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Signal transduction during in vitro lymphocyte homing
R Renkonen1, A Mennander, P Mattila
1Department of Bacteriology and Immunology, University of Helsinki, Finland.
Human Immunology
|June 1, 1990
Summary
Interferon gamma enhances lymphocyte binding to endothelial cells via protein kinase C and calcium signaling. Platelet activating factor and interleukin-1 alpha also boost lymphocyte adhesion through distinct intracellular pathways.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Lymphocyte homing to tissues requires binding to endothelial cells.
- This binding is mediated by specific ligand-receptor interactions.
- Understanding the signaling pathways involved is crucial for immune response modulation.
Purpose of the Study:
- To investigate the intracellular signaling pathways regulating lymphocyte-endothelial cell adhesion.
- To determine the role of protein kinase C, calcium, and cAMP in this process.
- To compare the effects of different inflammatory mediators on lymphocyte binding.
Main Methods:
- Endothelial cell cultures were treated with interferon gamma, platelet activating factor, and interleukin-1 alpha.
- Intracellular signaling pathways (protein kinase C, calcium, cAMP) were analyzed.
- Lymphocyte binding assays were performed to quantify adhesion.
Main Results:
- Interferon gamma-induced upregulation of intercellular adhesion molecule 1 (ICAM-1) is dependent on protein kinase C and calcium.
- Platelet activating factor rapidly enhanced lymphocyte binding via protein kinase C.
- Interleukin-1 alpha increased lymphocyte binding over a longer period, involving cAMP signaling.
Conclusions:
- Different inflammatory mediators utilize distinct signal transduction pathways.
- These diverse pathways converge to enhance lymphocyte-endothelial cell binding.
- This highlights the complexity of immune cell trafficking regulation.