PMID- 17123719 OWN - NLM STAT- MEDLINE DCOM- 20070330 LR - 20131121 IS - 0304-3940 (Print) IS - 0304-3940 (Linking) VI - 411 IP - 3 DP - 2007 Jan 16 TI - Distribution of Notch1-expressing cells and proliferating cells in mouse vomeronasal organ. PG - 217-21 AB - Vomeronasal receptor neurons (VRNs) proliferate and differentiate continuously in the vomeronasal organ (VNO) throughout life. In adult mice, new VRNs are generated mainly in the marginal region, located in the boundary region between sensory and nonsensory epithelia. The Notch signaling pathway is involved in differentiation in the developing nervous system. To understand the Notch signaling pathway involved in generating VRNs, we focused on the relationship between the expression pattern of Notch1 and the localization of proliferating cells in both developing and regenerating mice VNO, and examined the Notch signaling pathway involved in the development of VNO by in situ hybridization of Notch1 and immunocytochemistry of 5-bromo-2'-deoxyuridine. During embryonic and neonatal development, proliferating cells and Notch1-expressing (+) cells were observed evenly throughout VNO. A large number of proliferating cells and Notch1 (+) cells were observed in embryonic VNO, but gradually decreased during development. The localization of proliferating cells was similar to that of Notch1 (+) cells at each developmental stage. In adult VNO, there are a few proliferating cells and Notch1 (+) cells, which were only in the marginal region of VNO. Seven days after removal of the accessory olfactory bulb (AOB), VRNs proliferated throughout VNO. Although the number of Notch1 (+) cells also increased in VNO, the majority of these were concentrated in the dorsal region of VNO, suggesting that it has two types of differentiating cell. These results suggest that Notch1 plays a role in the differentiation of VRNs during development and regeneration of VRNs after removal of AOB. FAU - Wakabayashi, Yoshihiro AU - Wakabayashi Y AD - Laboratory of Anatomy and Cell Biology, Department of Neuroscience Basic Technology, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashidai, Fuchu, Tokyo 183-8526, Japan. ywaka@tmin.ac.jp FAU - Ichikawa, Masumi AU - Ichikawa M LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20061122 PL - Ireland TA - Neurosci Lett JT - Neuroscience letters JID - 7600130 RN - 0 (Notch1 protein, mouse) RN - 0 (Receptor, Notch1) RN - G34N38R2N1 (Bromodeoxyuridine) SB - IM MH - Animals MH - Animals, Newborn MH - Bromodeoxyuridine/metabolism MH - *Cell Proliferation MH - Embryo, Mammalian MH - Gene Expression Regulation, Developmental/*physiology MH - Mice MH - Neurons/*cytology/metabolism/physiology MH - Receptor, Notch1/genetics/*metabolism MH - Reverse Transcriptase Polymerase Chain Reaction/methods MH - Vomeronasal Organ/*cytology/embryology/growth & development EDAT- 2006/11/25 09:00 MHDA- 2007/03/31 09:00 CRDT- 2006/11/25 09:00 PHST- 2006/06/24 00:00 [received] PHST- 2006/09/12 00:00 [revised] PHST- 2006/09/15 00:00 [accepted] PHST- 2006/11/25 09:00 [pubmed] PHST- 2007/03/31 09:00 [medline] PHST- 2006/11/25 09:00 [entrez] AID - S0304-3940(06)00994-3 [pii] AID - 10.1016/j.neulet.2006.09.088 [doi] PST - ppublish SO - Neurosci Lett. 2007 Jan 16;411(3):217-21. doi: 10.1016/j.neulet.2006.09.088. Epub 2006 Nov 22.