Equine herpesvirus-1 (EHV-1) is a major respiratory viral pathogen of horses, causing upper respiratory tract disease, abortion, neonatal death, and neurological disease that may lead to paralysis and death. EHV-1 replicates initially in the respiratory epithelium and then spreads systemically to endothelial cells lining the small blood vessels in the uterus and spinal cord leading to abortion and EHM in horses. Like other herpesviruses, EHV-1 employs a variety of mechanisms for immune evasion including suppression of type-I interferon (IFN) production in equine endothelial cells (EECs). Previously we have shown that the neuropathogenic T953 strain of EHV-1 inhibits type-I IFN production in EECs and this is mediated by a viral late gene product. But the mechanism of inhibition was not known. Here we show that T953 strain infection of EECs induced degradation of endogenous IRF-3 protein. This in turn interfered with the activation of IRF-3 signaling pathways. EHV-1 infection caused the activation of the NF-κB signaling pathways, suggesting that inhibition of type-I IFN production is probably due to interference in IRF-3 and not NF-κB signal transduction.
|Number of pages||9|
|Journal||Veterinary Immunology and Immunopathology|
|State||Published - May 1 2016|
Bibliographical noteFunding Information:
We wish to acknowledge the generous technical assistance of Ms. Stephanie Reedy. We thank Dr. Adolfo Garcia-Sastre (Mount Sinai School of Medicine, New York), Dr. Dennis O’Callaghan (Louisiana State University) for provision of reagents and Dr. Klaus Osterrieder (Institut für Virologie) for his helpful discussion. This work was supported by grants from the American Quarter Horse Foundation and the Grayson Jockey Club Research Foundation . Sanjay Sarkar was supported by a fellowship from the Geoffrey C. Hughes Foundation . The work is part of a project of the Kentucky Agricultural Experiment Station (KY014041 and KY041042) and is published with the approval of the Director (publication no. 16-14-028).
© 2016 Elsevier B.V.
Copyright 2017 Elsevier B.V., All rights reserved.
- Equine herpesvirus-1
- Immune evasion
- Innate immunity
ASJC Scopus subject areas
- Veterinary (all)