Practical NK cell phenotyping and variability in healthy adults

Area of Science:

• Immunology
• Cell Biology

Background:

• Human natural killer (NK) cells are crucial immune cells with varied surface and intracellular markers reflecting differentiation and effector functions.
• NK cell subsets coexist in peripheral blood, exhibiting significant inter-individual variability.

Purpose of the Study:

• To investigate the diversity of NK cell receptor expression in a normal adult population.
• To analyze the distribution of NK cell subsets and their receptor expression patterns over time within individuals.

Main Methods:

• Peripheral blood mononuclear cells (PBMCs) were analyzed using flow cytometry.
• Fluorochrome-conjugated antibodies targeting various NK cell receptors were employed.
• Analysis included Mean Fluorescence Intensity (MFI) and percentage of positive cells for each receptor, with separate consideration for CD56(bright) and CD56(dim) subsets.

Main Results:

• Established reference ranges for NK cell surface receptor expression in a local adult population.
• Characterized the distribution of CD56(bright) and CD56(dim) NK cell subsets.
• Documented intra-individual variations in NK cell receptor expression over time.

Conclusions:

• NK cell populations exhibit substantial heterogeneity in receptor expression and subset distribution.
• Understanding this variability is essential for interpreting NK cell function in health and disease.
• Provides a baseline for future studies on NK cell dynamics and personalized immunology.