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ERK5 and ERK2 cooperate to regulate NF-kappaB and cell transformation
G Pearson1, J M English, M A White
1Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-9041, USA.
The Journal of Biological Chemistry
|December 19, 2000
Summary
The study reveals that MEK5-ERK5 signaling collaborates with MEK1/2-ERK1/2 to drive cell focus formation. This pathway activates NF-kappaB and p90 ribosomal S6 kinase, suggesting their roles in this process.
Area of Science:
- Cell Biology
- Molecular Biology
- Signal Transduction
Background:
- Previous work indicated MEK5 and ERK5 involvement in RafBXB-stimulated focus formation.
- The intricate signaling networks governing cell transformation require further elucidation.
Purpose of the Study:
- To investigate the cooperative roles of MEK5-ERK5 and MEK1/2-ERK1/2 pathways in focus formation.
- To identify downstream effectors of MEK5-ERK5 signaling relevant to focus-forming activity.
Main Methods:
- Focus formation assays in NIH3T3 cells.
- Analysis of signaling pathway activation, including NF-kappaB and p90 ribosomal S6 kinase.
- Utilizing constitutively active MEK variants and assessing pathway requirements.
Main Results:
- MEK5 and ERK5 were found to cooperate with MEK1/2 and ERK1/2 to induce foci.
- Constitutively active MEK5 and MEK1 synergistically activated NF-kappaB.
- MEK5 and ERK5 were essential for RafBXB-mediated NF-kappaB activation.
- The MEK5-ERK5 pathway independently activated both NF-kappaB and p90 ribosomal S6 kinase.
Conclusions:
- NF-kappaB and p90 ribosomal S6 kinase are implicated in MEK5-ERK5-dependent focus formation.
- These kinases may act as integration points for both ERK5 and ERK1/2 signaling pathways.
- Findings provide insight into the molecular mechanisms of cell transformation driven by specific signaling pathways.