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Molecular cloning and expression analysis of coagulation factor VIII and plasminogen involved in immune response to GCRV, and immunity activity comparison of grass carp Ctenopharyngodon idella with different viral resistance.

Fish Shellfish Immunol.2019 Mar;86:794-804. Epub 2018 Dec 14
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摘要


The grass carp reovirus (GCRV) has been shown to cause lethal infections in the grass carp Ctenopharyngodon idella (C. idella). In order to investigate the immune response to GCRV infection, the full-length cDNA sequences of coagulation factor VIII (CiFVIII) and plasminogen (CiPLG) from C. idella were cloned and their involvement in the immune response was studied. The immunity factor levels in C. idella with different GCRV resistances were also analyzed. The full-length 2478 bp cDNA of CiFVIII contained an open reading frame of 1965 bp and encoded a putative polypeptide of 654 amino acid residues. The full-length 2907 bp cDNA of CiPLG contained an open reading frame of 2133 bp and encoded a putative polypeptide of 710 amino acid residues. CiFVIII was closely clustered with that of Clupea harengus. CiPLG was first clustered with those of Cyprinus carpio and Danio rerio. CiFVIII transcripts were most abundant in the liver and least in the skin. The highest expression level of CiPLG was observed in liver and the lowest in muscle. Expression levels of CiFVIII in gill, head kidney and spleen, and expression levels of CiPLG in gill, intestine and liver all reached the maximum at 72 h post GCRV infection. In spleen, expression levels of CiFVIII and CiPLG were significantly positively correlated. The activities of T-AOC, LSZ and IgM in R♂ were significantly higher than those in O♂. Likewise, T-AOC and LSZ activities in F1 were significantly higher than f1 individuals (P < 0.01). These results indicated that CiFVIII and CiPLG may play important roles in the immune response to GCRV infection. In addition, antioxidant ability and serum immune factor activity may confer a different viral resistance to C. idella.

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