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Fish Shellfish Immunol. 2019 Sep 12;94:381-388. doi: 10.1016/j.fsi.2019.09.026. [Epub ahead of print]

Generation of microRNA-30e-producing recombinant viral hemorrhagic septicemia virus (VHSV) and its effect on in vitro immune responses.

Author information

1
Department of Aquatic Life Medicine, Pukyong National University, Busan, 48513, South Korea.
2
Department of Integrative Bio-industrial Engineering, Sejong University, Seoul, 05006, South Korea.
3
Department of Aquatic Life Medicine, Pukyong National University, Busan, 48513, South Korea. Electronic address: khkim@pknu.ac.kr.

Abstract

MicroRNAs (miRNAs) are non-coding small RNAs involved in the regulation of gene expression. In the present study, we firstly reported the use of a fish RNA virus, viral hemorrhagic septicemia virus (VHSV), as a delivery vehicle of a miRNA-30e, and the effect of miR-30e produced by the recombinant VHSV on the immune responses of Epithelioma papulosum cyprini (EPC) cells was investigated. The expression of functional miR-30e using a CMV promoter-driven vector was verified by the significantly lower eGFP expression in cells transfected with a vector containing miR-30e sponge sequence than that in cells transfected with a control vector that had mutated miR-30e sponge sequence. Furthermore, the down-regulation of reporter gene containing 3'-UTR of NF-κb inhibitor α-like protein B (NFκbiαb) by miR-30e was demonstrated, suggesting that miR-30e overexpression can increase immune responses related to NF-κB activation through inhibition of IκB. A miR-30e-expressing recombinant VHSV (rVHSV-A-miR30e) that had primary microRNA-30e sequence between N and P genes was rescued using the reverse genetic method, and the successful expression of miR-30e in the cells infected with rVHSV-A-miR30e was demonstrated using Northern blot and qRT-PCR. Cells infected with rVHSV-A-miR30e showed the increase of NF-κB activation and type I interferon induced genes expression, suggesting that rVHSV-A-miR30e can produce functional miR-30e in fish cells, and VHSV can be used as a vehicle to deliver functional microRNAs in fish.

KEYWORDS:

Delivery vehicle; NF-κB; Recombinant VHSV; Type I interferon; miR-30e

PMID:
31521783
DOI:
10.1016/j.fsi.2019.09.026

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