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Interleukin-13 is a monocyte chemoattractant
M Magazin1, J C Guillemot, N Vita
1Department of Protein Biochemistry, Sanofi Recherche, Labège, France.
Insights
Recombinant human interleukin-13 (IL-13) attracts monocytes, a key immune cell, through chemotaxis. This cytokine
Area of Science:
- Immunology
- Cell Biology
Background:
- Monocyte migration is crucial for immune responses.
- Interleukins (ILs) are key signaling molecules in immunity.
Purpose of the Study:
- To investigate the role of recombinant human interleukin-13 (IL-13) in monocyte migration.
- To characterize the mechanism of IL-13-mediated chemotaxis.
Main Methods:
- Boyden chamber assays were used to assess monocyte and neutrophil migration.
- Checkerboard experiments distinguished chemotaxis from chemokinesis.
- Inhibition studies involved pertussis toxin and protein kinase inhibitors.
Main Results:
- Recombinant human IL-13 demonstrated chemotactic activity for human peripheral blood monocytes, with optimal migration at 10 ng/ml.
- Migration followed a bell-shaped concentration curve and was confirmed as chemotaxis.
- IL-13-induced monocyte migration was not affected by pertussis toxin but was reduced by protein kinase inhibitors.
- Interleukin-4 (IL-4) showed similar monocyte chemoattractant properties.
- Human IL-13 also attracted rabbit monocytes.
- No neutrophil migration was observed in response to IL-13.
Conclusions:
- Human IL-13 is a potent chemoattractant for monocytes.
- The mechanism involves protein kinase pathways, not pertussis toxin-sensitive pathways.
- IL-13 selectively attracts monocytes and not neutrophils, suggesting specific roles in immune cell recruitment.
Abstract:
Recombinant human IL-13 is chemotactic for purified human peripheral blood monocytes Cell migration is stimulated with a typical bell-shaped concentration curve and is maximal at 10 ng/ml. Migration is the result of chemotaxis, and not chemokinesis, as shown by checkerboard experiments. The chemotactic activity of IL-13 on monocytes is not inhibited by preincubation of the cells with pertussis toxin but is diminished by preincubation with protein kinase inhibitors. The related cytokine, IL-4, also stimulates migration of monocytes in the Boyden chamber assays at concentrations similar to those effective for IL-13. Human IL-13 is capable of attracting rabbit peripheral blood monocytes at those concentrations active on human monocytes. On the other hand, no neutrophil migration was induced by IL-13, even at 1 microM concentrations.