Biomedical

Automated Patch Clamp for the Detection of Tetrodotoxin in Pufferfish Samples







  Peer Reviewed

Abstract

Tetrodotoxin (TTX) is a marine toxin responsible for many intoxications around the world. Its presence in some pufferfish species and, as recently reported, in shellfish, poses a serious health concern. Although TTX is not routinely monitored, there is a need for fast, sensitive, reliable, and simple methods for its detection and quantification. In this work, we describe the use of an automated patch clamp (APC) system with Neuro-2a cells for the determination of TTX contents in pufferfish samples. The cells showed an IC50 of 6.4 nM for TTX and were not affected by the presence of muscle, skin, liver, and gonad tissues of a Sphoeroides pachygaster specimen (TTX-free) when analysed at 10 mg/mL. The LOD achieved with this technique was 0.05 mg TTX equiv./kg, which is far below the Japanese regulatory limit of 2 mg TTX equiv./kg. The APC system was applied to the analysis of extracts of a Lagocephalus sceleratus specimen, showing TTX contents that followed the trend of gonads > liver > skin > muscle. The APC system, providing an in vitro toxicological approach, offers the advantages of being sensitive, rapid, and reliable for the detection of TTX-like compounds in seafood.

Key Questions about TTX Detection in Pufferfish

The article "Automated Patch Clamp for the Detection of Tetrodotoxin in Pufferfish Samples" discusses the application of an automated patch clamp (APC) system using Neuro-2a cells to detect tetrodotoxin (TTX) in pufferfish samples. TTX is a potent marine toxin responsible for numerous intoxications worldwide, and its presence in pufferfish poses significant health risks. The study demonstrates that the APC system can effectively identify TTX content in pufferfish tissues, offering a rapid and reliable method for monitoring this toxin in seafood.

1. What is tetrodotoxin (TTX), and why is its detection important?

TTX is a potent marine neurotoxin found in various marine organisms, including pufferfish. It blocks sodium channels, leading to paralysis and potentially fatal respiratory failure. Detecting TTX is crucial to prevent foodborne poisoning from contaminated seafood.

2. How does the automated patch clamp (APC) system detect TTX in pufferfish samples?

The APC system utilizes Neuro-2a cells, which are sensitive to TTX-induced sodium channel blockade. By measuring changes in ion currents through these channels, the system can quantify TTX levels in pufferfish tissues.

3. What are the advantages of using the APC system for TTX detection?

The APC system offers a rapid, sensitive, and reliable method for detecting TTX in seafood. It allows for high-throughput screening, which is essential for ensuring the safety of seafood products.