論文

査読有り 国際誌
2020年3月

Immune responses induced by oil-adjuvanted inactivated vaccine against Flavobacterium psychrophilum in ayu Plecoglossus altivelis.

Fish & shellfish immunology
  • Goshi Kato
  • ,
  • Yosuke Isaka
  • ,
  • Kyuma Suzuki
  • ,
  • Shun Watanabe
  • ,
  • Shotaro Izumi
  • ,
  • Chihaya Nakayasu
  • ,
  • Makoto Endo
  • ,
  • Motohiko Sano

98
開始ページ
585
終了ページ
594
記述言語
英語
掲載種別
DOI
10.1016/j.fsi.2020.01.054

Oil-adjuvant formulated formalin killed cells of Flavobacterium psychrophilum (FKC + Adj) is strongly effective against bacterial cold-water disease (BCWD) in ayu Plecoglossus altivelis. In this study, we aimed to understand mechanisms underlying the strong protection by the vaccine in ayu. Antibody titer of FKC + Adj and formalin-killed cells (FKC) group was significantly higher than those of modified cytophaga broth injected (MCY) group and MCY with the adjuvant (MCY + Adj) group. The highest antibody titer was observed in FKC + Adj group. Granulomatous inflammation without lymphocyte cuff was observed in the spleen and trunk kidney of FKC + Adj and MCY + Adj group, while the size of the granuloma was bigger in FKC + Adj than in MCY + Adj group. Gene expression level for IL-8 was significantly up-regulated in FKC + Adj group at 4 weeks after the vaccination. In contrast, IL-10 gene expression level was significantly suppressed in FKC + Adj at 4 weeks after the vaccination. F. psychrophilum was almost cleared in the spleen and trunk kidney of FKC + Adj group within 2 days after the challenge. Fluorescent immunohistochemistry showed that a lot of bacterial signals were detected in the spleen and trunk kidney of challenged fish in MCY, FKC and MCY + Adj group. However, the fluorescent signal was not detected in the organs of FKC + Adj group after the challenge. These data suggest that F. psychrophilum is immediately cleared in FKC + Adj vaccinated fish and both specific antibody and activation of phagocytes are essential to clear F. psychrophilum in ayu.

リンク情報
DOI
https://doi.org/10.1016/j.fsi.2020.01.054
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/32004616

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