Differential response of human basophil activation markers: a multi-parameter flow cytometry approach

Area of Science:

• Immunology
• Cell Biology
• Allergy Research

Background:

• Basophils are key in hypersensitivity and allergic reactions.
• Basophil activation mechanisms and sensitivities require further investigation.
• Polychromatic flow cytometry (PFC) is suitable for studying basophil function and membrane marker expression.

Purpose of the Study:

• To investigate human basophil activation using PFC.
• To evaluate the expression of membrane markers upon stimulation.
• To compare the sensitivity of different activation markers.

Main Methods:

• Basophils were purified from blood using PFC gating strategies (CD45dim, HLADRnon/CD123bright).
• Activation was induced using fMLP, anti-IgE, and calcium ionophore A23187.
• Upregulation of membrane markers (CD63, CD13, CD45, CD203c, CD69) was analyzed via PFC.

Main Results:

• CD63, CD13, CD45, and CD203c expression increased post-stimulation; CD69 did not.
• CD63 upregulation was rapid but limited to a subset of basophils.
• CD203c upregulation occurred in the entire basophil population and was more sensitive to fMLP than CD63.

Conclusions:

• PFC enables efficient basophil purification and analysis of activation markers.
• Simultaneous use of multiple markers and appropriate activator selection are crucial for accurate basophil function assessment.
• CD203c shows promise as a sensitive marker for basophil activation studies.