Three-dimensional Imaging Reveals New Compartments and Structural Adaptations in Odontoblasts.

Area of Science:

• Cell Biology
• Dental Anatomy
• Neuroscience

Background:

• Precise cell geometry is crucial for tissue function.
• Odontoblasts are key tooth matrix producers and potential sensory cells.
• Limited morphologic data hinders understanding of odontoblast function.

Purpose of the Study:

• To visualize and reconstruct 3D morphology of odontoblasts and pulp cells.
• To identify distinct structural features and compartments of odontoblasts.
• To investigate cellular contacts and ion channel expression in odontoblasts.

Main Methods:

• Fluorescent color-coding genetic tracing in mouse incisors.
• 3D reconstruction of single cells and cell assemblages.
• Analysis of cellular shape, process formation, orientation, and matrix deposition.

Main Results:

• Detailed 3D reconstructions revealed distinct odontoblast structures across maturation stages.
• Previously unknown contacts between pulp cell and odontoblast processes were identified.
• Odontoblasts express TRPM5 and Piezo2 ion channels, with TRPM5 showing asymmetric distribution.

Conclusions:

• Refined 3D morphologic data enhances understanding of odontoblast cellular functions.
• Identified cellular contacts suggest novel roles in tooth physiology.
• TRPM5 and Piezo2 expression patterns offer insights into odontoblast sensory roles.