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http://dx.doi.org/10.5352/JLS.2020.30.3.285

FMDV 2C Protein of Foot-and-mouth Disease Virus Increases Expression of Pro-inflammatory Cytokine TNFα via Endoplasmic Reticulum Stress  

Kang, Hyo Rin (Department of Molecular Biology, Pusan National University)
Seong, Mi So (Department of Molecular Biology, Pusan National University)
Nah, Jin Ju (Foot-and-Mouth Disease Research Division, Animal and Plant Quarantine Agency)
Ryoo, Soyoon (Foot-and-Mouth Disease Research Division, Animal and Plant Quarantine Agency)
Ku, Bok Kyung (Foot-and-Mouth Disease Research Division, Animal and Plant Quarantine Agency)
Cheong, JaeHun (Department of Molecular Biology, Pusan National University)
Publication Information
Journal of Life Science / v.30, no.3, 2020 , pp. 285-290 More about this Journal
Abstract
Foot-and-mouth disease virus (FMDV), a member of the genus Aphthovirus in the Picornaviridae family, affects wild and domesticated ruminants and pigs. FMDV causes various clinical symptoms, including severe inflammation in infected tissue. Genome RNA of FMDV shows a positive single-strand chain approximately 8.3 kb long and encodes a single long open reading frame (ORF). The ORF is translated into structural and non-structural proteins by viral proteases. The FMDV 2C protein is one of the non-structural proteins encoded by FMDV and plays a critical role in FMD pathogenesis, including inflammation, apoptosis, and viral replication. In this study, we examined whether FMDV 2C induces intracellular expression of pro-inflammatory cytokine tumor necrosis factor alpha (TNFα). FMDV 2C expression in pig IBRS-2 cells increased mRNA and protein expression of TNFα at the transcriptional level via activation of TNFα promoter. Treatment with 4-phenylbutyric acid, an endoplasmic reticulum (ER) stress reducer, decreased TNFα expression induced by FMDV 2C. Activating transcription factor 4 (ATF4), a transcription factor mediating ER stress response, induced transactivation of TNFα promoter and expression of mRNA and protein of TNFα. However, the dominant negative mutant of ATF4 did not induce FMDV 2C-mediated TNFα expression. The results indicate that FMDV 2C protein increases clinical inflammation via ATF4-mediated TNFα expression and is associated with ER stress induction.
Keywords
ATF4; ER stress; FMDV; inflammation; $TNF{\alpha}$;
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