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Spatiotemporal expression of ameloblastin isoforms during murine tooth development
Rajeswari M H Ravindranath1, Asokan Devarajan, Takashi Uchida
1Center for Craniofacial Molecular Biology, School of Dentistry, University of Southern California Los Angeles, California 90033, USA. rravindr@usc.edu
The Journal of Biological Chemistry
|October 9, 2007
Summary
The 37 kDa ameloblastin isoform interacts with amelogenin during early mouse molar development, appearing before other isoforms and co-localizing with amelogenin in the enamel matrix.
Area of Science:
- Developmental Biology
- Biochemistry
- Oral Biology
Background:
- Ameloblasts are crucial cells responsible for synthesizing and secreting enamel matrix proteins, including amelogenin, ameloblastin, and enamelin.
- Understanding the temporal and spatial expression of these proteins is vital for comprehending enamel formation and potential developmental defects.
Purpose of the Study:
- To investigate the molecular profiles and localization of ameloblastin during postnatal mouse molar development (days 0-9).
- To determine the relationship between different ameloblastin isoforms and amelogenin during early enamel matrix formation.
Main Methods:
- Utilized an antibody specific to the C-terminal sequence of ameloblastin for analysis.
- Examined ameloblastin expression in both ameloblasts and the enamel matrix across different postnatal days.
- Employed laser scan confocal microscopy and autoradiography to assess co-localization and protein accumulation.
Main Results:
- Ameloblastin was identified in three molecular sizes (37, 55, and 66 kDa) in both ameloblasts and the enamel matrix.
- A 37 kDa ameloblastin isoform was present early (days 0-3), preceding other isoforms and co-localizing with amelogenin in Tomes' process and formative enamel.
- Larger isoforms (55 and 66 kDa) appeared later in ameloblasts and the enamel matrix, peaking around day 5.
Conclusions:
- The 37 kDa ameloblastin isoform plays a distinct role in early tooth development, potentially interacting with amelogenin.
- The differential expression and localization of ameloblastin isoforms suggest complex regulatory mechanisms in enamel matrix formation.
