Journal
MARINE DRUGS
Volume 14, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/md14020036
Keywords
antillatoxin; FMPblue; membrane potential; hNa(v)1; 7; rapid throughput
Categories
Funding
- National Natural Science Foundation of China [81473539, 81570696, 31270985]
- National High Technology Research and Development Program of China (863 Program) [2015AA020314]
- Excellent Youth Foundation of Jiangsu Scientific Committee [BK20140029]
- Jiangsu Provincial Natural Science Foundation [BK20141357]
- State Key Laboratory of Natural Medicines, China Pharmaceutical University [SKLNMZZJQ201402]
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences [KF-2015-13]
- Fundamental Research Funds for the Central Universities [Z114037]
- Grants-in-Aid for Scientific Research [26253003] Funding Source: KAKEN
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Voltage-gated sodium channels (VGSCs) are responsible for the generation of the action potential. Among nine classified VGSC subtypes (Na(v)1.1-Na(v)1.9), Na(v)1.7 is primarily expressed in the sensory neurons, contributing to the nociception transmission. Therefore Na(v)1.7 becomes a promising target for analgesic drug development. In this study, we compared the influence of an array of VGSC agonists including veratridine, BmK NT1, brevetoxin-2, deltamethrin and antillatoxin (ATX) on membrane depolarization which was detected by Fluorescence Imaging Plate Reader (FLIPR) membrane potential (FMP) blue dye. In HEK-293 cells heterologously expressing hNa(v)1.7 -subunit, ATX produced a robust membrane depolarization with an EC50 value of 7.8 +/- 2.9 nM whereas veratridine, BmK NT1, and deltamethrin produced marginal response. Brevetoxin-2 was without effect on membrane potential change. The ATX response was completely inhibited by tetrodotoxin suggesting that the ATX response was solely derived from hNa(v)1.7 activation, which was consistent with the results where ATX produced a negligible response in null HEK-293 cells. Six VGSC antagonists including lidocaine, lamotrigine, phenytoin, carbamazepine, riluzole, and 2-amino-6-trifluoromethylthiobenzothiazole all concentration-dependently inhibited ATX response with IC50 values comparable to that reported from patch-clamp experiments. Considered together, we demonstrate that ATX is a unique efficacious hNa(v)1.7 activator which offers a useful probe to develop a rapid throughput screening assay to identify hNa(v)1.7 antagonists.
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