title: High-Dose Fluoride Induces Apoptosis and Inhibits Ameloblastin Secretion in Primary Rat Ameloblast.
abstract: The objectives of this study are to establish the in vitro culture system for rat primary ameloblast and to investigate the effects of fluoride on cell viability, apoptosis, and ameloblastin (AMBN) secretion of primary rat ameloblast in vitro. Ameloblast was isolated from the tooth germ of the maxillomandibular molar and cultured in vitro. Cells were treated with NaF at 0.4, 0.8, 1.6, 3.2, and 6.4 mM for 24, 48, and 72 h, respectively. Cell viability was measured by MTT assay and apoptosis was tested by flow cytometry. The activation of Fas ligand (FasL)/Fas pathway was detected using immunoblotting for FasL, Fas, cleaved caspase-8, cleaved caspase-3, and cleaved PARP. Secretion of AMBN in culture medium was measured using ELISA. Primary rat ameloblast was successfully isolated and cultured. The effects of low-dose fluoride on cell viability were bi-phasic, while high-dose fluoride resulted in decreased cell viability uniformly. Fluoride induced ameloblast apoptosis via activation of FasL/Fas signaling pathway and diminished secretion of AMBN by ameloblast. Fluoride could decrease ameloblast viability, induce ameloblast apoptosis via activating FasL/Fas signaling pathway, and reduce AMBN secretion.
authors.affiliation: Department of Stomatology, Xi'an Medical University, No. 1, XinWang Road, WeiYang District, Xi'an, 710021, China. missing412@163.com.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Stomatology, Xi'an Medical University, No. 1, XinWang Road, WeiYang District, Xi'an, 710021, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Department of Stomatology, Xi'an Medical University, No. 1, XinWang Road, WeiYang District, Xi'an, 710021, China.
authors.forename: Danyang
authors.initials: D
authors.lastname: Wang
mesh_terms: D000565:Ameloblasts / Q000378:metabolism*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002478:Cells, Cultured; D003746:Dental Enamel Proteins / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D053222:Fas Ligand Protein / Q000378:metabolism; D005459:Fluorides / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction / Q000187:drug effects*; D019014:fas Receptor / Q000378:metabolism
chemical_list: C098519:Ambn protein, rat; D003746:Dental Enamel Proteins; D053222:Fas Ligand Protein; C491898:Fas protein, rat; C505662:Faslg protein, rat; D019014:fas Receptor; D005459:Fluorides
keywords: Ameloblast; Ameloblastin; FasL/Fas; Fluoride; Primary culture