Intercellular attachments between calcified collagenous tissue forming cells in the rat

Area of Science:

• Cell Biology
• Biomineralization
• Microscopy Techniques

Background:

• Osteoblasts, cementoblasts, and odontoblasts are crucial for bone and tooth mineralization.
• Understanding intercellular communication is vital for studying mineral matrix formation.
• Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are key tools in cell biology.

Purpose of the Study:

• To investigate the effects of critical point drying on the intercellular contacts of rat osteoblasts, cementoblasts, and odontoblasts.
• To compare the structural integrity of these cell types after preparation for electron microscopy.
• To assess the functional implications of observed structural differences for calcium influx theories.

Main Methods:

• Preparation of young rat osteoblasts, cementoblasts, and odontoblasts using ethanol freeze-fracture.
• Application of critical point drying technique for electron microscopy.
• Analysis using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Main Results:

• Critical point drying induced shrinkage, leading to separation of lateral intercellular contacts in osteoblasts and cementoblasts.
• Intercellular contacts between odontoblasts remained intact after critical point drying.
• Differential shrinkage effects were observed between the studied cell types.

Conclusions:

• The distinct responses of osteoblasts, cementoblasts, and odontoblasts to critical point drying highlight unique structural properties.
• Observed differences in intercellular contact integrity may influence calcium transport mechanisms.
• These findings necessitate consideration of preparation artifacts when developing models of calcium influx into mineralizable matrices.