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Epidermal Growth Factor and Membrane Trafficking

Barbieri, M. Alejandro, Roberts, Richard L., Gumusboga, Aysel, Highfield, Hilary, Alvarez-Dominguez, Carmen, Wells, Alan, Stahl, Philip D.·2000·The Journal of Cell Biology
DOI 10.1083/jcb.151.3.539PMC PMC2185585
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Abstract

Activated epidermal growth factor receptors recruit various intracellular proteins leading to signal generation and endocytic trafficking. Although activated receptors are rapidly internalized into the endocytic compartment and subsequently degraded in lysosomes, the linkage between signaling and endocytosis is not well understood. Here we show that EGF stimulation of NR6 cells induces a specific, rapid and transient activation of Rab5a. EGF also enhanced translocation of the Rab5 effector, early endosomal autoantigen 1 (EEA1), from cytosol to membrane. The activation of endocytosis, fluid phase and receptor mediated, by EGF was enhanced by Rab5a expression, but not by Rab5b, Rab5c, or Rab5a truncated at the NH2 and/or COOH terminus. Dominant negative Rab5a (Rab5:N34) blocked EGF-stimulated receptor-mediated and fluid-phase endocytosis. EGF activation of Rab5a function was dependent on tyrosine residues in the COOH-terminal domain of the EGF receptor (EGFR). Removal of the entire COOH terminus by truncation (c'973 and c'991) abrogated ligand-induced Rab5a activation of endocytosis. A “kinase-dead” EGFR failed to stimulate Rab5a function. However, another EGF receptor mutant (c'1000), with the kinase domain intact and a single autophosphorylation site effectively signaled Rab5 activation. These results indicate that EGFR and Rab5a are linked via a cascade that results in the activation of Rab5a and that appears essential for internalization. The results point to an interdependent relationship between receptor activation, signal generation and endocytosis.

