title: Dentin-specific proteins in MDPC-23 cell line.
abstract: Only four established odontoblast-like cell lines have been reported in the literature (1-6). Of the four, only two synthesize dentin-specific proteins. These studies report that the cell line MO6-G3 synthesizes phosphophoryn (DPP), dentin sialoprotein (DSP) and dentin matrix protein-1 (DMP-1) while MDPC-23 synthesizes DSP, but not DMP-1. The objective of the present study was to determine whether polyclonal antibodies to rat DSP and DPP would label odontoblasts on microscopic sections of day-19 fetal mouse incisor odontoblasts as well as cultured cells of the MDPC-23 cell line. The spontaneously immortalized MDPC-23 cell line was derived from fetal mouse molar papillae, made continuous by the 3T6 method and cloned by dilution. These cultures have been passaged 77 times after cloning, form multilayered nodules, and have high alkaline phosphatase activity. The data show positive reactivity in odontoblasts in 19-d mouse fetal incisors as well as in cultures of MDPC-23 cells by fluorescence and confocal microscopy. In addition, these cultures were characterized by phase microscopy and scanning and transmission electron microscopy. These findings suggest that MDPC-23 cells are of the odontoblast lineage.
authors.affiliation: University of Michigan, Ann Arbor 48109-1078, USA. thanks@umich.edu
authors.forename: C T
authors.initials: CT
authors.lastname: Hanks
authors.forename: D
authors.initials: D
authors.lastname: Fang
authors.forename: Z
authors.initials: Z
authors.lastname: Sun
authors.forename: C A
authors.initials: CA
authors.lastname: Edwards
authors.forename: W T
authors.initials: WT
authors.lastname: Butler
mesh_terms: D000818:Animals; D002460:Cell Line; D003771:Dental Papilla / Q000166:cytology / Q000378:metabolism; D003804:Dentin / Q000378:metabolism*; D016326:Extracellular Matrix Proteins; D016650:Fluorescein-5-isothiocyanate; D005455:Fluorescent Antibody Technique; D051379:Mice; D009804:Odontoblasts / Q000166:cytology* / Q000378:metabolism*; D010750:Phosphoproteins / Q000378:metabolism; D011498:Protein Precursors; D011506:Proteins / Q000378:metabolism*; D051381:Rats; D012795:Sialoglycoproteins / Q000378:metabolism; D000099311:Dentin Sialophosphoprotein
chemical_list: D016326:Extracellular Matrix Proteins; D016650:Fluorescein-5-isothiocyanate; D010750:Phosphoproteins; D011498:Protein Precursors; D011506:Proteins; D012795:Sialoglycoproteins; D000099311:Dentin Sialophosphoprotein; C513308:Dmp1 protein, mouse; C081635:Dmp1 protein, rat; C017630:phosphophoryn