Abstract：
:Carvone enantiomers (D and L optical isomers) have been shown to be discriminable by humans even though the odor qualities are quite similar. Our experiment is based on a finding (J. Steroid Biochem. Molec. Biol. 1991;39(4B):621) that Concanavalin A (ConA) applied to a frog olfactory epithelium preparation blocks cAMP transduction induced by D- but not by L-carvone. We used standard operant conditioning methods to train animals to discriminate low odor concentrations of D-carvone from clean air, to discriminate L-carvone from clean air; or to discriminate between clean air and the odors of D-carvone, L-carvone, ethyl acetate and methacrylic acid. After perfusion of the nasal cavity with ConA, rats did not respond to D-carvone above or near chance level, while the L-carvone response was not affected at the same or higher ConA doses. However, for rats trained on both enantiomers and the two other unrelated odorants, the D-carvone response remained unaffected by ConA. These results suggest to us that: (1) ConA blocks at least one chiral receptor selective for D-carvone; (2) D-carvone odor quality is modified by ConA so that it is no longer recognized by rats trained on D-carvone only, while rats trained to generalize odors still respond to D-carvone.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Kirner A,Deutsch S,Weiler E,Polak EH,Apfelbach Rdoi
10.1016/s0166-4328(02)00242-5subject
Has Abstractpub_date
2003-01-22 00:00:00pages
201-6issue
2eissn
0166-4328issn
1872-7549pii
S0166432802002425journal_volume
138pub_type
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