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The effects of ciguatoxin on the nerves of the teleost fish, Sillago ciliata

✍ Scribed by Dr. Andrew E. Flowers; Michael F. Capra; John Cameron

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 848 KB
Volume: 1
Category: Article
ISSN: 1056-9014
DOI: 10.1002/nt.2620010212

No coin nor oath required. For personal study only.

✦ Synopsis

The absolute refractory period, relative refractory period, and the duration and magnitude of the supernormal period were measured after incubation of fish newes with ciguatoxin and other channel modifying compounds, tetrodotoxin, veratridine, verapamil, and lignocaine. In vitro electrophysiological studies were carried out on the lateral line nerve of the whiting, S;//ago ciliafa Cwier. Electrophysiological changes in fish nerves after exposure to ciguatoxin (0.3 MU.ml-') and veratridine (1 x 10 -' M) are similar to changes that occur in mammalian nerves and include an increase in the absolute refractory period, the relative refractory period, and the magnitude and duration of supernormality. The effects of ciguatoxin (0.3 MU.ml-') in fish nerves were antagonised by tetrodotoxin (5 x 10 -l o M), verapamil(5 x 10 M), and lignocaine (1 x 10 -5 s/mf -'I. The nerves of Sihago ciliataused in this study respnded to ciguatoxin and its antagonists in a similar manner to mammalian news, suggesting that these teleost nerves have no specific electrophysiological mechanism to cope with this toxin.

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