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A tissue culture assay for tetrodotoxin, saxitoxin and related toxins
K Kogure1, M L Tamplin, U Simidu
1Center of Marine Biotechnology, University of Maryland, Baltimore 21202.
Abstract:
In the presence of ouabain, veratridine enhances sodium influx in the mouse neuroblastoma cell line Neuro-2A (ATCC, CCL131), causing cellular swelling and subsequent death. Tetrodotoxin (puffer fish toxin) or saxitoxin (paralytic shellfish poison), both of which block the sodium channel of excitable membranes, antagonize this effect, enabling cell growth to continue. This phenomenon was used as the basis of a new assay for these toxins. It is also possible to estimate the quantity of TTX from the relationship between TTX concentration and percentage of living cells. This new method is simple, inexpensive, and sensitive, and may replace the conventional mouse bioassay.
Insights
A new assay uses cell swelling to detect sodium channel toxins like tetrodotoxin (TTX) and saxitoxin. This simple, sensitive method offers a potential replacement for traditional mouse bioassays in toxin detection.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Veratridine enhances sodium influx in Neuro-2A cells, leading to cell death.
- Sodium channel blockers tetrodotoxin (TTX) and saxitoxin antagonize this veratridine effect.
- This interaction provides a basis for a novel toxin detection assay.
Purpose of the Study:
- To develop a new assay for detecting sodium channel toxins.
- To utilize the antagonistic effect of TTX and saxitoxin on veratridine-induced cell death.
- To establish a simple, sensitive, and cost-effective method for toxin quantification.
Main Methods:
- Utilizing the mouse neuroblastoma cell line Neuro-2A.
- Inducing sodium influx with ouabain and veratridine.
- Assessing cell viability in the presence of varying concentrations of TTX or saxitoxin.
Main Results:
- Veratridine-induced cell death was antagonized by TTX and saxitoxin.
- Cell growth was restored in the presence of these sodium channel blockers.
- A quantitative relationship was established between TTX concentration and cell survival.
Conclusions:
- A novel, simple, and sensitive assay for TTX and saxitoxin has been developed.
- The assay relies on the blockade of sodium channels by these toxins.
- This cell-based assay may serve as a viable alternative to conventional mouse bioassays.