Signaling pathways for monocyte chemoattractant protein 1-mediated extracellular signal-regulated kinase activation - PubMed (original) (raw)
Signaling pathways for monocyte chemoattractant protein 1-mediated extracellular signal-regulated kinase activation
M Carmen Jiménez-Sainz et al. Mol Pharmacol. 2003 Sep.
Abstract
G protein-coupled receptors (GPCRs) initiate diverse down-stream signaling events in response to ligand stimulation, as rapid activation of the extracellular signal-regulated kinase ERK1 and ERK2. The chemokine monocyte chemoattractant protein-1 (MCP-1) is the agonist for several chemokine receptors that belong to the GPCR superfamily, CCR2 being the most important. Stimulation of mitogen-activated protein kinases (MAPKs) by MCP-1 has been implicated in integrin activation and chemotaxis, but the molecular pathways down-stream of the receptors remain unclear. To dissect the cascade of events leading to MAPK activation upon CCR2 receptor stimulation, several specific inhibitors and mutants of signal transduction proteins were used in monocytic cells endogenously expressing CCR2 and/or in human embryonic kidney-293 cells transfected with CCR2B receptors and epitope-tagged ERK1. We show that ERK activation by MCP-1 involves heterotrimeric Gi protein subunits, protein kinase C, phosphoinositide-3-kinase, and Ras. On the other hand, the activity of cytosolic tyrosine kinases, epidermal growth factor receptor transactivation, or variations in intracellular calcium levels are not required for the mitogenic activation elicited by MCP-1. In addition, we find that internalization of CCR2B itself is not necessary for efficient MCP-1-induced activation of ERK, although a dynamin mutant partially inhibits ERK stimulation. These results suggest that different parallel pathways are being activated that lead to the full activation of the mitogen-activated protein kinase cascade and that internalization of other signaling proteins but not of the receptor is required for complete ERK activation.
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