CD43 expression by murine lymphohemopoietic progenitors

Area of Science:

• Hematology
• Immunology
• Cell Biology

Background:

• CD43 is a cell surface glycoprotein expressed on most mature blood cells but not non-hematopoietic cells.
• Defects in CD43 are associated with Wiscott-Aldrich syndrome, highlighting its importance in hematopoietic function.
• Understanding CD43 expression on hematopoietic progenitors is crucial for studying stem cell populations.

Purpose of the Study:

• To investigate CD43 expression patterns on hematopoietic progenitors in normal and 5-fluorouracil (5-FU)-treated mice.
• To determine if CD43 expression can be used to enrich for primitive murine hematopoietic progenitors.
• To evaluate the utility of anti-CD43 antibodies in isolating these progenitor cells.

Main Methods:

• Bone marrow cells were enriched for progenitors using density centrifugation and negative immunomagnetic selection.
• Cells were subsequently separated based on Ly-6A/E and CD43 expression.
• Colony-forming assays were used to identify progenitor populations.

Main Results:

• Approximately 50% of Ly-6A/E+ cells in both normal and 5-FU-treated mice were CD43 negative or low, while the remainder were CD43 bright.
• The majority of colony-forming cells, including lymphohematopoietic progenitors, were found within the Ly-6A/E+CD43bright population.
• The Ly-6A/E+CD43bright cell population showed a 2-fold enrichment for progenitors compared to Ly-6A/E+ cells.

Conclusions:

• CD43 expression is a valuable marker for distinguishing and isolating primitive murine hematopoietic progenitors.
• The combination of Ly-6A/E and CD43 expression effectively enriches for hematopoietic stem and progenitor cells.
• Anti-CD43 antibodies are useful tools for the isolation of primitive hematopoietic progenitors in mice.