Electrochemical Detection of Epidermal Growth Factor Receptors on a Single Living Cell Surface by Scanning Electrochemical Microscopy

2009 ◽  
Vol 81 (7) ◽  
pp. 2785-2790 ◽  
Author(s):  
Yasufumi Takahashi ◽  
Takeshi Miyamoto ◽  
Hitoshi Shiku ◽  
Ryutaro Asano ◽  
Tomoyuki Yasukawa ◽  
...  
Keyword(s):  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Cell Surface ◽  
Electrochemical Detection ◽  
Living Cell ◽  
Scanning Electrochemical Microscopy ◽  
Epidermal Growth Factor Receptors ◽  
Epidermal Growth ◽  
Single Living ◽  
Electrochemical Microscopy

scholarly journals The Na+/H+ Exchanger Regulatory Factor Stabilizes Epidermal Growth Factor Receptors at the Cell Surface

2004 ◽  
Vol 15 (12) ◽  
pp. 5470-5480 ◽  
Author(s):  
Cheri S. Lazar ◽  
Catherine M. Cresson ◽  
Douglas A. Lauffenburger ◽  
Gordon N. Gill
Keyword(s):  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Cell Surface ◽  
Growth Factor Receptors ◽  
Cell Surface Receptors ◽  
Epidermal Growth Factor Receptors ◽  
Regulatory Factor ◽  
Down Regulation ◽  
Surface Receptors ◽  
Epidermal Growth

Ligand binding to cell surface receptors initiates both signal transduction and endocytosis. Although signaling may continue within the endocytic compartment, down-regulation is the major mechanism that controls the concentration of cell surface receptors, their ability to receive environmental signals, and the ultimate strength of biological signaling. Internalization, recycling, and trafficking of receptor tyrosine kinases (RTKs) within the endosome compartment are each regulated to control the overall process of down-regulation. We have identified the Na+/H+ exchanger regulatory factor (NHERF) as an important molecular component that stabilizes epidermal growth factor receptors (EGFRs) at the cell surface to restrict receptor down-regulation. The NH2-terminal PDZ domain (PDZ 1) of NHERF specifically binds to an internal peptide motif located within the COOH-terminal regulatory domain of EGFR. Expression of NHERF slows the rate of EGF-induced receptor degradation. A point mutation that abolishes the PDZ 1 recognition sequence of EGFR enhances the rate of ligand-induced endocytosis and down-regulation of EGFR. Similarly, expression of a dominant negative mutant of NHERF enhances EGF-induced receptor down-regulation. In contrast to β-adrenergic receptors where NHERF enhances recycling of internalized receptors, NHERF stabilizes EGFR at the cell surface and slows the rate of endocytosis without affecting recycling. Although the mechanisms differ, for both RTKs and G protein-coupled receptors, the overall effect of NHERF is to enhance the fraction of receptors present at the cell surface.

scholarly journals Regulation of EGFR surface levels by COPII-dependent trafficking

2016 ◽  
Vol 215 (4) ◽  
pp. 441-443 ◽  
Author(s):  
Hesso Farhan
Keyword(s):  
Growth Factor ◽  
Epidermal Growth Factor ◽  
Cell Surface ◽  
Growth Factor Receptors ◽  
Endocytic Trafficking ◽  
Epidermal Growth Factor Receptors ◽  
Cell Biol ◽  
Epidermal Growth

Cell surface levels of epidermal growth factor receptors (EGFRs) are thought to be controlled mainly by endocytic trafficking, with biosynthetic EGFR trafficking presumed to be a constitutive and unregulated process. However, Scharaw et al. (2016. J. Cell Biol. http://dx.doi.org/10.1083/jcb.201601090) demonstrate a role for inducible COPII trafficking in controlling EGFR surface levels.

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