Innate immune response of rainbow trout erythrocytes to spinycterins expressing a downsized viral fragment of viral haemorrhagic septicaemia virus

Recent studies have reported on the importance of RBCs in fish responses to viral infections and DNA vaccines. Surface-displaying recombinant bacterins (spinycterins) are a safe and adaptable prototype for viral vaccination of fish and represent an alternative method of aquaculture prophylaxis, sinc...

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Bibliographic Details
Published in:Aquaculture 2023-04, Vol.568, p.739303-739303, Article 739303
Main Authors: Puente-Marin, S., Cazorla, D., Chico, V., Coll, J., Ortega-Villaizan, M.
Format: Article
Language:English
Subjects:
Anchor
bacteria
Bacterin
Erythrocytes
Fish
immune response
Red blood cells
Spinycterin
Surface display
Vaccine
VHSV
Virus
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Summary:Recent studies have reported on the importance of RBCs in fish responses to viral infections and DNA vaccines. Surface-displaying recombinant bacterins (spinycterins) are a safe and adaptable prototype for viral vaccination of fish and represent an alternative method of aquaculture prophylaxis, since have been reported to enhance fish immune response. We evaluated the innate immune response of rainbow trout (Oncorhynchus mykiss) red blood cells (RBCs), head kidney, and spleen to spinycterins expressing a fragment of the glycoprotein G of viral haemorrhagic septicemia virus (VHSV), one of the most devastating world-wide diseases in farmed salmonids. We first selected an immunorelevant downsized viral fragment of VHSV glycoprotein G (frg16252–450). Then, spinycterins expressing frg16252–450 fused to Nmistic anchor-motif (Nmistic+frg16252–450) were compared to spinycterins expressing frg16252–450 internally without the anchor motif. Nmistic+frg16252–450 spinycterins showed increased attachment to RBCs in vitro and modulated the expression of interferon- and antigen presentation–related genes in RBCs in vitro and in vivo, after intravenous injection. In contrast, the head kidney and spleen of fish injected with frg16252–450, but not Nmistic+frg16252–450, spinycterins demonstrated upregulation of interferon and antigen-presenting genes. Intravenous injection of Nmistic+frg16252–450 spinycterins resulted in a higher innate immune response in RBCs while frg16252–450 spinycterins increased the immune response in head kidney and spleen. Although more studies are required to evaluate the practicality of using spinycterins as fish viral vaccines, these results highlight the important contribution of RBCs to the fish innate immune response to antiviral prophylactics. •We have evaluated the immune response of RBCs to spinycterins expressing frg16252–450 inside or fused to Nmistic anchor-motif.•Nmistic+frg16252‐450 spinycterins showed higher attachment to RBCs and modulated the expression of immune-related genes.•Nmistic+frg16252‐450 spinycterins triggered higher innate immune response in RBCs than in head kidney and spleen.
ISSN:0044-8486
1873-5622
0044-8486
DOI:10.1016/j.aquaculture.2023.739303