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EGF family ligand-dependent phenotypic modulation of smooth muscle cells through EGF receptor
Y Yamanaka1, K Hayashi, T Komurasaki
1Department of Neuroscience (D13), Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Abstract:
The phenotypic modulation of smooth muscle cells (SMCs) is closely associated with the development and progression of various SMC diseases. We investigated the molecular mechanism of phenotypic modulation triggered by EGF family ligands using a primary culture system of differentiated SMCs. Among four EGF-receptor (EGFR) family members, the EGFR was solely activated by EGF, heparin-binding EGF (HB-EGF), transforming growth factor alpha (TGF alpha), epiregulin (ER), and betacellulin (BTC), resulting in induction of phenotypic modulation of SMCs. This effect was mediated through the coordinated activation of the extracellular signal-regulated kinase (ERK) and p38 mitogen-activated protein kinase (p38MAPK) pathways. These results suggest that EGF family ligand- and EGFR-triggered signaling pathways are critically involved in the phenotypic modulation of SMCs.
Insights
Smooth muscle cell (SMC) phenotypic modulation, linked to SMC diseases, is triggered by Epidermal Growth Factor (EGF) family ligands. These ligands activate the EGF receptor (EGFR), initiating signaling pathways crucial for SMC modulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Physiology
Background:
- Smooth muscle cell (SMC) phenotypic modulation is a key factor in the development and progression of various SMC-related diseases.
- Understanding the molecular mechanisms driving SMC phenotypic modulation is crucial for therapeutic development.
Purpose of the Study:
- To investigate the molecular mechanisms by which Epidermal Growth Factor (EGF) family ligands trigger phenotypic modulation in differentiated SMCs.
- To identify the specific receptors and signaling pathways involved in EGF-induced SMC phenotypic modulation.
Main Methods:
- Utilized a primary culture system of differentiated SMCs.
- Investigated the activation of EGF receptor (EGFR) family members by various EGF family ligands.
- Analyzed the activation of downstream signaling pathways, including extracellular signal-regulated kinase (ERK) and p38 mitogen-activated protein kinase (p38MAPK).
Main Results:
- EGFR was solely activated by specific EGF family ligands: EGF, heparin-binding EGF (HB-EGF), transforming growth factor alpha (TGF alpha), epiregulin (ER), and betacellulin (BTC).
- Activation of EGFR by these ligands induced phenotypic modulation in SMCs.
- The observed phenotypic modulation was mediated by the coordinated activation of the ERK and p38MAPK signaling pathways.
Conclusions:
- EGF family ligands and EGFR-mediated signaling pathways play a critical role in the phenotypic modulation of SMCs.
- Targeting the EGF/EGFR signaling axis presents a potential therapeutic strategy for SMC-related diseases.