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Figure 1 EGF induces the formation of enlarged Rab5-positive endosomes. Cells expressing GFP-Rab5a (A and D), GFP-Rab5a:L79 (B and E), and GFP-Rab5a:N34 (C and F) were grown on coverslips and then were incubated in the presence or absence of 100 nM EGF for 15 min at 37°C. After stimulation, the cells were fixed with 2% paraformaldehyde, and then visualized by confocal microscopy. Cells expressing GFP-Rab5a (G–I) were incubated in the presence of 200 nM Texas red–EGF for 10 min at 37°C, fixed, and then visualized by confocal microscopy. Internalized Texas red–EGF (I) accumulated in the enlarged endosomes in cells expressing Rab5a (G). The yellow color indicates areas of colocalization of internalized Texas red–EGF and GFP-Rab5a (I). Optical sections viewed are 0.4 μM. Bars, 1 μM.
Figure 1 EGF induces the formation of enlarged Rab5-positive endosomes. Cells expressing GFP-Rab5a (A and D), GFP-Rab5a:L79 (B and E), and GFP-Rab5a:N34 (C and F) were grown on coverslips and then were incubated in the presence or absence of 100 nM EGF for 15 min at 37°C. After stimulation, the cells were fixed with 2% paraformaldehyde, and then visualized by confocal microscopy. Cells expressing GFP-Rab5a (G–I) were incubated in the presence of 200 nM Texas red–EGF for 10 min at 37°C, fixed, and then visualized by confocal microscopy. Internalized Texas red–EGF (I) accumulated in the enlarged endosomes in cells expressing Rab5a (G). The yellow color indicates areas of colocalization of internalized Texas red–EGF and GFP-Rab5a (I). Optical sections viewed are 0.4 μM. Bars, 1 μM.CC BY-NC-SA · PubMed Central
Figure 2 Membrane-cytosol redistribution of Rab proteins in the presence of EGF. (A) Cells expressing EGFR:WT (wild type) and mutants labeled with 32Pi, were transfected with GFP-Rab5a. Cells were incubated with 100 nM EGF for 15 min and the nucleotide status of Rab5 was analyzed as indicated in Materials and Methods (mean ± SD, n = 3.) (Bottom) The results from a typical experiment. (B) Cells expressing EGFR:WT were transfected with GFP-Rab5a. After transfection, the cells were incubated in the presence 100 nM EGF for 15 min and the membrane-cytosol distribution of EEA1 proteins was analyzed by Western blot. The experiment was repeated three times with similar results.
Figure 2 Membrane-cytosol redistribution of Rab proteins in the presence of EGF. (A) Cells expressing EGFR:WT (wild type) and mutants labeled with 32Pi, were transfected with GFP-Rab5a. Cells were incubated with 100 nM EGF for 15 min and the nucleotide status of Rab5 was analyzed as indicated in Materials and Methods (mean ± SD, n = 3.) (Bottom) The results from a typical experiment. (B) Cells expressing EGFR:WT were transfected with GFP-Rab5a. After transfection, the cells were incubated in the presence 100 nM EGF for 15 min and the membrane-cytosol distribution of EEA1 proteins was analyzed by Western blot. The experiment was repeated three times with similar results.CC BY-NC-SA · PubMed Central
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Figure 4 Endocytosis of EGF requires the small GTPase Rab5. (A) Cells expressing EGFR:WT were either transfected with virus alone (○), virus encoding Rab5a (•), virus encoding Rab7 (▴), or virus encoding Rab11 (▪). After transient transfection, the amount of 125I-EGF internalized at 37°C for the indicated times was quantified. This experiment was repeated at least four times, and the results were highly reproducible. (B) Cells expressing EGFR were transiently transfected with either virus alone, virus encoding Rab5, Rab5:N34, Rab5:N34/ΔN19, Rab5:ΔN19, Rab5:ΔC4, or Rab5:ΔC4N34. After transfection, uptake of 125I-EGF was carried out at 37°C for 10 min (mean ± SD, n = 3). (C) Cells transfected with virus alone or virus encoding Rab5:WT or Rab5:N34 were treated with EGF for different times. Surface EGFR was analyzed by 125I -EGF binding as described in Materials and Methods. This experiment was repeated at least three times, and the results were reproducible. (D) 35S-methionine–labeled NR6 cells transfected with virus alone, or virus encoding Rab5:WT or Rab5:N34, were treated with EGF. At the indicated times, aliquots were removed and EGFR was immunoprecipitated from cell lysates with anti–human EGFR antibody as described in Materials and Methods.
Figure 4 Endocytosis of EGF requires the small GTPase Rab5. (A) Cells expressing EGFR:WT were either transfected with virus alone (○), virus encoding Rab5a (•), virus encoding Rab7 (▴), or virus encoding Rab11 (▪). After transient transfection, the amount of 125I-EGF internalized at 37°C for the indicated times was quantified. This experiment was repeated at least four times, and the results were highly reproducible. (B) Cells expressing EGFR were transiently transfected with either virus alone, virus encoding Rab5, Rab5:N34, Rab5:N34/ΔN19, Rab5:ΔN19, Rab5:ΔC4, or Rab5:ΔC4N34. After transfection, uptake of 125I-EGF was carried out at 37°C for 10 min (mean ± SD, n = 3). (C) Cells transfected with virus alone or virus encoding Rab5:WT or Rab5:N34 were treated with EGF for different times. Surface EGFR was analyzed by 125I -EGF binding as described in Materials and Methods. This experiment was repeated at least three times, and the results were reproducible. (D) 35S-methionine–labeled NR6 cells transfected with virus alone, or virus encoding Rab5:WT or Rab5:N34, were treated with EGF. At the indicated times, aliquots were removed and EGFR was immunoprecipitated from cell lysates with anti–human EGFR antibody as described in Materials and Methods.CC BY-NC-SA · PubMed Central
