1. Volume 40, Issue 3, Pages 278-288.e5 (February 2017)
Crosstalk between CLCb/Dyn1-Mediated Adaptive Clathrin-Mediated Endocytosis and Epidermal Growth Factor Receptor Signaling Increases Metastasis 
Ping-Hung Chen, Nawal Bendris, Yi-Jing Hsiao, Carlos R. Reis, Marcel Mettlen, Hsuan-Yu Chen, Sung-Liang Yu, Sandra L. Schmid 
Developmental Cell 
Volume 40, Issue 3, Pages e5 (February 2017)
DOI: /j.devcel
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2. Developmental Cell 2017 40, 278-288. e5DOI: (10. 1016/j. devcel. 2017
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3. Figure 1 CLCb Is Upregulated in NSCLC
(A) Protein levels of CLCb in NCI 60 cell lines (
(B) Images of low and high immunohistochemistry (IHC) of CLCb levels in representative tumor tissues. Scale bar, 50 μm. Quantification of CLCb expression according to low and high IHC levels in normal (n = 15), stage I tumor (I, n = 23), stage II tumor (II, n = 14), stage III tumor (III, n = 13) and metastatic tumor tissues (n = 10).
(C) Representative western blot of CLCs in H1299, A549, H522, H226, and EKVX cells.
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4. Figure 2
Differential Rates of CME, CCP Initiation, and Maturation in Single CLCa- versus CLCb-Expressing Cells
(A) Representative western blot of CLCs and CHC in parental H1299 cells and single CLC H1299 cells engineered to express saturating levels of either CLCa (sCLCa) or CLCb (sCLCb).
(B) The CLC binding to CHC was examined by immunoprecipitation of CHC followed by western blotting using CHC or CLC antibodies. One hundred percent of input and immunoprecipitated pellets were loaded.
(C) Endocytosis and recycling of TfnR were measured in parental, sCLCa, and sCLCb H1299 cells. Percentage of internalized TfnR was calculated relative to the initial surface TfnR. Percentage of recycled biotinylated-Tfn was calculated relative to the initial loading (10 min).
(D) Endocytosis and recycling of biotinylated EGF (20 ng/mL) were measured in parental, sCLCa, and sCLCb H1299 cells. Percentage of internalized biotinylated EGF was calculated relative to the initial surface bound. Percentage of recycled biotinylated EGF was calculated relative to the initial loading (10 min).
(E) Average CCP lifetime distribution in sCLCa and sCLCb H1299 cells.
(F) Rate of initiation (# CCP/μm2/min) of bona fide CCPs in sCLCa (0.088 ± CCP/μm2/min) and sCLCb (0.151 ± CCP/μm2/min) H1299 cells.
Data in (C) and (D) are presented as mean ± SEM, n = 3. Data in (E) and (F) are from n = 3 independent experiments, 20 cells in total. Statistical significance was analyzed by Student's t test (∗∗p < 0.05, ∗∗∗p < 0.01).
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5. Figure 3
CLCb Upregulation Alters EGFR Trafficking in a Dynamin-1-Dependent Manner
(A) Representative western blot of CLCs and CHC in parental and H1299 cells overexpressing CLCb to switch CLC isoform distribution (swCLCb).
(B) CLC binding to CHC was examined by immunoprecipitation of CHC followed by western blotting using CHC or CLC antibodies. One hundred percent of input and immunoprecipitated pellets were loaded.
(C) Endocytosis and recycling (10-min pulse) of biotinylated EGF measured in parental, swCLCb, D1KO, and D1KO/swCLCb H1299 cells. Percentage of internalized biotinylated EGF relative to the initial surface binding is shown. Percentage of recycled biotinylated EGF was calculated relative to the initial loading (10 min).
(D and E) Endocytosis (D) and recycling (E) of biotinylated EGF (20 ng/mL) were measured in control and CLCb siRNA-treated H226 and EKVX cells, as described in (C).
(F) Surface levels of EGFR in control and CLCb siRNA-treated H226 and EKVX cells.
