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Featured ArticleArticles, Systems/Circuits

Differential Combinatorial Coding of Pheromones in Two Olfactory Subsystems of the Honey Bee Brain

Julie Carcaud, Martin Giurfa and Jean-Christophe Sandoz
Journal of Neuroscience 11 March 2015, 35 (10) 4157-4167; DOI: https://doi.org/10.1523/JNEUROSCI.0734-14.2015
Julie Carcaud
1Evolution, Genomes, Behavior and Ecology Lab, CNRS, Université Paris-Sud, IRD (UMR 9191), F-91198 Gif-sur-Yvette, France,
2Research Center on Animal Cognition, Université de Toulouse, F-31062 Toulouse Cedex 9, France, and
3Research Center on Animal Cognition, Centre National de la Recherche Scientifique, F-31062 Toulouse Cedex 9, France
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Martin Giurfa
2Research Center on Animal Cognition, Université de Toulouse, F-31062 Toulouse Cedex 9, France, and
3Research Center on Animal Cognition, Centre National de la Recherche Scientifique, F-31062 Toulouse Cedex 9, France
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Jean-Christophe Sandoz
1Evolution, Genomes, Behavior and Ecology Lab, CNRS, Université Paris-Sud, IRD (UMR 9191), F-91198 Gif-sur-Yvette, France,
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Abstract

Neural coding of pheromones has been intensively studied in insects with a particular focus on sex pheromones. These studies favored the view that pheromone compounds are processed within specific antennal lobe glomeruli following a specialized labeled-line system. However, pheromones play crucial roles in an insect's life beyond sexual attraction, and some species use many different pheromones making such a labeled-line organization unrealistic. A combinatorial coding scheme, in which each component activates a set of broadly tuned units, appears more adapted in this case. However, this idea has not been tested thoroughly. We focused here on the honey bee Apis mellifera, a social insect that relies on a wide range of pheromones to ensure colony cohesion. Interestingly, the honey bee olfactory system harbors two central parallel pathways, whose functions remain largely unknown. Using optophysiological recordings of projection neurons, we compared the responses of these two pathways to 27 known honey bee pheromonal compounds emitted by the brood, the workers, and the queen. We show that while queen mandibular pheromone is processed by l-ALT (lateral antennal lobe tract) neurons and brood pheromone is mainly processed by m-ALT (median antennal lobe tract) neurons, worker pheromones induce redundant activity in both pathways. Moreover, all tested pheromonal compounds induce combinatorial activity from several AL glomeruli. These findings support the combinatorial coding scheme and suggest that higher-order brain centers reading out these combinatorial activity patterns may eventually classify olfactory signals according to their biological meaning.

  • insect
  • olfaction
  • optical imaging
  • parallel processing
  • pheromone
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The Journal of Neuroscience: 35 (10)
Journal of Neuroscience
Vol. 35, Issue 10
11 Mar 2015
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Differential Combinatorial Coding of Pheromones in Two Olfactory Subsystems of the Honey Bee Brain
Julie Carcaud, Martin Giurfa, Jean-Christophe Sandoz
Journal of Neuroscience 11 March 2015, 35 (10) 4157-4167; DOI: 10.1523/JNEUROSCI.0734-14.2015

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Differential Combinatorial Coding of Pheromones in Two Olfactory Subsystems of the Honey Bee Brain
Julie Carcaud, Martin Giurfa, Jean-Christophe Sandoz
Journal of Neuroscience 11 March 2015, 35 (10) 4157-4167; DOI: 10.1523/JNEUROSCI.0734-14.2015
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Keywords

  • insect
  • olfaction
  • optical imaging
  • parallel processing
  • pheromone

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