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Acta Trop

Title:		Electrophysiological responses of the olfactory receptors of the tick Amblyomma cajennense (Acari: Ixodidae) to host-related and tick pheromone-related synthetic compounds
Author(s):		Soares SF; Borges LM;
Address:		"Escola de Veterinaria e Zootecnia, Universidade Federal de Goias Campus II, Samambaia, Goiania, Brazil. sfsoares@gmail.com"
Journal Title:		Acta Trop
Year:		2012
Volume:		20120819
Issue:		3
Page Number:		192 - 198
DOI:		10.1016/j.actatropica.2012.08.007
ISSN/ISBN:		1873-6254 (Electronic) 0001-706X (Linking)
Abstract:		"In the present study, host-related and tick pheromone-related chemical compounds were tested by means of the tip-recording technique in order to obtain electrophysiological responses in olfactory sensilla of non-fed Amblyomma cajennense ticks. The following chemicals were tested on the multiporose sensilla DI.1, located anterior to Haller's organ, and the sensillum DII.1, in the anterior pit of this organ: isobutyric acid, butyric acid, valeric acid, trans-2-heptenal, heptanal, benzaldehyde, salicylaldehyde, nonanal, m-, o- and p-tolualdehyde, 2-furaldehyde, 3-pentanone, gamma-valerolactone and 1-octen-3-ol (which are all vertebrate-associated volatiles); and 2,6-dichlorophenol (2,6-DCP), 2-nitrophenol, methyl salicylate and nonanoic acid (tick pheromone components). These were used at 10(-3)M and 10(-2)M on at least 10 ticks per substance, and the chemicals that were found to be active at these concentrations were then tested as a series from 10(-6)M to 10(-2)M, in decadic steps, on at least 15 ticks per substance. 2,6-DCP was active on both sensilla, with detection thresholds of 10(-6)M on the DI.1 sensillum and 10(-4)M on the DII.1 sensillum. The olfactory neurons of this sensillum also responded to nonanal at the highest concentration used (10(-2)M), while those of DII.1 responded not only to 2.6 DCP but also to 2-nitrophenol (to the same extent as to 2,6-DCP) and to 1-octen-3-ol. These results confirm the importance of 2,6-DCP in the chemical ecology of A. cajennense and indicate other compounds that may interfere with the behavior of this tick and which should be investigated"
Keywords:		Animals *Electrophysiological Phenomena Female Ixodidae/*drug effects/*physiology Olfactory Receptor Neurons/physiology Pheromones/*pharmacology;
Notes:		"MedlineSoares, Sara Fernandes Borges, Ligia Miranda Ferreira eng Research Support, Non-U.S. Gov't Netherlands 2012/08/29 Acta Trop. 2012 Dec; 124(3):192-8. doi: 10.1016/j.actatropica.2012.08.007. Epub 2012 Aug 19"