Abstract
ATP-binding cassette (ABC) transporters are responsible for pumping drugs across membranes and are an important drug detoxification mechanism. Since ABC transporters act on a wide spectrum of chemical compounds, they have been associated with multidrug resistance phenotype in various parasites and cancer cells. Here, we document the presence of a Rhipicephalus (Boophilus) microplus tick population (Jaguar) resistant to four acaricide classes (organophosphates (OP), synthetic pyrethroids (SP), amitraz and macrocyclic lactones (ML)) and reveal that the cattle tick has a multidrug detoxification mechanism based on ABC transporter proteins. Acaricide toxicity was assessed using the larval packet test (LPT), and mortality data were subjected to probit analysis using a susceptible strain (POA) as reference. Larvae were pre-exposed to sub-lethal doses of the ABC-transporter inhibitors, cyclosporin A (CsA) and MK571, and subsequently treated with ivermectin, abamectin, moxidectin, chlorpyriphos, cypermethrin, or amitraz in LPT. Results show that lethal concentrations 50 % (LC50) of ivermectin, abamectin, moxidectin (MLs), and chlorpyriphos (OP) were significantly reduced in larvae exposed to CsA and MK571 inhibitors in the Jaguar resistant population, but LC50 did not change in POA susceptible strain larvae. LC50 of cypermetrin (SP) and amitraz remained unchanged in inhibitor-exposed larvae, compared to larvae from Jaguar and POA strains not exposed to inhibitor. These results suggest that ABC transporter proteins can protect ticks against a wide range of acaricides and have an important implication in drug resistance development as a multidrug detoxification mechanism.
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Acknowledgment
We thank the CNPq—Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, FINEP, CAPES, CNPq and FAPERGS for supporting our work.
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Supporting Fig. 1
Effect of CsA and MK571 (15 μM) on mortality of susceptible (POA) R. microplus larvae to acaricides determined by LPT, as described in Fig. 1 (PDF 94 kb)
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Pohl, P.C., Klafke, G.M., Júnior, J.R. et al. ABC transporters as a multidrug detoxification mechanism in Rhipicephalus (Boophilus) microplus . Parasitol Res 111, 2345–2351 (2012). https://doi.org/10.1007/s00436-012-3089-1
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DOI: https://doi.org/10.1007/s00436-012-3089-1