Virology: Bovine viral diarrhea virus 2 infection activates the unfolded protein response in MDBK cells, leading to apoptosis

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  • MAEDA Kouji
    Department of Veterinary Microbiology, Faculty of Agriculture, Iwate University
  • FUJIHARA Masatoshi
    Department of Veterinary Microbiology, Faculty of Agriculture, Iwate University
  • HARASAWA Ryô
    Department of Veterinary Microbiology, Faculty of Agriculture, Iwate University

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  • Bovine viral diarrhea virus 2 Infection Activates the Unfolded Protein Response in MDBK Cells, Leading to Apoptosis

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Bovine viral diarrhea virus 2 (BVDV-2) strains are divided into cytopathic and non-cytopathic biotypes based on the ablity to induce cytopathic effects in cultured cells. The mechanism of cytopathogenicity of BVDV-2 is not well understood. We examined cytopathogenesis in MDBK cells resulting from BVDV-2 infections by microscopic examinations and microarray analysis. We found that BVDV-2 activates endoplasmic reticulum (ER) stress signaling pathways that contribute to apoptosis of infected cells. We also monitored the expression of ER stress marker gene by RT-PCR during BVDV-2 infection and demonstrated that infection of MDBK cells with a cytopathic strain of BVDV-2 induces glucose-regulated protein 78 expression. Infection with BVDV-2 also induces DNA-damage-inducible transcript 3 expression and downregulates the lectin-galactoside-binding soluble 1 level. These results show that cytopathic strains of BVDV-2 induce an ER stress response resulting in apoptosis.<br>

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