Figure 5 Endocytosis of HRP and EGF require an intact cytoplasmic domain of the EGFR. Cells expressing either EGFR:WT, EGFR:c'973, EGFR:c'991, or EGFR:c'1000 were transfected with virus alone or virus encoding Rab5. After transient transfection, the amount of HRP (A) or 125I-EGF (B) internalized at 37°C was quantified as described in Materials and Methods (mean ± SD, n = 4). (C and D) Cells were transfected with virus alone, or virus encoding Rab5, or Rab5:N34 and the internalization of either HRP (C) or 125I-Tf (D) was carried out for 10 min at 37°C in the presence or absence of 6 μg/ml transferrin. Mean ± SD, n = 3.
Figure 5 Endocytosis of HRP and EGF require an intact cytoplasmic domain of the EGFR. Cells expressing either EGFR:WT, EGFR:c'973, EGFR:c'991, or EGFR:c'1000 were transfected with virus alone or virus encoding Rab5. After transient transfection, the amount of HRP (A) or 125I-EGF (B) internalized at 37°C was quantified as described in Materials and Methods (mean ± SD, n = 4). (C and D) Cells were transfected with virus alone, or virus encoding Rab5, or Rab5:N34 and the internalization of either HRP (C) or 125I-Tf (D) was carried out for 10 min at 37°C in the presence or absence of 6 μg/ml transferrin. Mean ± SD, n = 3.CC BY-NC-SA · PubMed Central
Figure 6 Formation of enlarged Rab5-positive endosomes requires an intact cytoplasmic domain of the EGFR. Cells expressing either EGFR:WT, EGFR:c'973, EGFR:c'991, or EGFR:c'1000 were transfected with virus encoding GFP-Rab5a. After transient transfection, the cells were incubated with EGF and the formation of enlarged endosomes were visualized by confocal microscopy as described in Materials and Methods. This experiment was repeated three times and the results were highly reproducible.
Figure 6 Formation of enlarged Rab5-positive endosomes requires an intact cytoplasmic domain of the EGFR. Cells expressing either EGFR:WT, EGFR:c'973, EGFR:c'991, or EGFR:c'1000 were transfected with virus encoding GFP-Rab5a. After transient transfection, the cells were incubated with EGF and the formation of enlarged endosomes were visualized by confocal microscopy as described in Materials and Methods. This experiment was repeated three times and the results were highly reproducible.CC BY-NC-SA · PubMed Central
Figure 7 EGFR specifically regulates Rab5a function. (A) Cells expressing EGFR:WT were transfected with virus alone or virus encoding Rab5a, Rab5b, or Rab5c, and the internalization of HRP in the presence or absence of 100 nM EGF was carried out for 10 min at 37°C (mean ± SD, n = 3). (B) Cells expressing EGFR:WT were transfected as in A. After transfection, the uptake of 125I-EGF was carried out at 37°C for 10 min as described in Materials and Methods. Mean ± SD, n = 3.
Figure 7 EGFR specifically regulates Rab5a function. (A) Cells expressing EGFR:WT were transfected with virus alone or virus encoding Rab5a, Rab5b, or Rab5c, and the internalization of HRP in the presence or absence of 100 nM EGF was carried out for 10 min at 37°C (mean ± SD, n = 3). (B) Cells expressing EGFR:WT were transfected as in A. After transfection, the uptake of 125I-EGF was carried out at 37°C for 10 min as described in Materials and Methods. Mean ± SD, n = 3.CC BY-NC-SA · PubMed Central
Figure 8 The formation of enlarged endosomes by EGF is specific for the Rab5a isoform. Cells expressing EGFR:WT were transfected with virus encoding GFP-Rab5a (A and D), GFP-Rab5b (B and E), or GFP-Rab5c (C and F), and the visualization of the formation of enlarged endosomes were analyzed as described in Materials and Methods. This experiment was repeated three times and the results were highly reproducible.
Figure 8 The formation of enlarged endosomes by EGF is specific for the Rab5a isoform. Cells expressing EGFR:WT were transfected with virus encoding GFP-Rab5a (A and D), GFP-Rab5b (B and E), or GFP-Rab5c (C and F), and the visualization of the formation of enlarged endosomes were analyzed as described in Materials and Methods. This experiment was repeated three times and the results were highly reproducible.CC BY-NC-SA · PubMed Central

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Authors
Barbieri, M. A., Roberts, R. L., Gumusboga, A., Highfield, H., Alvarez-Dominguez, C., Wells, A., & Stahl, P. D.
Affiliations
  • aDepartment of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110
  • bCentro de Biologia Molecular SEVERO OCHOA, 28033 Madrid, Spain
  • cDepartment of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Venue
The Journal of Cell Biology
Publisher
Rockefeller University Press
Published
2000-10-30
Volume
151
Issue
3
Pages
539-550
ISSN
  • 0021-9525
  • 1540-8140
DOI
10.1083/jcb.151.3.539
PMC
PMC2185585
Cited by
204
References
1
Language
en

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