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Odorant Receptor Map in the Mouse Olfactory Bulb: In Vivo Sensitivity and Specificity of Receptor-Defined Glomeruli

Oka, Yuki and Katada, Sayako and Omura, Masayo and Suwa, Makiko and Yoshihara, Yoshihiro and Touhara, Kazushige (2006) Odorant Receptor Map in the Mouse Olfactory Bulb: In Vivo Sensitivity and Specificity of Receptor-Defined Glomeruli. Neuron, 52 (5). pp. 857-869. ISSN 0896-6273. doi:10.1016/j.neuron.2006.10.019.

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Odorant identity is represented in the olfactory bulb (OB) by the glomerular activity pattern, which reflects a combination of activated odorant receptors (ORs) in the olfactory epithelium. To elucidate this neuronal circuit at the molecular level, we established a functional OR identification strategy based on glomerular activity by combining in vivo Ca^(2+) imaging, retrograde dye labeling, and single-cell RT-PCR. Spatial and functional mapping of OR-defined glomeruli revealed that the glomerular positional relationship varied considerably between individual animals, resulting in different OR maps in the OB. Notably, OR-defined glomeruli exhibited different ligand spectra and far higher sensitivity compared to the in vitro pharmacological properties of corresponding ORs. Moreover, we found that the olfactory mucus was an important factor in the regulation of in vivo odorant responsiveness. Our results provide a methodology to examine in vivo glomerular responses at the receptor level and further help address the long-standing issues of olfactory sensitivity and specificity under physiological conditions.

Item Type:Article
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URLURL TypeDescription Data
Oka, Yuki0000-0003-2686-0677
Additional Information:© 2006 Elsevier. Received: May 25, 2006. Revised: October 5, 2006. Accepted: October 19, 2006. Published: December 6, 2006. We thank T. Hasegawa Co. Ltd. for odorant compounds, members of K. Mori's lab for advice on the medetomidine anesthesia protocol, N. Uchida for technical advice on olfactory bulb surgery, and Touhara's lab members for support. This work was supported in part by grants from the Program for Promotion of Basic Research Activities for Innovative Biosciences, Japan (PROBRAIN) (to K.T.), Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (to Y.Y. and K.T.), the Japan Society for the Promotion of Science (JSPS) (to Y.O.), and Regional Research and Development Consortium Project (to K.T.).
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Regional Research and Development Consortium ProjectUNSPECIFIED
Subject Keywords:SYSNEURO
Issue or Number:5
Record Number:CaltechAUTHORS:20151118-134438715
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62208
Deposited By: George Porter
Deposited On:18 Nov 2015 23:44
Last Modified:10 Nov 2021 22:59

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