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Chemical Senses 21: 519-527,
© 1996

research-article

Electrophysiological Evidence for the Broad Distribution of Specific Odorant Receptor Molecules across the Olfactory Organ of the Channel Catfish

Qinhui Chang1 and John Caprio

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

Correspondence to be sent to: J. Caprio, Department of Zoology and Physiology, Louisiana State University, Baton Rouge, LA 70803-1725, USA

To determine if there is a spatial segregation of responsiveness to odorants within the olfactory epithelium, microelectrode recordings were obtained from small populations of olfactory receptor neurons located across different lamellar sensory regions of the olfactory organ of the channel catfish, lctalurus punctatus. Stimuli included L-alanine, L-methionine, L-arginine hydrochloride, L-glutamic acid, ATP and a mixture of bile salts—odorants previously reported to stimulate independent receptor sites in aquatic species. The peak integrated olfactory receptor responses at each recording site were standardized to the response to L-alanine. The relative stimulatory effectiveness of the stimuli was preserved across the 10 olfactory lamellae recording sites. These data support previous molecular biological results of a broad distribution of receptor neurons that express specific receptor genes across the olfactory organ of the channel catfish. Chem. Senses 21: 519-527, 1996.

1Present address: Institute of Cognitive and Computational Sciences Georgetown University Medical Center, Washington, DC 20007, USA


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