title: Notch receptor expression in neurogenic regions of the adult zebrafish brain.
abstract: The adult zebrash brain has a remarkable constitutive neurogenic capacity. The regulation and maintenance of its adult neurogenic niches are poorly understood. In mammals, Notch signaling is involved in stem cell maintenance both in embryonic and adult CNS. To better understand how Notch signaling is involved in stem cell maintenance during adult neurogenesis in zebrafish we analysed Notch receptor expression in five neurogenic zones of the adult zebrafish brain. Combining proliferation and glial markers we identified several subsets of Notch receptor expressing cells. We found that 90 [Formula: see text] of proliferating radial glia express notch1a, notch1b and notch3. In contrast, the proliferating non-glial populations of the dorsal telencephalon and hypothalamus rarely express notch3 and about half express notch1a/1b. In the non-proliferating radial glia notch3 is the predominant receptor throughout the brain. In the ventral telencephalon and in the mitotic area of the optic tectum, where cells have neuroepithelial properties, notch1a/1b/3 are expressed in most proliferating cells. However, in the cerebellar niche, although progenitors also have neuroepithelial properties, only notch1a/1b are expressed in a high number of PCNA [Formula: see text] cells. In this region notch3 expression is mostly in Bergmann glia and at low levels in few PCNA [Formula: see text] cells. Additionally, we found that in the proliferation zone of the ventral telencephalon, Notch receptors display an apical high to basal low gradient of expression. Notch receptors are also expressed in subpopulations of oligodendrocytes, neurons and endothelial cells. We suggest that the partial regional heterogeneity observed for Notch expression in progenitor cells might be related to the cellular diversity present in each of these neurogenic niches.
authors.affiliation: Biotechnology Center and Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany.
authors.forename: Vanessa
authors.initials: V
authors.lastname: de Oliveira-Carlos
authors.forename: Julia
authors.initials: J
authors.lastname: Ganz
authors.forename: Stefan
authors.initials: S
authors.lastname: Hans
authors.forename: Jan
authors.initials: J
authors.lastname: Kaslin
authors.forename: Michael
authors.initials: M
authors.lastname: Brand
mesh_terms: D000818:Animals; D001921:Brain / Q000166:cytology / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D049109:Cell Proliferation; D015870:Gene Expression; D018507:Gene Expression Regulation, Developmental; D018398:Homeodomain Proteins / Q000235:genetics*; D009419:Nerve Tissue Proteins / Q000235:genetics*; D009457:Neuroglia / Q000166:cytology / Q000378:metabolism; D051881:Receptor, Notch1 / Q000235:genetics*; D000071656:Receptor, Notch3; D051880:Receptors, Notch / Q000235:genetics*; D015027:Zebrafish; D029961:Zebrafish Proteins / Q000235:genetics*
chemical_list: D018398:Homeodomain Proteins; D009419:Nerve Tissue Proteins; C561596:Notch1b protein, zebrafish; C520425:Notch3 protein, zebrafish; D051881:Receptor, Notch1; D000071656:Receptor, Notch3; D051880:Receptors, Notch; D029961:Zebrafish Proteins; C437805:notch1a protein, zebrafish
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