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Experience-dependent modulation of antennal sensitivity and input to antennal lobes in male moths (Spodoptera littoralis) pre-exposed to sex pheromone
Fernando Guerrieri, Cesar Gemeno, Christelle Monsempes, Sylvia Anton, Emmanuelle Jacquin-Joly, Philippe Lucas, Jean-Marc Devaud


Sex pheromones are intraspecific olfactory signals emitted by one sex to attract a potential mating partner. Behavioural responses to sex pheromones are generally highly stereotyped. However, they can be modulated by experience, as male moths previously exposed to female sex pheromone respond with a lower threshold upon further detection, even after long delays. Here, we address the question of the neural mechanisms underlying such long-term modulation. As previous work has shown increased responses to pheromone in central olfactory neurons, we asked whether brief exposure to the pheromone increases input activity from olfactory receptor neurons. Males pre-exposed to sex pheromone exhibited increased peripheral sensitivity to the main pheromone component. Among nine antennal genes targeted as putatively involved in pheromone reception, one encoding a pheromone-binding protein showed significant upregulation upon exposure. In the primary olfactory centre (antennal lobe), the neural compartment processing the main pheromone component was enlarged after a brief pheromone exposure, thus suggesting enduring structural changes. We hypothesise that higher peripheral sensitivity following pre-exposure leads to increased input to the antennal lobe, thus contributing to the structural and functional reorganization underlying a stable change in behaviour.


  • * Present address: Institut de Recherche sur la Biologie de l'Insecte (UMR 6035), CNRS/Université François Rabelais, Faculté de Sciences et Techniques, Avenue Monge, Parc Grandmont, 37200 Tours, France

  • Present address: Laboratoire Récepteurs et Canaux Ioniques Membranaires (UPRES-EA 2647–USC INRA 1330), UFR Sciences, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex 01, France


    F.J.G. is a former scientific collaborator of Max-Planck-Gesellschaft (MPG; Germany), funded by the European Research Group in Neurosciences between the National Centre for Scientific Research (CNRS; France) and the MPG. C.G. was funded by the ‘Programa de movilidad’ Ministerio de Ciencia e Innovación (MICINN), Spain. This work was supported by French National Funding Agency Grants ANR-07-NEURO-037-01 and ANR-09-BLAN-0239-01.


    antennal lobe
    action potential
    macroglomerular complex
    olfactory receptor neuron
    pheromone-binding protein
    pheromone-degrading enzyme
    projection neuron
    pheromone receptor
    Z9,E11-tetradecenyl acetate
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