title: Expressions of a calcium-binding protein (spot35/calbindin-D28K) in mouse olfactory cells: possible relationship to neuronal differentiation.
abstract: We used immunohistochemistry to investigate the expression of spot35/calbindin-D28k (calbindin) in mouse olfactory epithelium during development. Cell stages of immunopositive olfactory cells were determined by comparing the levels of proliferating cell nuclear antigen (PCNA). Calbindin-positive cells were abundant in the middle layer of the epithelium of animals before 2 weeks of age and gradually diminished during development. Only low levels were detectable near the basement membrane in the adult. Changes of calbindin-positive cells in terms of number and distribution were apparently compatible with localization changes of premature olfactory cells. PCNA overlapped calbindin in the nasal mucosa at lower magnifications on stained serial sections and immunohistochemical double staining revealed that calbindin-immunoreactive cells were located mainly just above PCNA-immunoreactive cells in the basal layer of the epithelium. This indicated that calbindin is expressed postmitotically in immature olfactory cells and is lost by mature cells. These findings suggest that calbindin might support the maturation of the olfactory cells, such as the projection of the neuronal processes, by stabilizing intracellular calcium ions in immature cells.
authors.affiliation: Department of Otorhinolaryngology, Niigata University School of Medicine, Asahi-machi, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Fujiwara
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Kawasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Nakano
authors.forename: R
authors.initials: R
authors.lastname: Kuwano
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D001485:Basement Membrane / Q000166:cytology / Q000378:metabolism; D064092:Calbindin 1; D064026:Calbindins; D002118:Calcium / Q000378:metabolism; D002454:Cell Differentiation; D004847:Epithelial Cells; D004848:Epithelium / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D007150:Immunohistochemistry; D051379:Mice; D008813:Mice, Inbred ICR; D008938:Mitosis; D009297:Nasal Mucosa / Q000166:cytology / Q000294:innervation / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism; D009474:Neurons / Q000166:cytology*; D009831:Olfactory Mucosa / Q000166:cytology / Q000294:innervation* / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D064030:S100 Calcium Binding Protein G / Q000235:genetics* / Q000378:metabolism
chemical_list: C576499:Calb1 protein, mouse; D064092:Calbindin 1; D064026:Calbindins; D009419:Nerve Tissue Proteins; D018809:Proliferating Cell Nuclear Antigen; D064030:S100 Calcium Binding Protein G; D002118:Calcium