Chem. Senses 25: 501-506,
2000
© Oxford University Press 2000
Glossopharyngeal Taste Responses of the Channel Catfish to Binary Mixtures of Amino Acids
Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA 1 Current address: Department of Otolaryngology, Kagoshima University Medical School, 8-35-1 Sakuragaoka, Kagoshima 890, Japan
Correspondence to be sent to: J. Caprio, Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA. e-mail: jcap{at}lsu.edu
This study examines the neural processing of binary mixtures in the glossopharyngeal (IX) taste system of the channel catfish, Ictalurus punctatus, and finds that the nature of the components of a mixture determines the intensity of the neural response to it. Taste buds in fish innervated by IX are located along the gill rakers of the first gill arch and rostral floor of the oral cavity, and function primarily in the consummatory phase of feeding behavior; however, few studies of IX taste responses have been reported in any species of teleost. Here, we report IX taste responses to eight different binary mixtures of amino acids whose components were adjusted to be approximately equipotent in electrophysiological recordings. Four binary (group I) mixtures whose components were indicated from prior electrophysiological cross-adaptation experiments to bind to independent receptor sites resulted in significantly larger (22% average increase) integrated IX taste activity than four other (group II) binary mixtures whose components were indicated to bind to the same or highly cross-reactive receptor sites. These results are similar to those observed previously from facial nerve recordings in channel catfish, and to olfactory and taste responses in other vertebrate and invertebrate species. The group I results help to explain behavioral observations that chemical mixtures of chemosensory stimuli are often more stimulatory than their individual components.
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