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2003 | 192 | 3 | 287-293
Tytuł artykułu

Differential up-regulation of striatal dopamine transporter and α-synuclein by the pyrethroid insecticide permethrin

Treść / Zawartość
Abstrakt, słowa kluczowe
Źródło
Twórcy
Bibliografia
Dodatkowe informacje
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The effects of permethrin on striatal dopaminergic biomarkers were assessed in this study. Retired breeder male C57 B1/6 mice were given an ip dose of permethrin (0.1-200 mg/kg) at 7-day intervals, over a 2-week period (Days 0, 7, and 14). Animals were then sacrificed 1 day (t = 1), 14 days (t = 14), or 28 days after the last treatment (t = 28). Dopamine transporter (DAT) protein as assayed by Western blotting was increased to 115% in the 0.8 mg/kg group over that of control mice at t = 1 (P < 0.05). At t = 14, this value increased to 140% of control, and declined slightly to 133% of control at t = 28. The mice given the 1.5 mg/kg dose displayed a significant increase in DAT protein only at t = 28, to 145% of controls. Thus, upregulation of the DAT at low doses of PM is variable 24 h after treatment, and seems to stabilize by t = 28. The threshold dose for increasing DAT expression in Western blots by t = 28 was 0.2 mg/kg permethrin. [ 3 H]GBR 12935, used to assay DAT binding, followed the same trend as that for the Western blotting data for 0.8 and 1.5 mg/kg doses of permethrin over the 4 weeks posttreatment. At 200 mg/kg permethrin, DAT protein was unchanged vs controls (t = 1), but had significantly increased by t = 14 and continued to increase at t = 28, suggesting that the reduced dopamine transport at this dose was due to nerve terminal stress and that recovery had occurred. The protein α-synuclein was also significantly induced at the 1.5 mg/kg dose at t = 1; however, unlike DAT up-regulation, this effect had declined to control values by t = 14. Maximal induction of α-synuclein protein occurred at a dose of 50 mg/kg permethrin. These data provide evidence that the pyrethroid class of insecticides can modulate the dopaminergic system at low doses, in a persistent manner, which may render neurons more vulnerable to toxicant injury.
Czasopismo
Rocznik
Tom
192
Numer
3
Strony
287-293
Opis fizyczny
Twórcy
  • Neurotoxicology Laboratory, Department of Entomology, Virginia Polytechnic and State University, Blacksburg, VA 24061-0319, USA
  • Neurotoxicology Laboratory, Department of Entomology, Virginia Polytechnic and State University, Blacksburg, VA 24061-0319, USA
Bibliografia
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Kolekcja
Elsevier
Identyfikator YADDA
bwmeta1.element.elsevier-0e6bea90-1091-3435-9b0b-ae95b874a5a6
Identyfikatory
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