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Maegawa A, Murata K, Kuroda K, Fujieda S, Fukazawa Y. Cellular Profiles of Prodynorphin and Preproenkephalin mRNA-Expressing Neurons in the Anterior Olfactory Tubercle of Mice. Front Neural Circuits 2022; 16:908964. [PMID: 35937204 PMCID: PMC9352893 DOI: 10.3389/fncir.2022.908964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/10/2022] [Indexed: 11/13/2022] Open
Abstract
The olfactory tubercle (OT) is a striatal region that receives olfactory inputs. mRNAs of prodynorphin (Pdyn) and preproenkephalin (Penk), precursors of dynorphins and enkephalins, respectively, are strongly expressed in the striatum. Both produce opioid peptides with various physiological effects such as pain relief and euphoria. Recent studies have revealed that OT has anatomical and cytoarchitectonic domains that play different roles in odor-induced motivated behavior. Neuronal subtypes of the OT can be distinguished by their expression of the dopamine receptors D1 (Drd1) and D2 (Drd2). Here, we addressed whether and which type of opioid peptide precursors the D1- and D2-expressing neurons in the OT express. We used multiple fluorescence in situ hybridization for mRNAs of the opioid precursors and dopamine receptors to characterize mouse OT neurons. Pdyn was mainly expressed by Drd1-expressing cells in the dense cell layer (DCL) of the OT, whereas Penk was expressed primarily by Drd2-expressing cells in the DCL. We also confirmed the presence of a larger population of Pdyn-Penk-Drd1 co-expressing cells in the DCL of the anteromedial OT compared with the anterolateral OT. These observations will help understand whether and how dynorphins and enkephalins in the OT are involved in diverse odor-induced motivated behaviors.
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Affiliation(s)
- Ayako Maegawa
- Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- Division of Brain Structure and Function, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Koshi Murata
- Division of Brain Structure and Function, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- Life Science Innovation Center, Faculty of Medical Science, University of Fukui, Fukui, Japan
- *Correspondence: Koshi Murata
| | - Kazuki Kuroda
- Division of Brain Structure and Function, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- Life Science Innovation Center, Faculty of Medical Science, University of Fukui, Fukui, Japan
| | - Shigeharu Fujieda
- Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- Shigeharu Fujieda
| | - Yugo Fukazawa
- Division of Brain Structure and Function, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- Life Science Innovation Center, Faculty of Medical Science, University of Fukui, Fukui, Japan
- Research Center for Child Mental Health Development, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- Yugo Fukazawa
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