Amelogenin and enamelysin localization in human dental germs

Abstract

Odontogenesis is extensively studied in animal models but less understood in human. In early amelogenesis, amelogenin constitutes 90% of enamel organic matrix, which is degraded by enamelysin and replaced by hydroxyapatite crystals. Here, amelogenin and enamelysin distribution changes during amelogenesis were shown by co-localization experiments by confocal microscopy. Early bell stage showed more amelogenin labeling than enamelysin, as free immune-reactive granular patches towards basal membrane between ameloblast and odontoblast. Increased amelogenin expression and secretion towards extracellular matrix formation region was found. Enamelysin distribution was perinuclear in early bell stage. During late bell stage, a decreasing amelogenin labeling in contrast with enamelysin increasing along the cells was found, suggesting specific temporal amelogenin degradation. Enamelysin was located initially around nuclei and later was found in all the ameloblast and stellate reticulum cytoplasm. Amelogenin was observed inside ameloblast, stellate reticulum, and intermediate stratum cells in the enamel as well as in the newly formed dentin extracellular matrix. In contrast, in dentin more amelogenin than enamelysin was found located close to the periphery.

Design of a controlled release system of OP-1 and TGF-β1 based in microparticles of sodium alginate and release characterization by HPLC-UV

“…The DSP was recognized through Western blot technique with a mouse anti-DSPP, kindly donated by Dr. Larry Fisher of NIDCR Bethesda, MD, USA. Specific polyclonal rabbit anti-DSP was obtained according to Gutiérrez-Cantú et al (2011); the antibody specificity was tested by Western blot.…”