The dental pulp stem cell niche based on aldehyde dehydrogenase 1 expression

Area of Science:

• Dental stem cell research
• Tissue engineering
• Regenerative medicine

Background:

• Dental pulp harbors stem cells with regenerative potential.
• Identifying specific markers is crucial for isolating and characterizing these cells.

Purpose of the Study:

• To detect aldehyde dehydrogenase 1 (ALDH1) expression in human dental pulp.
• To investigate ALDH1's role as a marker for dental pulp stem cells (DPSCs).

Main Methods:

• Immunohistochemistry to locate ALDH1, STRO-1, and CD90 positive cells in pulp tissue.
• Flow cytometry to analyze ALDH1 activity and cell surface markers (CD44, CD73, CD90, STRO-1, CD45) in isolated cells.
• Assessment of multidifferentiation capacity of isolated cells and an ALDH1 positive subpopulation.

Main Results:

• ALDH1, CD90, and STRO-1 positive cells were found near blood vessels and nerve fibers in dental pulps.
• Isolated dental pulp cells expressed CD44, CD73, CD90, and showed moderate STRO-1 and ALDH1 labeling.
• Cells demonstrated osteogenic, adipogenic, and chondrogenic differentiation potential, including the ALDH1 positive subpopulation.

Conclusions:

• Dental pulp stem cells are located perivascularly and near nerve fibers, suggesting multiple stem cell niches.
• ALDH1 is expressed in isolated dental pulp cells exhibiting mesenchymal stem cell properties.
• ALDH1 shows promise as a marker for identifying dental pulp stem cells (DPSCs).