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Cellular Caspase-3 Contributes to EV-A71 2Apro-Mediated Down-Regulation of IFNAR1 at the Translation Level

  • RESEARCH ARTICLE
  • Published:
Virologica Sinica

Abstract

Enterovirus A71 (EV-A71) is the major pathogen responsible for the severe hand, foot and mouth disease worldwide, for which few effective antiviral drugs are presently available. Interferon-α (IFN-α) has been used in antiviral therapy for decades; it has been reported that EV-A71 antagonizes the antiviral activity of IFN-α based on viral 2Apro-mediated reduction of the interferon-alpha receptor 1 (IFNAR1); however, the mechanism remains unknown. Here, we showed a significant increase in IFNAR1 protein induced by IFN-α in RD cells, whereas EV-A71 infection caused obvious down-regulation of the IFNAR1 protein and blockage of IFN-α signaling. Subsequently, we observed that EV-A71 2Apro inhibited IFNAR1 translation by cleavage of the eukaryotic initiation factor 4GI (eIF4GI), without affecting IFNAR1 mRNA levels induced by IFN-α. The inhibition of IFNAR1 translation also occurred in puromycin-induced apoptotic cells when caspase-3 cleaved eIF4GI. Importantly, we verified that 2Apro could activate cellular caspase-3, which was subsequently involved in eIF4GI cleavage mediated by 2Apro. Furthermore, inhibition of caspase-3 activation resulted in the partial restoration of IFNAR1 in cells transfected with 2A or infected with EV-A71, suggesting the pivotal role of both viral 2Apro and caspase-3 activation in the disturbance of IFN-α signaling. Collectively, we elucidate a novel mechanism by which cellular caspase-3 contributes to viral 2Apro-mediated down-regulation of IFNAR1 at the translation level during EV-A71 infection, indicating that caspase-3 inhibition could be a potential complementary strategy to improve clinical anti-EV-A71 therapy with IFN-α.

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Acknowledgements

This work was partially supported by grants from Beijing Natural Science Foundation (No. 19G10290) and National Natural Science Foundation of China (No. 81772184).

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Authors and Affiliations

  1. Department of Microbiology & Infectious Disease Center, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100083, China

    Bangtao Chen, Yuya Wang, Xinyi Pei, Sanyuan Wang, Hao Zhang & Yihong Peng

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  1. Bangtao Chen
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  2. Yuya Wang
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  3. Xinyi Pei
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  4. Sanyuan Wang
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  5. Hao Zhang
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  6. Yihong Peng
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Contributions

YP and HZ designed the experiments and analyzed the data. BC, YW and SW performed most of the experiments. BC wrote the manuscript. XP, HZ and YP revised the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yihong Peng.

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The authors declare that they have no competing interests.

Animal and Human Rights Statement

This study does not involve animal experiments.

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Chen, B., Wang, Y., Pei, X. et al. Cellular Caspase-3 Contributes to EV-A71 2Apro-Mediated Down-Regulation of IFNAR1 at the Translation Level. Virol. Sin. 35, 64–72 (2020). https://doi.org/10.1007/s12250-019-00151-y

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  • DOI: https://doi.org/10.1007/s12250-019-00151-y

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