Modification and application of a simple, surface hydrophobicity detection method to immune cells

Area of Science:

• Immunology
• Biophysics
• Cell Biology

Background:

• Cell surface hydrophobicity is a critical parameter influencing cell interactions and functions.
• Assessing immune cell surface properties is vital for understanding immune responses and developing targeted therapies.
• Existing methods for evaluating cell surface hydrophobicity may have limitations in applicability to complex immune cell populations.

Purpose of the Study:

• To investigate and optimize a simple microsphere-based assay for assessing fungal and immune cell surface hydrophobicity.
• To evaluate the influence of various experimental conditions (media, serum, microsphere concentration) on assay performance.
• To determine the applicability of the microsphere assay to different immune cell types, including YAC-1 cells and phagocytic populations.

Main Methods:

• Enumeration of cell-attached polystyrene latex microspheres to quantify cell surface hydrophobicity.
• Systematic investigation of media composition, serum presence, and microsphere concentration effects.
• Application of the optimized assay to YAC-1 cells and phagocytic immune cells.
• Trypsinization experiments to identify hydrophobic surface components.

Main Results:

• Tissue culture media supported microsphere attachment, while serum inhibited it.
• Microsphere concentration significantly impacted the apparent cell surface hydrophobicity.
• The assay detected variations in YAC-1 cell surface hydrophobicity based on harvest time.
• Differences in cell surface hydrophobicity were observed among phagocytic populations.
• Trypsinization indicated that surface proteins contribute to cell hydrophobicity.

Conclusions:

• The microsphere assay provides a reliable and adaptable method for assessing cell surface hydrophobicity in immune cells.
• Experimental conditions, particularly media and serum, must be carefully controlled for accurate hydrophobicity measurements.
• The assay has potential for quantitative determination of surface free energies in immune cells and targets.