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Replication of standard bovine viral diarrhea strain OregonC24Va induces endoplasmic reticulum stress–mediated apoptosis of bovine trophoblast cells

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Cell Stress and Chaperones Aims and scope

Abstract 

Bovine viral diarrhea (BVD) is a worldwide infectious disease caused by bovine viral diarrhea virus (BVDV) infection, which invades the placenta, causes abortion, produces immune tolerance and continuously infects calves, and causes huge economic losses to the cattle industry. The endoplasmic reticulum (ER) is an important organelle in cells, which is prone to ER stress after being stimulated by pathogens, thus activating the ER stress–related apoptosis. Studies have confirmed that BVDV can utilize the ER of its host to complete its own proliferation and stimulate ER stress to a certain extent. However, the role of ER stress in BVDV infecting bovine placental trophoblast cells (BTCs) and inducing apoptosis is still unclear. We are using the cytopathic strain of BVDV (OregonC24Va), which can cause apoptosis of BTCs, as a model system to determine how ER stress induced by BVDV affects placental toxicity. We show that OregonC24Va can infect BTCs and proliferate in it. With the proliferation of BVDV in BTCs, ER stress–related apoptosis is triggered. The ER stress inhibitor 4-PBA was used to inhibit the ER stress of BTCs, which not only inhibited the proliferation of BVDV, but also reduced the apoptosis of BTCs. The ER stress activator Tg can activate ER stress–related apoptosis, but the proliferation of BVDV does not change in BTCs. Therefore, BVDV utilizes the UPR of activated ER stress to promote the proliferation of BVDV in the early stage of infection, and activates the ER stress–related apoptosis of BTCs in the later stage with the virus proliferation to promote the cell apoptosis and further spread of the virus. Our research provides a new theoretical basis for exploring the placental infection and vertical transmission of BVDV.

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Data availability

All data generated or analyzed in this study are available from the corresponding author on reasonable request.

Abbreviations

ER :

Endoplasmic reticulum

BVDV :

Bovine viral diarrhea virus

BVD :

Bovine viral diarrhea

BTCs :

Bovine placental trophoblast cells

CHOP :

C/EBP homologous protein

GRP78 :

Glucose-regulated protein, 78 KDa

UPR :

Unfolded protein response

IRE-1 :

Inositol-requiring enzyme1

ATF6 :

Activating transcription factor 6

PERK :

PKR-like ER kinase

XBP1 :

X-box-binding protein

ERAD :

Endoplasmic reticulum–associated degradation

GADD153 :

Growth arrest and DNA-damage inducible gene153

JNK :

C-Jun N-terminal kinase

PI :

Persistently infected

CP :

Cytopathogenic

NCP :

Noncytopathic

Bcl-2 :

B cell lymphoma-2

ORF :

Open reading frame

IRF-3 :

Interferon regulatory factor 3

Tg :

Thapsigargin

4-PBA :

4-Phenylbutyric acid

IFN :

Interferon

MDBK :

Madin-Darby bovine kidney

CPE :

Cytopathic effect

WNV :

West Nile virus

IBV :

Infectious bronchitis virus

DEV :

Duck enteritis virus

Bax :

BCL2-associated X protein

Bak :

Bcl-2 homologous antagonist/killer

PRV :

Pseudorabies virus

MDV :

Marek’s disease virus

ZIKV :

Zika virus

DENV :

Dengue virus

eIF2α :

Eukaryotic initiation factor 2α

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (NO. 31802263, 31802258) and the Zhejiang Provincial Natural Science Foundation (NO. LY22C18000).

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Authors

Contributions

NHY, QJS, and XGW performed the experiments and collected and interpreted the data. XHS, XLQ, and KX provided initial help with the analysis. ZHZ, ZW, and YJ collected the samples. XGW and NHY conceptualized and wrote the manuscript. LFX reviewed the manuscript prior to publication.

Corresponding authors

Correspondence to Longfei Xiao or Xiangguo Wang.

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All experimental and surgical procedures involving animals were approved by the Beijing Laboratory Animal Management Committee.

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The authors declare no competing interests.

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Yuan, N., Song, Q., Jin, Y. et al. Replication of standard bovine viral diarrhea strain OregonC24Va induces endoplasmic reticulum stress–mediated apoptosis of bovine trophoblast cells. Cell Stress and Chaperones 28, 49–60 (2023). https://doi.org/10.1007/s12192-022-01300-1

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  • DOI: https://doi.org/10.1007/s12192-022-01300-1

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