Actions of the pyrethroid insecticides cismethrin and cypermethrin on house fly Vssc1 sodium channels expressed in Xenopus oocytes

Archives of Insect Biochemistry and Physiology
T J SmithDavid M Soderlund

Abstract

Voltage-sensitive sodium channels encoded by the Vssc1 gene of the house fly (Musca domestica) were expressed in Xenopus laevis oocytes in combination with the tipE gene product of Drosophila melanogaster and were characterized by two-electrode voltage clamp. Vssc1/tipE sodium channels expressed in oocytes were highly sensitive to tetrodotoxin; half-maximal inhibition of sodium currents by tetrodotoxin was obtained at a concentration of 2.4 nM. Cismethrin, a pyrethroid that produces Type I effects on intact nerve, slowed the inactivation of sodium currents carried by Vssc1/tipE channels during a depolarizing pulse and induced a tail current after repolarization that decayed with a first-order time constant of approximately 650 ms. The voltage dependence of activation and steady-state inactivation of cismethrin-modified channels were shifted to more negative potentials. Cypermethrin, a pyrethroid with Type II effects on intact nerve, also prolonged the inactivation of Vssc1/tipE sodium channels and induced a tail current. However, the cypermethrin-induced tail current was extremely persistent, decaying with a first-order time constant of approximately 42 s. Unlike cismethrin, the effect of cypermethrin was use dependent, requiri...Continue Reading

References

Jun 1, 1992·Trends in Pharmacological Sciences·T Narahashi
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Feb 25, 1998·Insect Biochemistry and Molecular Biology·T J SmithD M Soderlund

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Citations

Jun 29, 2011·Archives of Toxicology·David M Soderlund
Feb 3, 2005·Environmental Health Perspectives·Timothy J ShaferKevin M Crofton
Jul 24, 2010·Pesticide Biochemistry and Physiology·David M Soderlund
Apr 3, 2008·Pest Management Science·David M Soderlund
Sep 21, 2005·Invertebrate Neuroscience : in·Valérie Raymond-DelpechDavid B Sattelle
Nov 25, 2003·The Journal of Pharmacology and Experimental Therapeutics·Michael E HildebrandAnthony Stea
May 29, 2003·Insect Biochemistry and Molecular Biology·D M Soderlund, D C Knipple
Aug 15, 2021·Toxicology and Applied Pharmacology·Stefanie Nicole Bothe, Angelika Lampert

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