Isolation and phenotypic characterization of CD117-positive cells

Area of Science:

• Hematology
• Immunology
• Cell Biology

Background:

• Cord blood is a rich source of hematopoietic stem cells.
• Efficient isolation of specific cell populations is crucial for therapeutic applications.
• CD117 is a well-established marker for hematopoietic stem and progenitor cells.

Purpose of the Study:

• To develop and validate a magnetic cell separation (MACS) technique for enriching CD117-expressing mononuclear cells from cord blood.
• To assess the purity and characteristics of the isolated cell population.
• To evaluate the potential of this method for stem cell enrichment in autologous transplantation.

Main Methods:

• Mononuclear cells from cord blood were stained with a CD117-specific antibody conjugated to fluorochrome.
• Cells were further labeled with supermagnetic microparticle-conjugated antibodies.
• Magnetic cell separation (MACS) was employed for cell enrichment.
• Flow cytometry was used to analyze cell phenotype, size, and expression of CD117 and CD34.

Main Results:

• The MACS technique successfully enriched CD117-expressing cells to 96.5% purity.
• Flow cytometry revealed two distinct cell populations based on size.
• A majority of large cells (93%) exhibited a CD117 and CD34 positive phenotype.
• The isolated cell population contained a significant fraction (16%) of hematopoietic progenitors.

Conclusions:

• The described MACS technique provides an effective alternative for stem cell enrichment.
• The high purity of CD117+ and CD34+ cells suggests their potential as hematopoietic progenitors.
• This method may be valuable for autologous transplantation procedures requiring enriched hematopoietic stem cells.