ArticleViruses2026
Krüppel-like Factor 4 and Glucocorticoid Receptor Cooperatively Transactivate the Bovine Alphaherpesvirus 1 (BoHV-1) Infected Cell Protein 0 (bICP0) Early Promoter.
Article in Viruses, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Bovine alphaherpesvirus 1 (BoHV-1) acute infection induces respiratory tract disorders and conjunctivitis and suppresses immune responses that may cause bacterial pneumonia. BoHV-1 infection establishes lifelong latency in sensory neurons in trigeminal ganglia (TG), the central nervous system, and certain cells in the pharyngeal tonsil. BoHV-1 is a chronic problem in the cattle industry because stress, including the synthetic corticosteroid dexamethasone, triggers reactivation from latency after an intravenous injection. The BoHV-1 immediate early transcription unit 1 (IEtu1) promoter drives expression of infected cell protein 0 (bICP0) and bICP4, two viral transcriptional regulators. Stress activates the glucocorticoid receptor (GR), and Krüppel-like factor 15 (KLF15) cooperatively transactivates the BoHV-1 IEtu1 promoter if both GR response elements (GREs) are intact. Since the bICP0 gene contains a separate early (E) promoter, we tested the hypothesis that GR+KLF family members transactivate the bICP0 E-promoter. GR+KLF4, both pioneer transcription factors, cooperatively stimulate bICP0 E-promoter activity in mouse neuroblastoma cells (Neuro-2A), and stimulate productive infection. Notably, the bICP0 E-promoter lacks GREs, suggesting that a novel mechanism triggers transactivation. CA motifs and C-rich Sp1 binding sites in bICP0 E-promoter sequences are crucial for transactivation and binding to GR and KLF4.
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