[An improved method for stem cell derivation from human great saphenous vein]

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Vascular Biology

Background:

• Human great saphenous vein is a source of vascular stem cells.
• Current methods for stem cell derivation need optimization for viability and purity.

Purpose of the Study:

• To compare tissue adherence and enzymatic digestion for deriving stem cells from human great saphenous veins.
• To assess the viability, morphology, and stem cell marker expression of derived cells.

Main Methods:

• Human great saphenous vein samples were processed using tissue adherence and enzymatic digestion with type II collagenase.
• Cell morphology, viability (trypan blue staining), and stem cell markers (CD34, CD117 via flow cytometry and immunofluorescence) were analyzed.
• Tube formation assays were performed to assess developmental plasticity.

Main Results:

• Enzymatic digestion yielded significantly higher survival rates (97.2±0.7%) and CD34/CD117 double-positive stem cell rates (0.44±0.07%) compared to tissue adherence (91.7±1.2% and 0.16±0.05%, respectively).
• Cells derived by enzymatic digestion maintained colony-like growth, while tissue-adhered cells showed fibrotic changes and aging.
• Derived stem cells demonstrated developmental plasticity in tube formation assays and lacked significant mature endothelial or smooth muscle cell markers.

Conclusions:

• Enzymatic digestion is a superior method for deriving viable and morphologically healthy vascular stem cells from human great saphenous veins.
• These optimized stem cells possess developmental plasticity and are suitable for broad clinical and basic research applications.