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ErbB-2 and met reciprocally regulate cellular signaling via plexin-B1
Jakub M Swiercz1, Thomas Worzfeld, Stefan Offermanns
1Institute of Pharmacology, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany.
The Journal of Biological Chemistry
|November 21, 2007
Summary
Semaphorin 4D (Sema4D) triggers varied cellular responses via plexin-B1, modulated by ErbB-2 and Met receptor tyrosine kinases, influencing breast cancer cell migration.
Area of Science:
- Cellular Biology
- Molecular Biology
- Cancer Research
Background:
- Plexin-B1 receptor signaling by Semaphorin 4D (Sema4D) elicits diverse cellular outcomes.
- The precise mechanisms governing plexin-B1's versatile signaling remain incompletely understood.
- Plexin-B1 is known to interact with receptor tyrosine kinases (RTKs) such as ErbB-2 and Met.
Purpose of the Study:
- To elucidate the mechanisms behind the differential cellular responses induced by Sema4D.
- To investigate the role of ErbB-2 and Met in mediating Sema4D/plexin-B1 signaling.
- To understand how RTK association with plexin-B1 influences Sema4D's biological effects, particularly in breast carcinoma.
Main Methods:
- Investigated the requirement of ErbB-2 and Met for Sema4D-induced RhoA activation and inactivation.
- Utilized breast carcinoma cell models to assess Sema4D's migratory effects.
- Manipulated the presence and exchange of ErbB-2 and Met to observe changes in cellular response to Sema4D.
Main Results:
- Sema4D-induced RhoA activation necessitates ErbB-2, while RhoA inactivation requires Met.
- Sema4D exhibits both pro- and anti-migratory effects on breast carcinoma cells, contingent on ErbB-2 and Met presence.
- Exchanging ErbB-2 and Met is sufficient to switch Sema4D's cellular response from pro- to anti-migratory and vice versa.
Conclusions:
- Identified a novel regulatory mechanism for plexin-mediated signaling.
- Demonstrated that differential association of plexin-B1 with ErbB-2 and Met dictates Sema4D's biological activity.
- Explains how Sema4D can promote or inhibit cell migration based on RTK interactions.
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