Toll-like receptor expression in the nervous system of bovine alpha-herpesvirus-infected calves

• DOI: 10.1016/j.rvsc.2014.06.014
• Publication Date: 2014-07-05T08:16:31Z
• Authors: M.S. Marin; S. Quintana; M.R. Leunda; A.C. Odeón; S.E. Pérez
• Keywords: 0301 basic medicine; Expression Patterns; Cattle Diseases; Nervous System; 0403 veterinary science; 03 medical and health sciences; Meningoencephalitis; https://purl.org/becyt/ford/4.3; Animals; https://purl.org/becyt/ford/4; Encephalitis, Viral; 14. Life underwater; Administration, Intranasal; Cerebral Cortex; Herpesvirus 5, Bovine; Toll-Like Receptors; Herpesviridae Infections; 04 agricultural and veterinary sciences; Toll-Like Receptor 3; 3. Good health; Bovine Herpesviruses; Toll-Like Receptor 7; Trigeminal Ganglion; Toll-Like Receptor 8; Toll-Like Receptor 9; DNA, Viral; Encephalitis; Cattle; Signal Transduction

In this study, the expression levels of viral Toll-like receptors (TLRs) in the nervous system of bovine herpesvirus type 5 (BoHV-5)-infected calves were investigated. A significant increase in the expression of TLRs 3 and 7-9 was found in the anterior cerebral cortex during acute infection and viral reactivation. In the trigeminal ganglia, only TLR9 expression was significantly affected. The magnitude of the increase was lower in BoHV-1-infected calves, suggesting that a restricted immune response might protect against exacerbated inflammatory responses in the brain. This work describes, for the first time, the involvement of TLRs 3 and 7-9 in the recognition of BoHV in the bovine nervous system, indicating that the expression of these receptors might be associated with the development of neurological disease. Modulation of the signalling pathways mediated by TLRs might provide an effective approach to control the neuro-immune response to BoHV-5, which may be responsible for neurological lesions.