EGF receptor signaling stimulates SRC kinase phosphorylation of clathrin, influencing clathrin redistribution and EGF uptake
Summary
This summary is machine-generated.Epidermal growth factor (EGF) signaling activates SRC kinase, which phosphorylates clathrin, promoting its assembly and receptor-ligand complex endocytosis. SRC kinase is crucial for efficient EGF receptor endocytosis.
Area Of Science
- Cell biology
- Molecular signaling
- Endocytosis
Background
- Epidermal growth factor (EGF) binding to its receptor (EGFR) initiates downstream signaling pathways.
- Clathrin-mediated endocytosis is a primary mechanism for cellular uptake of receptors and their ligands.
- The precise molecular mechanisms linking EGFR signaling to clathrin function in endocytosis require further elucidation.
Purpose Of The Study
- To investigate the role of SRC kinase in EGF-induced clathrin modification and redistribution.
- To determine the impact of SRC kinase activity on the efficiency of EGFR endocytosis.
Main Methods
- Analysis of clathrin heavy chain phosphorylation at tyrosine 1477 upon EGF stimulation.
- Assessment of clathrin redistribution to the cell periphery using microscopy.
- Evaluation of EGF endocytosis rates in the presence and absence of SRC kinase activity or inhibitors.
- Utilizing cells lacking SRC kinase or treated with SRC family kinase inhibitors.
Main Results
- EGF stimulation leads to rapid phosphorylation of clathrin heavy chain at tyrosine 1477.
- This phosphorylation is dependent on the downstream activation of SRC kinase by EGFR signaling.
- Inhibition or absence of SRC kinase prevents EGF-induced clathrin phosphorylation and redistribution.
- SRC kinase deficiency or inhibition delays EGF endocytosis.
Conclusions
- SRC kinase acts as a key mediator between EGFR signaling and clathrin-mediated endocytosis.
- SRC kinase regulates clathrin assembly and recruitment through phosphorylation during ligand-induced EGFR endocytosis.
- This study identifies a novel mechanism by which receptor signaling controls endocytic processes.
View abstract on PubMed