Isolation of 6-deoxytetrodotoxin from the pufferfish, takifugu pardalis, and a comparison of the effects of the C-6 and C-11 hydroxy groups of tetrodotoxin on its activity

Yuta Kudo, Julian Finn, Kohei Fukushima, Satsuki Sakugawa, Yuko Cho, Keiichi Konoki, Mari Yotsu-Yamashita

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Identification of new tetrodotoxin (TTX, 1) analogues would be significant in the elucidation of its biosynthetic pathway and a study of its structure-activity relationships. In this study, a new TTX analogue, 6-deoxyTTX (2), was isolated from the ovary of the pufferfish, Takifugu pardalis, and the structure was determined using spectroscopic methods. Compound 2 was also identified in other marine animals, Nassarius snail and blue-ringed octopuses, using LC-MS. Furthermore, we investigated the voltage-gated sodium channel blocking activity of 2 by examination of the inhibitory activities to cytotoxicity induced by ouabain and veratridine in mouse neuroblastoma cells (Neuro-2a). The activities were then compared with those of 1, 11-deoxyTTX (3), and 6,11-dideoxyTTX (4). The EC50 value for 2 was estimated to be 6.5 ± 2.2 nM, approximately 3-fold larger than that of 1 (2.1 ± 0.6 nM) and approximately 20-fold smaller than that of 3. These results suggested that contribution of the C-6 hydroxy group to the activity is less than that of the C-11 hydroxy group.

Original languageEnglish
Pages (from-to)1000-1004
Number of pages5
JournalJournal of Natural Products
Volume77
Issue number4
DOIs
Publication statusPublished - 2014 Apr 25

ASJC Scopus subject areas

  • Analytical Chemistry
  • Molecular Medicine
  • Pharmacology
  • Pharmaceutical Science
  • Drug Discovery
  • Complementary and alternative medicine
  • Organic Chemistry

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