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Chemiluminescence and chemotaxis assay of porcine polymorphonuclear cells. A methodological study
1Department of Medicine and Surgery, Veterinary Faculty, University of Agricultural Sciences, Uppsala, Sweden.
Abstract:
A Boyden-Chamber technique for leukocyte migration was adapted to a polymorphonuclear (PMN) cell concentration of 5 x 10(6) cells/ml an optimal amount of cells for the leading front technique. Casein (0.1%) is so far the most effective chemotactic substance for porcine granulocytes. A formylpeptide++, FMLP (in concentrations of 10(-2) to 10(-10) mmol/l), does not stimulate migration in porcine granulocytes when compared to random migration. For the chemiluminescence assay a concentration of 5 x 10(6) PMN cells/ml buffer is needed to obtain optimal conditions in pig granulocytes. Moreover the chemiluminescence should be performed within a standardized interval after the isolation of leukocytes since the cell activity declines rapidly after the isolation. The chemiluminescence and migration assays were standardized at 37 degrees C; the activity of the granulocytes did not show any significant variation within a temperature interval of 37-39 degrees C, whereas temperatures below 37 degrees C significantly reduce the granulocytic activity.
Insights
This study optimized techniques for analyzing porcine granulocyte (PMN) function. Casein effectively stimulates migration, while FMLP does not, and assays require specific cell concentrations and temperatures for accurate results.
Area of Science:
- Immunology
- Cell Biology
- Veterinary Medicine
Background:
- Accurate assessment of polymorphonuclear (PMN) cell function is crucial in immunological studies.
- Standardized methods are needed for reliable analysis of leukocyte migration and chemiluminescence in porcine models.
Purpose of the Study:
- To adapt and standardize the Boyden-Chamber technique for porcine granulocyte migration assays.
- To evaluate the efficacy of different chemotactic substances and optimize conditions for chemiluminescence assays in pig granulocytes.
Main Methods:
- Adapted Boyden-Chamber technique for leukocyte migration using a polymorphonuclear (PMN) cell concentration of 5 x 10(6) cells/ml.
- Tested casein (0.1%) and FMLP (formylpeptide) as chemotactic agents for porcine granulocytes.
- Standardized chemiluminescence assays at 5 x 10(6) PMN cells/ml buffer and specific time intervals post-isolation.
Main Results:
- Casein (0.1%) was identified as the most effective chemotactic substance for porcine granulocytes.
- FMLP did not stimulate migration in porcine granulocytes compared to random migration.
- Optimal conditions for chemiluminescence assays required 5 x 10(6) PMN cells/ml buffer and prompt analysis post-isolation.
- Granulocyte activity was stable between 37-39 degrees C, but significantly reduced below 37 degrees C.
Conclusions:
- Established optimized parameters for porcine granulocyte migration and chemiluminescence assays.
- Highlighted the importance of standardized cell concentrations, temperature (37°C), and timely sample processing for reliable results.
- Identified casein as a potent chemoattractant for porcine granulocytes, while FMLP showed no significant effect.