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Published on: October 4, 2018
CyHV-2 ORF104 activates the p38 MAPK pathway
Mi Du1, Mingliang Chen2, Haifeng Shen2
1School of Marine Sciences, Ningbo University, Ningbo, 315211 Zhejiang, China; State Key Laboratory Breeding Base of Marine Genetic Resources, South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005 Fujian, China.
Cyprinid herpesvirus 2 (CyHV-2) ORF104 protein activates the p38 signaling pathway, crucial for viral infection. Inhibiting p38 reduces fish mortality, identifying ORF104 as a potential vaccine target.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Cyprinid herpesvirus 2 (CyHV-2) causes significant aquaculture losses.
- Limited knowledge exists on specific CyHV-2 genes' roles during infection.
- ORF104, a conserved kinase-like protein in CyHV-2, warrants functional investigation.
Purpose of the Study:
- To elucidate the function of the CyHV-2 ORF104 gene during viral infection.
- To investigate ORF104's role in host cell signaling pathways.
- To assess ORF104 as a potential vaccine candidate.
Main Methods:
- Subcellular localization of ORF104 in HEK293T and EPC cells.
- Analysis of ORF104's effect on MAPK signaling pathways (p38, JNK, ERK) via overexpression.
- In vivo studies using gibel carp (Carassius auratus gibelio) and a p38 inhibitor (SB203580).
Main Results:
- ORF104 localizes to the nucleus, dependent on its nuclear localization signal.
- ORF104 overexpression activates the p38 MAPK pathway, but not JNK or ERK.
- CyHV-2 infection increases p38 phosphorylation in gibel carp.
- p38 inhibition significantly reduces CyHV-2-induced fish mortality.
Conclusions:
- ORF104 plays a critical role in CyHV-2 pathogenesis by activating the p38 signaling pathway.
- The p38 pathway is essential for CyHV-2 survival and virulence.
- ORF104 is identified as a promising vaccine candidate against CyHV-2.
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