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Isolation technique alters eosinophil migration response to IL-8
M D Rozell1, R A Erger, T B Casale
1VA Medical Center, Iowa City, IA, USA.
Journal of Immunological Methods
|October 16, 1996
Summary
Eosinophil chemotaxis to interleukin-8 (IL-8) depends on isolation method. Percoll-isolated eosinophils show chemotaxis, while MACS-isolated eosinophils do not, impacting IL-8 research.
Area of Science:
- Immunology
- Cell Biology
Background:
- Interleukin-8 (IL-8) is a cytokine implicated in eosinophil recruitment.
- Conflicting reports exist regarding IL-8's eosinophil chemotactic capacity.
Purpose of the Study:
- To investigate if eosinophil isolation techniques influence chemotactic responses to IL-8.
- To compare IL-8-induced eosinophil migration using Percoll gradient and magnetic cell separation (MACS) methods.
Main Methods:
- Human eosinophils were isolated using discontinuous Percoll gradients (positive selection) and magnetic cell separation (MACS) (negative selection).
- Chemotaxis assays were performed using IL-8 as a chemoattractant.
- Eosinophil purity, cell surface markers, and potential inhibitors were assessed.
Main Results:
- Percoll-isolated eosinophils exhibited dose-responsive migration to IL-8.
- MACS-isolated eosinophils, despite higher purity and yield, did not migrate to IL-8.
- Further purification of Percoll-isolated eosinophils using CD16 MicroBeads abrogated IL-8 chemotaxis.
Conclusions:
- The method of eosinophil isolation significantly impacts their chemotactic responsiveness to IL-8.
- Percoll isolation may be more suitable for studying eosinophil chemotaxis to IL-8.
- Findings highlight the importance of methodological considerations in immunological research.