Human monocyte chemotaxis: a quantitative in vivo technique

Area of Science:

• Immunology
• Dermatology
• Cell Biology

Background:

• Monocyte recruitment is crucial in inflammatory and immune responses.
• Existing methods for studying monocyte migration in vivo have limitations in yield and specificity.
• Understanding monocyte function in skin is vital for disease research.

Purpose of the Study:

• To introduce a new quantitative technique for assessing monocyte chemotaxis to epidermal abrasion.
• To overcome limitations of previous skin chamber techniques.
• To provide a reproducible method for studying monocyte behavior in vivo.

Main Methods:

• Utilized micro-acrylic chambers with Zymosan-activated autologous serum placed over epidermal abrasions.
• Employed Nucleopore filters to trap migrating monocytes while allowing neutrophil passage.
• Identified monocytes using alpha-naphthyl acetate esterase activity.

Main Results:

• Monocyte accumulation within filters was observed by 4 hours, peaking at 16-20 hours.
• The technique demonstrated a high yield of specifically identified monocytes.
• The method showed greater reproducibility and avoided attractant generation compared to the Rebuck window.

Conclusions:

• This new technique provides a superior quantitative assessment of monocyte chemotaxis in vivo.
• It is valuable for studying diseases with monocytic infiltrates and comparing blood vs. skin monocytes.
• The method can be used to evaluate the impact of drugs, immunodeficiency, and infection on monocyte function.