA viral intermediates or by-products. However, we show here that human TLR3 controls constitutive levels of IFNB mRNA and secreted bioactive IFN-β protein, and thereby also controls constitutive mRNA levels for IFN-stimulated genes (ISGs) in fibroblasts. Tlr3-/- mouse embryonic fibroblasts also have lower basal ISG levels. Moreover, human TLR3 controls basal levels of IFN-β secretion and ISG mRNA in induced pluripotent stem cell-derived cortical neurons. Consistently, TLR3-deficient human fibroblasts and cortical neurons are vulnerable not only to both VSV and HSV-1, but also to several other families of viruses. The mechanism by which TLR3 restricts viral growth in human fibroblasts and cortical neurons in vitro and, by inference, by which the human CNS prevents infection by HSV-1 in vivo, is therefore based on the control of early viral infection by basal IFN-β immunity.
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Contributor : Marie-Christine Vougny <>
Submitted on : Wednesday, May 26, 2021 - 10:52:03 AM
Last modification on : Monday, June 14, 2021 - 4:24:03 PM

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Daxing Gao, Michael Ciancanelli, Peng Zhang, Oliver Harschnitz, Vincent Bondet, et al.. TLR3 controls constitutive IFN-β antiviral immunity in human fibroblasts and cortical neurons. Journal of Clinical Investigation, American Society for Clinical Investigation, 2021, 131 (1), pp.e134529. ⟨10.1172/JCI134529⟩. ⟨pasteur-03236241⟩



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