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Distinct signaling pathways for MCP-1-dependent integrin activation and chemotaxis
1Department of Geriatric Medicine, Kyoto University Graduate School of Medicine, Kyoto, 606-8507, Japan.
The Journal of Biological Chemistry
|March 30, 2001
Summary
Monocyte chemoattractant protein-1 (MCP-1) triggers integrin activation via ERK and chemotaxis via p38-MAPK and Rho GTPases. These distinct pathways are crucial for monocyte transmigration in atherosclerosis.
Area of Science:
- Cellular Biology
- Immunology
- Molecular Biology
Background:
- Monocyte transmigration initiates atherosclerotic plaque formation and inflammation.
- Integrin activation and chemotaxis are key functions in monocyte transmigration.
Purpose of the Study:
- To investigate the roles of MAPK and Rho GTPases in monocyte chemoattractant protein-1 (MCP-1)-induced signaling.
- To delineate the specific pathways regulating integrin activation and chemotaxis.
Main Methods:
- Utilized THP-1 monocytic cells.
- Applied MEK and p38-MAPK inhibitors.
- Used C3 exoenzyme and Rho kinase inhibitors.
- Assessed MCP-1-mediated cell adhesion and chemotaxis.
Main Results:
- MCP-1 stimulated beta1 integrin-dependent adhesion, inhibited by a MEK inhibitor (ERK pathway).
- MCP-1-mediated chemotaxis was inhibited by p38-MAPK and Rho GTPase inhibitors.
- Rho GTPases and Rho kinase were upstream of p38-MAPK activation.
Conclusions:
- ERK signaling mediates MCP-1-induced integrin activation.
- p38-MAPK and Rho GTPases mediate MCP-1-induced chemotaxis.
- Distinct MAPK and Rho signaling cascades are activated by MCP-1, regulating monocyte transmigration.