Random monocyte migration: an in vitro correlation with the delayed hypersensitivity skin reaction

Area of Science:

• Immunology
• Cellular Biology

Background:

• Delayed-type hypersensitivity (DTH) is a critical immune response.
• Monocytes and neutrophils are key immune cells involved in inflammation and DTH.
• Understanding the relationship between in vitro cell function and in vivo immune responses is important for diagnostics and therapeutics.

Purpose of the Study:

• To compare the in vitro random migration and chemotactic activity of peripheral blood monocytes and neutrophils with in vivo delayed hypersensitivity skin test responses.
• To investigate the correlation between cellular immune cell mobility and DTH reactions.

Main Methods:

• Peripheral blood monocytes and neutrophils were isolated from fourteen normal subjects.
• In vitro random migration and chemotactic assays were performed on these cells.
• The in vitro results were compared with the size of the delayed hypersensitivity skin test reaction to streptokinase-streptodornase.

Main Results:

• A significant positive correlation (P < 0.001) was found between the random migration of monocytes and the size of the DTH skin test reaction.
• No significant correlation was observed between random neutrophil migration and DTH skin test size.
• Neither monocyte nor neutrophil chemotactic responses showed a significant correlation with the DTH skin test results.

Conclusions:

• In vitro random mobility of monocytes is associated with the in vivo expression of delayed-type hypersensitivity skin reactions.
• Monocyte random migration may serve as a potential indicator of cellular immune responsiveness in DTH.
• Neutrophil migration and chemotaxis do not appear to be directly correlated with this specific DTH skin test response.