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Two populations of stem cells, frequently dividing globose basal cells (GBCs) and quiescent horizontal basal cells (HBCs), readily replace olfactory neurons throughout lifetime. Although lineage commitment and neuronal differentiation of stem cells has already been described in terms of transcription factor expression, little is known about external factors balancing between differentiation and self-renewal. We show here that expression of the CXC-motif chemokine receptor 4 (CXCR4) distinguishes both types of stem cells. Extensive colocalization analysis revealed exclusive expression of CXCR4 in proliferating GBCs and their neuronal progenies. Moreover, only neuronal lineage cells were derived from CXCR4-CreER-tdTomato reporter mice in the OE. Furthermore, Cre-tdTomato mice specific for HBCs (Nestin+ and Cytokeratin14+) did not reduce CXCR4 expression when bred to mice bearing floxed CXCR4 alleles, and did not show labeling of the neuronal cells. CXCR4 and its ligand CXCL12 were markedly upregulated upon induction of GBC proliferation during injury-induced regeneration. in vivo overexpression of CXCL12 did downregulate CXCR4 levels, which results in reduced GBC maintenance and neuronal differentiation. We proved that these effects were caused by CXCR4 downregulation rather than over-activation by showing that the phenotypes of CXCL12-overexpressing mice were highly similar to the phenotypes of CXCR4 knockout mice. Our results demonstrate functional CXCR4 signaling in GBCs regulates cell cycle exit and neural differentiation. We propose that CXCR4\/CXCL12 signaling is an essential regulator of olfactory neurogenesis and provide new insights into the dynamics of neurogenesis in the OE.<\/jats:p>","DOI":"10.1002\/stem.3338","type":"journal-article","created":{"date-parts":[[2021,5,24]],"date-time":"2021-05-24T06:15:42Z","timestamp":1621836942000},"page":"617-635","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Chemokine signaling is required for homeostatic and injury-induced neurogenesis in the olfactory epithelium"],"prefix":"10.1093","volume":"39","author":[{"given":"Katja","family":"Senf","sequence":"first","affiliation":[{"name":"Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"Karius","sequence":"additional","affiliation":[{"name":"Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ralf","family":"Stumm","sequence":"additional","affiliation":[{"name":"Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3363-1231","authenticated-orcid":false,"given":"Eva M.","family":"Neuhaus","sequence":"additional","affiliation":[{"name":"Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2021,1,25]]},"reference":[{"key":"2022022511044407000_stem3338-bib-0001","doi-asserted-by":"crossref","first-page":"979","DOI":"10.1523\/JNEUROSCI.11-04-00979.1991","article-title":"Cell dynamics in the adult mouse olfactory epithelium: a quantitative autoradiographic study","volume":"11","author":"Mackay-Sim","year":"1991","journal-title":"J Neurosci"},{"key":"2022022511044407000_stem3338-bib-0002","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/BF01206454","article-title":"Neurogenesis and neuron regeneration in the olfactory system of mammals. 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