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Published on: April 3, 2021
Delineating v-Src downstream effector pathways in transformed myoblasts
L Ciuffini1, L Castellani, E Salvati
1Istituto di Biologia Cellulare, Consiglio Nazionale delle Ricerche, Monterotondo Scalo (RM), Italy.
Oncogene
|July 20, 2007
Summary
v-Src tyrosine kinase drives avian myoblast proliferation by inhibiting p38 MAPK. Restoring p38 MAPK activity and inhibiting MAPK kinase can reverse these effects, enabling muscle differentiation.
Area of Science:
- Cell Biology
- Molecular Biology
- Cancer Research
Background:
- v-Src tyrosine kinase is implicated in cellular transformation.
- Understanding signaling pathways is crucial for targeting cancer growth and differentiation.
Purpose of the Study:
- To investigate intracellular signaling pathways affected by v-Src in avian myoblasts.
- To identify key targets for reversing v-Src-induced proliferation and blocked differentiation.
Main Methods:
- Inhibition of Ras-MAPK kinase and phosphatidylinositol 3-kinase.
- Forced activation of p38 MAPK.
- Analysis of muscle-specific gene expression and cell fusion.
Main Results:
- Both Ras-MAPK kinase and PI3K pathways are essential for v-Src-mediated proliferation.
- Ras-MAPK kinase pathway blocks differentiation independently of proliferation.
- v-Src inhibits p38 MAPK; its activation inhibits growth and promotes differentiation.
- Cross-regulation between Ras-MAPK kinase and p38 MAPK pathways observed.
Conclusions:
- p38 MAPK is a critical target for v-Src-induced growth transformation and blocked myogenic differentiation.
- Targeting MAPK kinase and calpain, alongside p38 MAPK activation, can restore differentiation potential in v-Src-transformed myoblasts.
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