Determination of toxicity equivalent factors for paralytic shellfish toxins by electrophysiological measurements in cultured neurons

Pérez, SheilaVale González, María del CarmenBotana López, Ana MaríaAlonso, EvaRodríguez Vieytes, MercedesBotana López, Luis Miguel2026-05-192026-05-192011-07-18Perez S, Vale C, Botana AM, Alonso E, Vieytes MR, Botana LM. Determination of toxicity equivalent factors for paralytic shellfish toxins by electrophysiological measurements in cultured neurons. Chem Res Toxicol. 2011 Jul 18;24(7):1153-7. doi: 10.1021/tx200173d. Epub 2011 Jun 8. PMID: 21619049.https://hdl.handle.net/10347/47255This document is the Accepted Manuscript version of a Published Article that appeared in final form in Chemical Research in Toxicology, copyright © 2011 American Chemical Society. To access the final published article, see https://doi.org/10.1021/tx200173dThe establishment of toxicity equivalent factors to develop alternative methods to animal bioassays for marine-toxin detection is an urgent need in the field of phycotoxin research. Paralytic shellfish poisoning (PSP) is one of the most severe forms of food poisoning. The toxins responsible for this type of poisoning are highly toxic natural compounds produced by dinoflagellates, which bind to voltage-gated Na+ channels causing the blockade of action potential propagation. In spite of the fact that several standards of PSP toxins are currently commercially available, there is scarcity of data on the biological activity of these toxins, a fact that limits the calculation of their toxicity equivalent factors. We have evaluated the potency of the commercial PSP toxin standards for their ability to inhibit voltage-dependent sodium currents in cultured neuronal cells by electrophysiological measurements. The in vitro potencies of the PSP toxin standards as indicated by their IC50 values were in the order Neosaxitoxin (NeoSTX) > decarbamoylsaxitoxin (dcSTX) > saxitoxin (STX) > gonyautoxin 1,4 (GTX1,4) > decarbamoylneosaxitoxin (dcNeoSTX) > gonyautoxin 2,3 (GTX2,3) > decarbamoylgonyautoxin 2,3 (dcGTX2,3) > gonyautoxin 5 (GTX5) > N-sulfocarbamoyl-gonyautoxin-2 and -3 (C1,2). The data obtained in this in vitro analysis correlated well with their previously reported toxicity values.engInvestigaciónDetermination of toxicity equivalent factors for paralytic shellfish toxins by electrophysiological measurements in cultured neuronsjournal article10.1021/tx200173d1520-5010open access