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Immobilization antibodies of tiger puffer Takifugu rubripes induced by i.p. injection against monogenean Heterobothrium okamotoi oncomiracidia do not prevent the infection

Published online by Cambridge University Press:  19 January 2007

N. UMEDA ,
A. HATANAKA  and
N. HIRAZAWA
N. UMEDA
Affiliation:
Marine Biological Technology Center, Nippon Suisan Kaisha, Ltd, Saeki, Oita 876-1204, Japan
A. HATANAKA
Affiliation:
Central Research Laboratories, Nippon Suisan Kaisha, Ltd, 559-6 Kitanomachi, Hachioji, Tokyo 192-0906, Japan
N. HIRAZAWA*
Affiliation:
Central Research Laboratories, Nippon Suisan Kaisha, Ltd, 559-6 Kitanomachi, Hachioji, Tokyo 192-0906, Japan
*
*Corresponding author: Central Research Laboratories, Nippon Suisan Kaisha, Ltd, 559-6 Kitanomachi, Hachioji, Tokyo 192-0906, Japan. Tel: +81 426 56 5195. Fax: +81 426 56 5188. E-mail: n-hiraza@nissui.co.jp
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Summary

We examined whether infection by the monogenean Heterobothrium okamotoi induces production of specific antibodies against oncomiracidia and their cilia, larvae on the gills, and adults on the branchial cavity wall of tiger puffer Takifugu rubripes. We also investigated whether specific antibody production participates in acquired protection against H. okamotoi. Sera from persistently infected fish immobilized H. okamotoi oncomiracidia 89 days after exposure and antibody levels (measured by enzyme-linked immunosorbent assays) in the sera against oncomiracidia and their cilia increased compared with sera from control (naïve) fish. Antibody levels in these sera against the larvae and adult stages did not increase. The number of H. okamotoi on persistently infected fish was significantly lower than for control fish (P<0·05) when persistently infected fish and control fish were exposed to oncomiracidia in the same tank. Thus tiger puffer produced specific antibodies against oncomiracidia and their cilia, and acquired partial protection against H. okamotoi. Intraperitoneal injection of proteins of sonicated oncomiracidia or their cilia with an adjuvant also produced oncomiracidium agglutination antibodies in sera from tiger puffer; the antibody levels in these sera against oncomiracidia and their cilia increased compared with sera from control fish (injection of BSA with an adjuvant) at 14, 44, and 75 days after the booster immunization. However, in a parasite challenge at 54–58 days after the booster immunization, the infection levels of fish immunized with parasites of sonicated oncomiracidia or their cilia were the same as the control fish. Western blot showed that sera from persistently infected fish and fish immunized with sonicated oncomiracidia or their cilia recognized similar antigenic bands, suggesting that tiger puffer tends to react against these antigens compared with other antigens. These results indicated that specific antibodies against these cilia and oncomiracidia induced by i.p. injection do not prevent H. okamotoi infection.

Keywords

monogeneaHeterobothrium okamotoiTakifugu rubripesantibodyciliaoncomiracidiumacquired protection
Type
Research Article
Information
Parasitology , Volume 134 , Issue 6 , June 2007 , pp. 853 - 863
Copyright
Copyright © Cambridge University Press 2007

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