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Latently infected calves consistently reactivate from latency following a single intravenous injection of the synthetic corticosteroid dexamethasone. The immediate early transcription unit 1 (IEtu1) promoter, which drives bovine ICP0 (bICP0) and bICP4 expression, is stimulated by dexamethasone because it contains two glucocorticoid receptor (GR) response elements (GREs). Several Kr\u00fcppel-like transcription factors (KLF), including KLF15, are induced during reactivation from latency, and they stimulate certain viral promoters and productive infection. In this study, we demonstrate that the GR and KLF15 were frequently expressed in the same trigeminal ganglion (TG) neuron during reactivation and cooperatively stimulated productive infection and IEtu1 GREs in mouse neuroblastoma cells (Neuro-2A). We further hypothesized that additional regions in the BoHV-1 genome are transactivated by the GR or stress-induced transcription factors. To test this hypothesis, BoHV-1 DNA fragments (less than 400 bp) containing potential GR and KLF binding sites were identified and examined for transcriptional activation by stress-induced transcription factors. Intergenic regions within the unique long 52 gene (UL52; a component of the DNA primase\/helicase complex), bICP4, IEtu2, and the unique short region were stimulated by KLF15 and the GR. Chromatin immunoprecipitation studies revealed that the GR and KLF15 interacted with sequences within IEtu1 GREs and the UL52 fragment. Coimmunoprecipitation studies demonstrated that KLF15 and the GR were associated with each other in transfected cells. Since the GR stimulates KLF15 expression, we suggest that these two transcription factors form a feed-forward loop that stimulates viral gene expression and productive infection following stressful stimuli.<\/jats:p><jats:p><jats:bold>IMPORTANCE<\/jats:bold>Bovine herpesvirus 1 (BoHV-1) is an important viral pathogen that causes respiratory disease and suppresses immune responses in cattle; consequently, life-threatening bacterial pneumonia can occur. Following acute infection, BoHV-1 establishes lifelong latency in sensory neurons. Reactivation from latency is initiated by the synthetic corticosteroid dexamethasone. Dexamethasone stimulates lytic cycle viral gene expression in sensory neurons of calves latently infected with BoHV-1, culminating in virus shedding and transmission. Two stress-induced cellular transcription factors, Kr\u00fcppel-like transcription factor 15 (KLF15) and the glucocorticoid receptor (GR), cooperate to stimulate productive infection and viral transcription. Additional studies demonstrated that KLF15 and the GR form a stable complex and that these stress-induced transcription factors bind to viral DNA sequences, which correlates with transcriptional activation. The ability of the GR and KLF15 to synergistically stimulate viral gene expression and productive infection may be critical for the ability of BoHV-1 to reactivate from latency following stressful stimuli.<\/jats:p>","DOI":"10.1128\/jvi.00904-17","type":"journal-article","created":{"date-parts":[[2017,8,10]],"date-time":"2017-08-10T00:50:35Z","timestamp":1502326235000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":44,"title":["Combinatorial Effects of the Glucocorticoid Receptor and Kr\u00fcppel-Like Transcription Factor 15 on Bovine Herpesvirus 1 Transcription and Productive Infection"],"prefix":"10.1128","volume":"91","author":[{"given":"Fouad S.","family":"El-mayet","sequence":"first","affiliation":[{"name":"Oklahoma State University, Center for Veterinary Health Sciences, Department of Veterinary Pathobiology, Stillwater, Oklahoma, USA"},{"name":"Benha University, Faculty of Veterinary Medicine, Department of Virology, Kaliobyia, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laximan","family":"Sawant","sequence":"additional","affiliation":[{"name":"Oklahoma State University, Center for Veterinary Health Sciences, Department of Veterinary Pathobiology, Stillwater, Oklahoma, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prasanth","family":"Thunuguntla","sequence":"additional","affiliation":[{"name":"Oklahoma State University, Center for Veterinary Health Sciences, Department of Veterinary Pathobiology, Stillwater, Oklahoma, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clinton","family":"Jones","sequence":"additional","affiliation":[{"name":"Oklahoma State University, Center for Veterinary Health Sciences, Department of Veterinary Pathobiology, Stillwater, Oklahoma, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/cfg.474"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.cvfa.2010.04.007"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.3390\/v1020255"},{"key":"e_1_3_2_5_2","volume-title":"University of Arkansas, Division of Agriculture Research and Extension, document FSA3082","author":"Powell J","year":"2005","unstructured":"Powell J . 2005. 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