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Peripheral coding of bitter taste in Drosophila
Nicolas Meunier1, Frédéric Marion-Poll, Jean-Pierre Rospars
1INRA Station de Phytopharmacie et Médiateurs Chimiques, 78026 Versailles Cedex, France. nmeunier@versailles.inra.fr
Journal of Neurobiology
|July 3, 2003
Summary
Fruit flies detect bitter compounds using taste neurons in their legs. Bitter substances activate specific taste cells and inhibit sugar and water taste neurons, revealing a dual detection mechanism.
Area of Science:
- Neuroscience
- Sensory Biology
- Insect Physiology
Background:
- Taste receptors are vital for identifying bitter compounds, preventing the ingestion of toxins.
- Insects like Drosophila utilize taste sensilla for detecting various chemical stimuli.
Purpose of the Study:
- To investigate the role of taste sensilla on Drosophila prothoracic legs in detecting bitter compounds.
- To elucidate the mechanisms by which bitter compounds interact with taste neurons, including those responsive to sugars and water.
Main Methods:
- Utilized a novel statistical approach analyzing interspike intervals to study taste neuron responses.
- Examined the activation and inhibition patterns of taste neurons in response to bitter compounds, sugars, and water.
Main Results:
- Bitter compounds were found to activate the L2 taste cell with a latency of at least 50 ms.
- Bitter compounds directly inhibited sugar (S) and water (W) taste neurons, even when L2 cells were not activated.
- Inhibition latencies were similar to L2 cell excitation latencies, suggesting shared transduction pathways.
Conclusions:
- Drosophila leg taste sensilla employ a dual mechanism for bitter detection: direct L2 cell activation and S/W cell inhibition.
- Differential sensitivity across sensilla suggests varied expression of bitter receptors in L2 cells.
- The findings provide a physiological basis for understanding bitter compound detection and discrimination in insects.