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Bicarbonate Transport During Enamel Maturation
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Journal Article
Bicarbonate Transport During Enamel Maturation
2017
Overview
Amelogenesis (tooth enamel formation) is a biomineralization process consisting primarily of two stages (secretory stage and maturation stage) with unique features. During the secretory stage, the inner epithelium of the enamel organ (i.e., the ameloblast cells) synthesizes and secretes enamel matrix proteins (EMPs) into the enamel space. The protein-rich enamel matrix forms a highly organized architecture in a pH-neutral microenvironment. As amelogenesis transitions to maturation stage, EMPs are degraded and internalized by ameloblasts through endosomal–lysosomal pathways. Enamel crystallite formation is initiated early in the secretory stage, however, during maturation stage the more rapid deposition of calcium and phosphate into the enamel space results in a rapid expansion of crystallite length and mineral volume. During maturation-stage amelogenesis, the pH value of enamel varies considerably from slightly above neutral to acidic. Extracellular acid–base balance during enamel maturation is tightly controlled by ameloblast-mediated regulatory networks, which include significant synthesis and movement of bicarbonate ions from both the enamel papillary layer cells and ameloblasts. In this review we summarize the carbonic anhydrases and the carbonate transporters/exchangers involved in pH regulation in maturation-stage amelogenesis. Proteins that have been shown to be instrumental in this process include CA2, CA6, CFTR, AE2, NBCe1, SLC26A1/SAT1, SLC26A3/DRA, SLC26A4/PDS, SLC26A6/PAT1, and SLC26A7/SUT2. In addition, we discuss the association of miRNA regulation with bicarbonate transport in tooth enamel formation.
Publisher
Springer US,Springer Nature B.V
Subject
/ Animals
/ Anion Transport Proteins - metabolism
/ Biomedical and Life Sciences
/ Carbonic Anhydrases - metabolism
/ Chloride-Bicarbonate Antiporters - metabolism
/ Cystic Fibrosis Transmembrane Conductance Regulator - metabolism
/ Dental Enamel - growth & development
/ Enamel
/ Humans
/ miRNA
/ Review
/ Sodium-Bicarbonate Symporters - metabolism
/ Teeth
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