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Previous Article | Next Article
The Journal of Neuroscience, June 15, 1998, 18(12):4560-4569
Odorant Response Properties of Convergent Olfactory Receptor Neurons
Thomas C. Bozza and John S. Kauer Department of Neuroscience, Tufts University School of Medicine, Boston, Massachusetts 02111
Information about odorant stimuli is thought to be represented in spatial and temporal patterns of activity across neurons in the olfactory epithelium and the olfactory bulb (OB). Previous studies suggest that olfactory receptor neurons (ORNs) distributed in the nasal cavity project to localized regions in the glomerular layer of the OB. However, the functional significance of this convergence is not yet known, and in no studies have the odorant response properties of individual ORNs projecting to defined OB regions been measured directly. We have retrogradely labeled mouse ORNs connecting to different glomeruli in the dorsal OB and tested single cells for responses to odorants using fura-2 calcium imaging. ORNs that project to clusters of dorsomedial (DM) glomeruli exhibit different odorant response profiles from those that project to dorsolateral (DL) glomeruli. DL-projecting ORNs showed responses to compounds with widely different structures, including carvone, eugenol, cinnamaldehyde, and acetophenone. In contrast, DM-projecting neurons exhibited responses to a more structurally restricted set of compounds and responded preferentially to organic acids. These data demonstrate that ORN afferents segregate by odorant responsiveness and that the homogeneity of ORN and glomerular input varies with different OB regions. The data also demonstrate that a subpopulation of ORNs projecting to DM glomeruli is functionally similar.
Key words: olfactory receptor neurons; olfactory bulb; calcium; imaging; retrograde tracing; glomeruli; mouse; olfactory coding
Copyright © 1998 Society for Neuroscience 0270-6474/98/18124560-10$05.00/0
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