A modified 'low pH' lignocaine method to isolate human monocytes: a comparison with other separation procedures

Area of Science:

• Immunology
• Cell Biology

Background:

• Monocyte isolation is crucial for immunological research.
• Traditional adherence methods can affect monocyte function.

Purpose of the Study:

• To introduce and evaluate a modified 'low pH' lignocaine method for human monocyte recovery.
• To compare this method with existing adherence separation techniques.

Main Methods:

• Human monocytes were isolated using the 'low pH' lignocaine method and compared with mechanical scraping, microexudate-coated plastic, and fetal calf serum (FCS) pretreatment.
• Isolated monocytes were characterized by morphological and functional assays, including esterase staining, lymphocyte contamination, viability, adherence, neutral red uptake, phagocytosis, mobility, chemotaxis, and tumoricidal activity.

Main Results:

• The 'low pH' lignocaine method provides a simple and reproducible technique for isolating human monocytes.
• This method yields viable, pure, and functionally intact monocytes.
• It avoids the need for preconditioned plastics, unlike other adherence procedures.

Conclusions:

• The 'low pH' lignocaine method is a superior technique for human monocyte isolation compared to other adherence procedures.
• This method ensures high-quality monocytes for immunological studies.