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. 2021 Jun 14;52:86. doi: 10.1186/s13567-021-00955-5

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Role of p38 in inhibiting PDCoV replication and alleviating PDCoV-induced apoptosis by EP in LLC-PK1 cells. A The efficiency of p38 siRNA was evaluated by Western blot. LLC-PK1 cells were transfected with the indicated siRNA. At 24 h post-transfection, the expression of p38 was analyzed by Western blot. Results were presented as the ratio of p38 band intensity to β-actin band intensity. B LLC-PK1 cells grown in 6-well plates were transfected with p38 siRNA #1 or NC siRNA for 24 h, and then infected with 2 MOI PDCoV or mock-infected in the absence or presence EP (150 μM). After PDCoV adsorption for 1 h, the cells were further cultured in fresh medium in the absence or presence EP (150 μM). Western blot analysis of proteins from indicated LLC-PK1 cells probed with the anti-p-p38, anti-p38, anti-cleaved caspase-3, anti-caspase-3, anti-Bax, anti-Bcl-2 and anti-PDCoV N antibody. C–I Results are presented as the ratio of target protein band intensity to β-actin band intensity. Data are presented as the mean ± SEM. *P < 0.05; **P < 0.01; ***P < 0.001.