title: Expression of the neuronal calcium sensor protein NCS-1 in the developing mouse olfactory pathway.
abstract: Neuron specific calcium sensor 1 (NCS-1) is widely expressed in the developing and adult nervous system. Like calmodulin, NCS-1 is a member of a family of calcium binding proteins that contain EF-hand motifs, which bind calcium and induce conformational changes in the protein. Their binding varies with calcium concentration, allowing them to act as true calcium sensors rather than just calcium binding proteins. This family of proteins has been implicated in important synaptic events including neurotransmitter release and synapse formation. We examined the expression of NCS-1 in the developing and mature olfactory system to determine whether this molecule may be playing a role in establishing and/or maintaining olfactory circuitry. During development, expression of NCS-1 in the olfactory epithelium was localized in the dendritic knobs and axons of olfactory sensory neurons. Axonal expression was down-regulated after synapse formation. In the developing olfactory bulb, NCS-1 was expressed in the processes of mitral/tufted and granule cells. However, in the adult olfactory bulb, strongest expression was found in a subset of periglomerular cells (PGCs). This subset of PGCs did not express other known markers of PGCs including tyrosine hydroxylase, glutamic acid decarboxylase, calbindin, or calretinin, and only partially overlapped with the subpopulation of PGCs that express parvalbumin. Together, these data suggest multiple and overlapping roles of NCS-1 in the developing and mature olfactory system.
authors.affiliation: Department of Neurosurgery, Yale University School of Medicine, New Haven, Connecticut 06520-8082, USA.
authors.forename: Helen B
authors.initials: HB
authors.lastname: Treloar
authors.forename: Ulyana
authors.initials: U
authors.lastname: Uboha
authors.forename: Andreas
authors.initials: A
authors.lastname: Jeromin
authors.forename: Charles A
authors.initials: CA
authors.lastname: Greer
mesh_terms: D000818:Animals; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005260:Female; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D051580:Neuronal Calcium-Sensor Proteins; D009475:Neurons, Afferent / Q000378:metabolism* / Q000648:ultrastructure; D009479:Neuropeptides / Q000235:genetics / Q000378:metabolism*; D009830:Olfactory Bulb / Q000378:metabolism / Q000648:ultrastructure; D009831:Olfactory Mucosa / Q000196:embryology / Q000378:metabolism* / Q000648:ultrastructure; D009833:Olfactory Pathways / Q000196:embryology* / Q000378:metabolism* / Q000648:ultrastructure; D013569:Synapses / Q000378:metabolism* / Q000648:ultrastructure
chemical_list: D002135:Calcium-Binding Proteins; D051580:Neuronal Calcium-Sensor Proteins; D009479:Neuropeptides; C101464:frequenin calcium sensor proteins