Multiple stem cell traits of expanded rat bone marrow stromal cells.

Area of Science:

• Cell Biology
• Stem Cell Research
• Tissue Engineering

Background:

• Bone marrow stromal cells (BMSC) possess stem cell characteristics, including self-renewal, proliferation, and differentiation.
• The impact of cell expansion time on BMSC stemness remains an area of investigation.

Purpose of the Study:

• To compare the stem cell potential of early (2nd passage) and late (10th passage) cultured BMSC.
• To evaluate differences in morphology, proliferation, apoptosis, and multi-lineage differentiation capacity.

Main Methods:

• Cultured BMSC at 2nd and 10th passages were analyzed.
• Morphological characteristics and BMSC-related antigen expression (CD90, CD73) were assessed.
• Cell proliferative capacity and apoptosis rates were measured.
• Differentiation potential into mesodermal (osteocytes, adipocytes) and ectodermal (neurons) lineages was evaluated.

Main Results:

• 10th passage BMSC displayed altered morphology and reduced expression of BMSC-related antigens compared to 2nd passage cells.
• 2nd passage BMSC exhibited approximately double the proliferative capacity and lower apoptosis rates than 10th passage BMSC.
• Early passage BMSC demonstrated more effective differentiation into osteocytes, adipocytes, and neurons.

Conclusions:

• BMSC stem cell potential, including proliferation and differentiation, diminishes with increased passage number.
• Early passage BMSC are a more suitable cell source for in vitro applications and cell therapy.
• Expansion time is a critical factor influencing BMSC characteristics and therapeutic utility.