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Updated: Apr 1, 2026
A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors
Published on: November 14, 2014
Development of a Highly Sensitive Cell-Based Assay for Detecting Botulinum Neurotoxin Type A through Neural Culture
Won S Hong1, Hannah M Pezzi1, Andrea R Schuster2
1Department of Biomedical Engineering, University of Wisconsin, Madison, WI, USA Wisconsin Institute for Medical Research and University of Wisconsin Carbone Cancer Center, Madison, WI, USA.
Abstract:
Botulinum neurotoxin (BoNT) is the most lethal naturally produced neurotoxin. Due to the extreme toxicity, BoNTs are implicated in bioterrorism, while the specific mechanism of action and long-lasting effect was found to be medically applicable in treating various neurological disorders. Therefore, for both public and patient safety, a highly sensitive, physiologic, and specific assay is needed. In this paper, we show a method for achieving a highly sensitive cell-based assay for BoNT/A detection using the motor neuron-like continuous cell line NG108-15. To achieve high sensitivity, we performed a media optimization study evaluating three commercially available neural supplements in combination with retinoic acid, purmorphamine, transforming growth factor β1 (TGFβ1), and ganglioside GT1b. We found nonlinear combinatorial effects on BoNT/A detection sensitivity, achieving an EC50 of 7.4 U ± 1.5 SD (or ~7.9 pM). The achieved detection sensitivity is comparable to that of assays that used primary and stem cell-derived neurons as well as the mouse lethality assay.
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