A method for measuring polymorphonuclear leukocyte concentrations in nasal mucus

Area of Science:

• Immunology
• Cell Biology
• Rhinology

Background:

• Polymorphonuclear leukocytes (PMNs) are key immune cells involved in inflammation.
• Accurate measurement of PMNs in nasal mucus is crucial for understanding upper respiratory tract conditions.
• Existing methods for nasal mucus analysis may have limitations in cell quantification.

Purpose of the Study:

• To develop and validate a reliable method for quantifying PMN concentrations in expelled nasal mucus.
• To establish baseline PMN levels in healthy individuals.
• To assess the feasibility of using this method for studying nasal inflammatory diseases.

Main Methods:

• Nasal mucus samples (0.05-0.15 ml) were collected and diluted 1:60 in Hank's balanced salt solution.
• Diluted samples underwent vigorous agitation to ensure cell dispersion.
• Cells were counted using a hemocytometer to determine PMN concentration.

Main Results:

• The mean PMN concentration in healthy young adults was determined to be 7.1 x 10^6 PMNs/ml of mucus.
• Significant daily variations in PMN counts were observed within the same individuals.
• The developed method demonstrated consistent cell counting within sample replicates.

Conclusions:

• A straightforward method for measuring PMN concentrations in nasal mucus has been established.
• The findings highlight the dynamic nature of PMN levels in the nasal cavity.
• This technique offers a valuable tool for investigating inflammatory conditions affecting the nose.