alexa Epidermal growth factor receptors destined for the nucleus are internalized via a clathrin-dependent pathway.


Journal of Cancer Science & Therapy

Author(s): De Angelis Campos AC, Rodrigues MA, de Andrade C, de Goes AM, Nathanson MH, , De Angelis Campos AC, Rodrigues MA, de Andrade C, de Goes AM, Nathanson MH,

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Abstract The epidermal growth factor (EGF) transduces its actions via the EGF receptor (EGFR), which can traffic from the plasma membrane to either the cytoplasm or the nucleus. However, the mechanism by which EGFR reaches the nucleus is unclear. To investigate these questions, liver cells were analyzed by immunoblot of cell fractions, confocal immunofluorescence and real time confocal imaging. Cell fractionation studies showed that EGFR was detectable in the nucleus after EGF stimulation with a peak in nuclear receptor after 10 min. Movement of EGFR to the nucleus was confirmed by confocal immunofluorescence and labeled EGF moved with the receptor to the nucleus. Small interference RNA (siRNA) was used to knockdown clathrin in order to assess the first endocytic steps of EGFR nuclear translocation in liver cells. A mutant dynamin (dynamin K44A) was also used to determine the pathways for this traffic. Movement of labeled EGF or EGFR to the nucleus depended upon dynamin and clathrin. This identifies the pathway that mediates the first steps for EGFR nuclear translocation in liver cells. Copyright © 2011 Elsevier Inc. All rights reserved.
This article was published in Biochem Biophys Res Commun and referenced in Journal of Cancer Science & Therapy

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