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Mapping the amelogenin protein expression during porcine molar crown development
Xiaohua Dai1, Xiaoli Lian1, Guanhua Wang1
1Tianjin Key Laboratory of Oral and Maxillofacial Function Reconstruction, Tianjin Stomatological Hospital, The Affiliated Stomatological Hospital of Nankai University, Tianjin 300041, China.
Summary
This study reveals amelogenin (AMEL) distribution during porcine tooth crown development. AMEL protein is dynamically expressed in predentin and dentin, aiding mineralization, while absent in newly formed enamel.
Area of Science:
- Developmental biology
- Biochemistry
- Histology
Background:
- Amelogenin (AMEL) is crucial for enamel and dentin formation and mineralization.
- Previous research focused on AMEL expression in early tooth development stages.
- The spatial-temporal distribution of AMEL during mineralization from crypt to completed crown stages was largely unknown.
Purpose of the Study:
- To investigate the distribution pattern of AMEL protein during porcine tooth crown formation.
- To analyze AMEL expression from Nolla Stage 1 to 6, covering mineralization stages.
Main Methods:
- Porcine mandibular molar tooth germs (Nolla Stage 1-6) were analyzed.
- Morphological changes were assessed using X-ray and surgical operating microscopy.
- AMEL protein expression was evaluated via immunohistochemistry, semi-quantitative analysis, and heat mapping.
Main Results:
- Tooth germs showed continuous size increase from Stage 1 to 6.
- AMEL was absent in newly formed enamel but intensely positive in previously formed enamel (Stages 1-3).
- The enamel-dentin junction (EDJ) was consistently strongly positive; AMEL expression in predentin and dentin varied dynamically with mineralization.
Conclusions:
- The study successfully mapped the dynamic distribution of AMEL during porcine tooth crown development.
- Semi-quantitative analysis and heat maps proved effective for visualizing AMEL distribution patterns.