(G) Representative western blots of CLCb knockdown efficiency in control and CLCb siRNA-treated H226 and EKVX cells.
(H) Representative western blot of Dyn1 and Dyn2 expression in parental and swCLCb H1299 cells.
Data in (C)–(F) are presented as mean ± SEM, n = 3. Statistical significance was analyzed by Student's t test (∗p < 0.1, ∗∗p < 0.05, ∗∗∗p < 0.01; n.s., not significant).
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6. Figure 4
CLCb Upregulation Increased Akt/GSK3β Phosphorylation, Leading to Altered EGFR Trafficking
(A) Quantification of the extent of Akt (Ser473) and GSK3β (Ser9) phosphorylation at the indicated times after treatment of parental or swCLCb H1299 cells with EGF (20 ng/mL).
(B) Endocytosis and recycling of biotinylated EGF in parental and swCLCb H1299 cells with or without treatment with the specific Akt inhibitor, X (10 μM).
(C) Quantification of Akt (Ser473) and GSK3β (Ser9) phosphorylation in parental, swCLCb, Dyn1KO, and Dyn1KO/swCLCb H1299 cells 10 min after addition of EGF (20 ng/mL).
Values are presented as mean ± SEM, n = 3. Statistical significance was analyzed by Student's t test (∗p < 0.1, ∗∗p < 0.05, ∗∗∗p < 0.01; n.s., not significant).
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7. Figure 5
An Increase in APPL1-Positive Endosomes in swCLCb Cells Leads to Increased Akt/GSK3β Phosphorylation
(A) Representative IF staining image and quantification of APPL1-positive endosomes in parental and swCLCb H1299 cells. Scale bar, 10 μm.
(B) Quantification of effect of siRNA-mediated knockdown of APPL1 on phosphorylation of Akt (Ser473) and GSK3β (Ser9) in response to treatment with EGF (20 ng/mL) in parental and swCLCb H1299 cells. Controls were transfected with a non-specific siRNA. Values are presented as mean ± SEM, n = 3.
(C) Representative IF staining image and quantification of APPL1-positive endosomes in Dyn1 KO and Dyn1 KO/swCLCb H1299 cells. Scale bar, 10 μm.
Values are presented as mean ± SEM, n = 20 cells. Statistical significance was analyzed by Student's t test (∗∗∗p < 0.01; n.s., not significant).
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8. Figure 6
Upregulation of CLCb Enhances Cancer Cell Migration and Metastasis
(A) Average migration speed and directionality of EGF-treated (20 ng/mL) parental, swCLCb, D1KO, and D1KO/swCLCb H1299 cells.
(B) Representative gross view of lungs from mice euthanized 8 weeks after injection of parental and swCLCb H1299 cells into the left lung. Yellow arrows indicate tumor nodules on orthogonal, right lung. Scale bar, 1 cm.
(C) Average number of metastatic tumor nodules developed in right lung lobes from mice euthanized 8 weeks after orthogonal lung injection.
(D) Representative H&E-stained histological image of metastatic nodules on right lungs from mice receiving swCLCb H1299 cells. Yellow arrow indicates tumor site. Scale bar, 100 μm.
Values in (A) and (C) are mean ± SEM, n = 6 mice. Statistical significance was analyzed by Student's t test (∗p < 0.1, ∗∗p < 0.05).
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9. Figure 7 CLCb and Dyn1 are Predicted as High-Risk Factors in NSCLC
(A and B) Kaplan-Meier survival analysis of NSCLC patients was performed in CLCb (A) and Dyn1 (B) high- and low-expression cohorts.
(C) Model of CLCb/Dyn1-dependent adaptive CME. Upregulation of CLCb leads to increased activation of Dyn1 through a positive feedback loop involving APPL1-positive endosomes and increased Akt/GSK3β phosphorylation. Prolonged Akt signaling from APPL1-positive endosomes activates Dyn1 that contributes to abnormal EGFR trafficking and signaling, leading to increased migration and metastasis.
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