Immortalized mouse odontoblast cell line MO6-G3 application for in vitro biocompatibility testing

Area of Science:

• Biomaterials Science
• Dental Materials
• Cell Biology

Background:

• Dental materials require rigorous biocompatibility testing.
• Current testing often uses fibroblastic cell lines, which may not accurately reflect odontoblast responses.
• Immortalized odontoblast cell lines offer a promising alternative for more relevant in vitro assessments.

Purpose of the Study:

• To evaluate the suitability of the immortalized mouse odontoblast cell line (MO6-G3) for dental material biocompatibility testing.
• To compare the cytotoxic response of MO6-G3 cells to the standard L929 fibroblast cell line when exposed to a dental resin monomer.
• To assess the impact of TEGDMA on cell respiratory activity and recovery.

Main Methods:

• Utilized a standard cytotoxicity assay measuring cell respiratory activity via WST-1.
• Exposed MO6-G3 and L929 cell lines to varying concentrations of TEGDMA (1 x 10(-6) to 0.5 x 10(-3) M).
• Assessed cell viability and recovery after 24 hours of exposure and 48 hours post-exposure.

Main Results:

• TEGDMA demonstrated toxicity to MO6-G3 cells at 1 x 10(-5) M, while L929 cells showed no toxic effects across the tested range.
• MO6-G3 cells exposed to higher TEGDMA concentrations (0.5 x 10(-3) M) had impaired recovery.
• Significant recovery of respiratory activity was observed in MO6-G3 cells at lower TEGDMA concentrations (1 x 10(-4) M and 0.5 x 10(-4) M) after resin removal.

Conclusions:

• The MO6-G3 cell line is a sensitive model for detecting the cytotoxicity of dental resin monomers like TEGDMA.
• MO6-G3 cells provide a more relevant response for dental material biocompatibility testing compared to L929 fibroblasts.
• This study supports the use of MO6-G3 cells for more accurate in vitro assessment of dental material safety.