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Insecticidal bioassays on Plutella xylostella (Linneaus) of an oxadiazine insecticide indoxacarb and its N-decarbomethoxylated metabolite (DCJW), and their modulation of voltage-gated sodium channels in rat dorsal root ganglion neurons were examined. No significant difference was observed in insecticidal activity between indoxacarb and DCJW in ingestion and contact tests. In patch-clamp experiments, both indoxacarb and DCJW suppressed the peak sodium currents in a time- and dose-dependent manner. DCJW at 1 μM blocked the sodium currents to 62.7±3.0% (n=5) of the control after 25 min of bath application. In contrast, in the presence of 1 μM indoxacarb, currents were blocked to 4.5±0.6% (n=4) of control. Thus, the potency of DCJW in blocking sodium currents was higher than that of indoxacarb in rat dorsal root ganglion neurons.

applied entomology and zoology

Insecticidal activity of oxadiazine insecticide indoxacarb and its N-decarbomethoxylated metabolite and their modulations of voltage-gated sodium channels.