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Exp Cell Res ; 380(1): 69-79, 2019 07 01.
Article in English | MEDLINE | ID: mdl-30970237

ABSTRACT

The role of plasma membrane composition and dynamics in the activation process of receptor tyrosine kinases (RTKs) is still poorly understood. In this study we have investigated how signaling via the RTK, platelet-derived growth factor ß-receptor (PDGFR-ß) is affected by Dynasore or Dyngo-4a, which are commonly used dynamin inhibitors. PDGFR-ß preferentially internalizes via clathrin-coated pits and in this pathway, Dynamin II has a major role in the formation and release of vesicles from the plasma membrane by performing the membrane scission. We have found that dynamin inhibitors impedes the activation of PDGFR-ß by impairing ligand-induced dimerization of the receptor monomers, which leads to a subsequent lack of phosphorylation and activation both of receptors and downstream effectors, such as ERK1/2 and AKT. In contrast, dynamin inhibitors did not affect epidermal growth factor receptor (EGFR) dimerization and phosphorylation. Our findings suggest that there is a link between plasma membrane dynamics and PDGFR-ß activation, and that this link is not shared with the epidermal growth factor receptor.


Subject(s)
Dynamins/genetics , Protein Multimerization/drug effects , Receptor, Platelet-Derived Growth Factor beta/genetics , Signal Transduction/drug effects , Cell Membrane/drug effects , Dynamins/antagonists & inhibitors , ErbB Receptors/antagonists & inhibitors , ErbB Receptors/genetics , Fibroblasts/drug effects , Gene Expression/drug effects , Humans , Hydrazones/pharmacology , Ligands , MAP Kinase Signaling System/drug effects , Naphthols/pharmacology , Phosphorylation/drug effects , Protein Multimerization/genetics , Proto-Oncogene Proteins c-akt/genetics , Receptor, Platelet-Derived Growth Factor beta/chemistry , Signal Transduction/genetics
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