Leukocyte membrane markers on cell populations defined by six flow cytometric bitmaps

Area of Science:

• Immunology
• Hematology
• Flow Cytometry

Background:

• Leukocyte differentiation and distribution vary across different physiological and pathological states.
• Accurate identification of leukocyte subsets is crucial for diagnosing and monitoring various conditions.
• Flow cytometry is a key technique for analyzing cell populations based on surface markers and physical properties.

Purpose of the Study:

• To analyze cell membrane marker proportions in peripheral blood from healthy adults, children, and bone marrow transplant recipients.
• To evaluate the utility and reproducibility of six commonly used cell gates in flow cytometric analysis.
• To assess the impact of different sample groups on marker-positive cell frequencies.

Main Methods:

• Peripheral blood samples were obtained from healthy adults, children, and bone marrow transplant patients.
• Cells were stained for CD2, CD4, CD8, CD19, CD56, CDw65, and KiM8 cell membrane markers.
• Six distinct cell gates (large lymphocytic, small lymphocytic, monocytic, mononuclear, granulocytic, all-cell) were defined based on granularity and cell size (L90 degrees LSx-FALS).
• Marker-positive cell proportions were quantified within each defined gate.

Main Results:

• Significant differences in marker-positive cell proportions were observed between healthy adults, children, and bone marrow transplant patients.
• Marker frequencies generally corresponded to the known biologic distribution of leukocyte populations.
• Despite variations in gate placement and cell counts, the six defined gates yielded reproducible data.
• Large and small lymphocytic gates showed similar marker frequencies, suggesting a smaller lymphocytic gate can be used to avoid monocyte contamination when populations are not clearly delineated.

Conclusions:

• Flow cytometry gating strategies can be precisely defined and yield reproducible results for analyzing leukocyte subsets.
• Distinct differences in cell marker profiles exist across healthy adults, children, and bone marrow transplant recipients.
• The defined gating approach is robust and applicable for differentiating leukocyte populations in diverse clinical contexts.