A novel protein isolated from the serum of rabbitfish (Siganus oramin) is lethal to Cryptocaryon irritans

Fish & Shellfish Immunology
Fanghua WangAn-Xing Li

Abstract

The susceptibility of eight marine fish species cultured in South China were tested for infection by the parasitic ciliate, Cryptocaryon irritans, via a challenge examination and an immobilization assay. All species of fish (representing six different families) that we investigated were infected by C. irritans except the rabbitfish (Siganus oramin), which displayed resistance to C. irritans infection. The infection intensity of rabbitfish (0.92+/-0.97, p<0.05) was significantly lower while the immobilization titres of rabbitfish serum were significantly higher (44.51+/-22.98, p<0.05) than the other seven species of fish. Additionally, the serum of the rabbitfish presented a strong killing effect to C. irritans in vitro. Light microscopy, scanning electron microscopy and fluorescence microscopy confirmed that rabbitfish serum could induce the theront cilia fall off, rupture of the cell membrane because of the swell and rupture of the macronucleus. Rabbitfish serum could also induce the rupture of the trophont membrane and content efflux. Herein a novel antiparasitic protein (APP) was isolated and purified from the serum of rabbitfish (S. oramin) by using a series of salting-out, cation exchange chromatography and two step of rev...Continue Reading

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Citations

Oct 12, 2013·Fish & Shellfish Immunology·Ruijun LiAnxing Li
Dec 8, 2016·Parasites & Vectors·Ze-Quan MoXue-Ming Dan

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