Pathogenesis of acute hepatopancreatic necrosis disease (AHPND) in shrimp

Hung Chiao Lai, Tze Hann Ng, Masahiro Ando, Chung Te Lee, I. Tung Chen, Jie Cheng Chuang, Rapeepat Mavichak, Sheng Hsiung Chang, Mi De Yeh, Yi An Chiang, Haruko Takeyama, Hiro o. Hamaguchi, Chu Fang Lo, Takashi Aoki, Han Ching Wang*

*この研究の対応する著者

研究成果: Article査読

127 被引用数 (Scopus)

抄録

Acute hepatopancreatic necrosis disease (AHPND), also called early mortality syndrome (EMS), is a recently emergent shrimp bacterial disease that has resulted in substantial economic losses since 2009. AHPND is known to be caused by strains of Vibrio parahaemolyticus that contain a unique virulence plasmid, but the pathology of the disease is still unclear. In this study, we show that AHPND-causing strains of V. parahaemolyticus secrete the plasmid–encoded binary toxin PirABvp into the culture medium. We further determined that, after shrimp were challenged with AHPND-causing bacteria, the bacteria initially colonized the stomach, where they started to produce PirABvp toxin. At the same early time point (6 hpi), PirBvp toxin, but not PirAvp toxin, was detected in the hepatopancreas, and the characteristic histopathological signs of AHPND, including sloughing of the epithelial cells of the hepatopancreatic tubules, were also seen. Although some previous studies have found that both components of the binary PirABvp toxin are necessary to induce a toxic effect, our present results are consistent with other studies which have suggested that PirBvp alone may be sufficient to cause cellular damage. At later time points, the bacteria and PirAvp and PirBvp toxins were all detected in the hepatopancreas. We also show that Raman spectroscopy “Whole organism fingerprints” were unable to distinguish between AHPND-causing and non-AHPND causing strains. Lastly, by using minimum inhibitory concentrations, we found that both virulent and non-virulent V. parahaemolyticus strains were resistant to several antibiotics, suggesting that the use of antibiotics in shrimp culture should be more strictly regulated.

本文言語English
ページ(範囲)1006-1014
ページ数9
ジャーナルFish and Shellfish Immunology
47
2
DOI
出版ステータスPublished - 2015 12 1

ASJC Scopus subject areas

  • 環境化学
  • 水圏科学

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