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Receptor sites for amino acids in the facial taste system of the channel catfish

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Summary

  1. 1.

    Receptor sites for different amino acids in the facial taste system of the channel catfish, Ictalurus punctatus, were determined from in vivo electrophysiological cross-adaptation experiments.

  2. 2.

    Relatively independent receptor sites were indicated for L-proline, D-proline, D-arginine, L-histidine and L-lysine, as well as those previously reported for L-alanine, L-arginine and D-alanine.

  3. 3.

    The functional isolation of two nerve twigs that were more responsive to D-alanine than to L-alanine or to other test stimuli provided further evidence for the existence of D-alanine sites that are independent from those to L-alanine.

  4. 4.

    Under all cross-adaptation regimes, the taste responses to the majority of test stimuli were reduced. Various possible mechanisms accounting for this generalized reduction in action potential activity during adaptation are discussed.

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Abbreviations

RSE :

relative stimulatory effectiveness

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Authors and Affiliations

  1. Department of Zoology and Physiology, Louisiana State University, 70803-1725, Baton Rouge, LA, USA

    Sandra Wegert & John Caprio

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  1. Sandra Wegert
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  2. John Caprio
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Wegert, S., Caprio, J. Receptor sites for amino acids in the facial taste system of the channel catfish. J Comp Physiol A 168, 201–211 (1991). https://doi.org/10.1007/BF00218412

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  • DOI: https://doi.org/10.1007/BF00218412

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