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

J Comp Physiol A. 1991 Feb;168(2):201-11. doi: 10.1007/BF00218412.


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. 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. 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. 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.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Action Potentials / physiology
  • Adaptation, Physiological / physiology
  • Alanine / physiology
  • Animals
  • Arginine / physiology
  • Electrophysiology
  • Glutamates / physiology
  • Glutamic Acid
  • Histidine / physiology
  • Ictaluridae / physiology*
  • Lysine / physiology
  • Methionine / physiology
  • Proline / physiology
  • Receptors, Amino Acid
  • Receptors, Cell Surface / physiology*
  • Stereoisomerism
  • Taste / physiology*


  • Glutamates
  • Receptors, Amino Acid
  • Receptors, Cell Surface
  • Glutamic Acid
  • Histidine
  • Arginine
  • Proline
  • Methionine
  • Lysine
  • Alanine