Toxicity Equivalency Factors for Tetrodotoxin Analogues Determined with Automated Patch Clamp on Voltage-Gated Sodium...

Area of Science:

• Marine toxicology
• Neuroscience
• Analytical chemistry

Background:

• Tetrodotoxin (TTX) is a potent marine neurotoxin causing human poisonings.
• Over 30 TTX analogues exist, but their toxicities and roles in poisoning are largely unknown.
• Accurate toxicological assessment is crucial for seafood safety.

Purpose of the Study:

• To determine the toxicity equivalency factors (TEFs) of five TTX analogues.
• To assess the utility of automated patch clamp (APC) for toxicological evaluation of TTX analogues.
• To translate analytical data into meaningful toxicological information for seafood safety.

Main Methods:

• Automated patch clamp (APC) was used to assess the blockade of voltage-gated sodium channels by TTX analogues.
• Toxicity equivalency factors (TEFs) were derived for five TTX analogues.
• Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) measured analogue concentrations in pufferfish.
• TEFs were applied to LC-MS/MS data for toxicological interpretation.

Main Results:

• All five TTX analogues exhibited lower toxicity than TTX.
• TEFs were successfully derived for the studied TTX analogues.
• TEFs effectively translated LC-MS/MS data into toxicological insights.
• APC proved effective for toxicological assessment of TTX analogues.

Conclusions:

• TTX analogues are less toxic than TTX, but require toxicological evaluation.
• TEFs are valuable for assessing the toxicological impact of TTX analogues in seafood.
• Automated patch clamp (APC) is a promising bioanalytical tool for seafood safety management and human health protection.
• This study provides a framework for assessing TTX analogue toxicity in marine ecosystems.