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CRISPR/Cas9-mediated knockout of HIF-1α gene in epithelioma papulosum cyprini (EPC) cells inhibited apoptosis and viral hemorrhagic septicemia virus (VHSV) growth

  • Min Sun Kim
  • Ki Hong Kim
Brief Report

Abstract

Hypoxia-inducible factor-1 (HIF-1) is a heterodimer of HIF-1α and HIF-1β, and its key role in the regulation of cellular responses to hypoxia has been well-demonstrated. The participation of HIF-1α in apoptosis has been reported in mammals, however, a little information is available on the role of HIF-1α in the progression of apoptosis in fish. In this study, to know the role of HIF-1α in the apoptosis of fish cells, we produced HIF-1α knockout Epithelioma papulosum cyprini (EPC) cells using a CRISPR/Cas9 vector, and a single cell clone showing a heterozygous insertion/deletion (indel) mutation (one nucleotide insertion and one nucleotide deletion in HIF-1α gene) was chosen for further experiments. To confirm the knockout of HIF-1α, cells were transfected with a hypoxia reporting vector containing hypoxic response elements (HREs). EPC cells transfected with the reporting plasmids showed significantly increased luminescence by exposure to cobalt chloride, a prolyl hydroxylases inhibitor. On the other hand, HIF-1α knockout EPC cells showed a non-responsiveness to a cobalt chloride exposure, suggesting that functional HIF-1α protein was not produced in the HIF-1α knockout EPC cells. Apoptosis progression induced by camptothecin and viral hemorrhagic septicemia virus (VHSV) infection was severely inhibited by HIF-1α knockout, and the replication of VHSV was significantly retarded in HIF-1α knockout EPC cells. These results suggest that HIF-1α in EPC cells acts as a pro-apoptotic factor in the progression of apoptosis triggered by a DNA damaging agent and rhabdoviral infection.

Notes

Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Science, ICT and Future Planning of South Korea (NRF-2017R1C1B2003726).

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

Research involving human participants and/or animals

No part of this study was performed with human participants or animals by any of the authors.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate School of Integrated BioindustrySejong UniversitySeoulSouth Korea
  2. 2.Department of Aquatic Life MedicinePukyong National UniversityBusanSouth Korea

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