Accumulation of tetrodotoxin and 4,9-anhydrotetrodotoxin in cultured juvenile kusafugu Fugu niphobles by dietary administration of natural toxic komonfugu Fugu poecilonotus liver.
Non-toxic cultured juvenile kusafugu Fugu niphobles were fed with a diet containing highly toxic natural komonfugu Fugu poecilonotus liver until the 30th day (8.0 microg of TTX and 3.7 microg of 4,9-anhydroTTX/fish/day), and then fed with a non-toxic diet until the 240th day. During the 30-240th day, five or six fish were periodically sampled six times, and the contents of TTX and 4,9-anhydroTTX in each tissue were determined. The total TTX and 4,9-anhydroTTX accumulated in all tissues tested was not significantly changed during the experimental period, both being kept at 70% of administrated doses. However, in the liver, the TTX content accounted to be 120 microg (50% of administrated) on the 30th day, and then it gradually decreased to 50 microg until the 240th day, while 4,9-anhydroTTX content was kept at approximately 40 microg (40% of administrated) during all the experimental periods. In contrast to the liver, in the skin, TTX and 4,9-anhydroTTX were 40 and 5 microg, respectively, on the 30th day, and then gradually increased to 80 and 24 microg, respectively, until the 240th day. In the intestine, TTX and 4,9-anhydroTTX contents were kept at 25 and 12 microg, respectively, during all the experimental periods. According to these results, we assumed that a part of TTX accumulated in the liver was slowly transferred to the skin.
Kono
Michiko
M
Fisheries Research Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 2971-4 Maisaka-cho Nishi-ku Hamamatsu, Shizuoka 431-0214, Japan. amkono@mail.ecc.u-tokyo.ac.jp
Matsui
Takashi
T
Furukawa
Kiyoshi
K
Yotsu-Yamashita
Mari
M
Yamamori
Kunio
K
D000284:Administration, Oral; D000821:Animal Feed; D000818:Animals; D005506:Food Contamination; D008018:Life Cycle Stages / Q000187:drug effects / Q000502:physiology*; D008099:Liver / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D012867:Skin / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism; D026941:Sodium Channel Blockers / Q000493:pharmacokinetics* / Q000633:toxicity; D023741:Takifugu / Q000254:growth & development / Q000378:metabolism*; D013779:Tetrodotoxin / Q000031:analogs & derivatives* / Q000493:pharmacokinetics* / Q000633:toxicity
D026941:Sodium Channel Blockers; C047739:anhydrotetrodotoxin; D013779:Tetrodotoxin