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37 protocols using anti eea1

1

Transferrin Trafficking Dynamics in RPE Cells

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RPE cells were incubated with 20 μg/ml of A647-Tfn for indicated times at 37°C and then immediately placed on ice and washed three times in ice-cold PBS2+ to remove unbound ligand, fixed in 4% paraformaldehyde, permeabilized in 0.1% Triton X-100, stained with either anti-EEA1 (Cell Signaling Technology) or anti-TfR (Santa Cruz Biotechnology) and appropriate secondary antibodies, and then mounted in fluorescence mounting me­dium (Dako). Colocalization of A647-Tfn with either EEA1 or TfR was performed in ImageJ using Pearson’s r. The results were subjected to two-way analysis of variance (ANOVA) followed by Bonferonni’s multiple comparison posttest.
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2

Antibody Reagents for Cell Signaling

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Anti-LC3B, anti-Bcl-xL, anti-Atg16L1, anti-Rac1, anti-Rho1, anti-Cdc42, anti-phospho-ERK, anti-EEA1 and anti-LAMP1 antibodies were purchased from Cell Signaling Technology (Danvers, MA, USA). Mouse monoclonal antibodies reactive with LRP1 (11H4) were a kind gift from Dr. Strickland, University of Maryland School of Medicine, Baltimore. Fibronectin (EP5) and ubiquitin (P4D1) were from Santa Cruz Biotechnologies (Santa Cruz, CA, USA); anti-Cx43, anti-ERK, anti-Bcl-2 and anti-RPTPβ antibodies were from BD Biosciences (Tokyo, Japan); anti-multi ubiquitin monoclonal antibody (FK1) was from MBL (Nagoya, Japan); anti-GAPDH antibody was from GeneTex (Irvine, CA, USA) and anti-LC3 (clone 1703) antibody was from Cosmo Bio (Tokyo, Japan). Anti-RPTPα rabbit polyclonal antibodies for immunoblotting were provided by Dr. Jan Sap; anti-α-tubulin and anti-FLAG M2 antibodies, N-acetyl-l-cysteine (NAC) and ammonium chloride were from Sigma Aldrich (St. Louis, MO, USA); ProLong Gold Antifade Reagent with DAPI and DIDS were from Invitrogen (Eugene, OR, USA); an ERK inhibitor, U0126, was from Cayman Chemical (Ann Arbor, MI, USA); Rac1 inhibitor, NSC23766 was from Wako Pure Chemical Industries (Osaka, Japan); and GSH was from Merck (Darmstadt, Germany).
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3

Immunofluorescence Staining of STING and Related Proteins

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Transfection and immune staining were performed in Millicell EZ chamber slides (Millipore Sigma, Temecula, CA, USA). Cells were fixed by 4% formaldehyde in PBS for 15 min, permeabilized by 0.4% Triton X-100 on ice for 10 min, and stained with rabbit anti-STING antibody (1:400; Novus bio, NBP2-24683) overnight at 4°C, or in the case of cells transfected with FLAG-STINGΔTM, stained with Cy3-conjugated anti-FLAG antibody (Sigma, A9594). For recombinant STING, proteins were conjugated with NHS–Alexa Fluor 488 (Thermo Fisher Scientific). Other primary antibodies used are anti-TBK1 (Abcam, ab235253), anti-LAMP1 (Cell Signaling, 9091S), and anti-EEA1 (Cell Signaling, 3288S). After washing with PBS containing 0.05% Tween 20, cells were stained with secondary antibodies including Alexa Fluor 568–conjugated goat anti-rabbit IgG antibody (Thermo Fisher Scientific, no. A-11011) and Alexa Fluor 488–conjugated donkey anti-rabbit IgG antibody (Thermo Fisher Scientific, no. A-32790). Nuclei were counterstained with 4′,6-diamidino-2-phenylindole (DAPI) and Golgi apparatus was stained with Golgi-ID green detection kit (Enzo Life Sciences, 51028-GG). Cells were imaged with an inverted Olympus IX83 microscope equipped with a Hamamatsu ImagEM high-sensitivity camera at the Swanson Biotechnology Center (MIT).
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4

Antibody Characterization for Cell Biology

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The following antibodies were used: anti-EHD1 (109311, Abcam), affinity-purified rabbit polyclonal peptide antibody directed against the C-terminus of CORO2A (RELLTQREVQAKQLELEIKN; LifeTein for IP and immunoblotting), anti-TOM20 (sc-11415, Santa Cruz Biotechnology), anti-HA (T501, SAB), anti-FLAG (F1804, Sigma for immunofluorescence; ab205606, Abcam for immunoblotting), anti-GST-HRP (A01380, GenScript), anti-GAPDH-HRP (HRP-60004, Proteintech), anti-MHC-1 (purified W6/32, Leinco Technologies), anti-CD98 (315602, BioLegend), anti-CD59 (A4-233-C100, Exbio), anti-EEA1 (3288, Cell Signaling), anti-MICAL-L1 (H00085377-B01P, Novus), donkey anti-mouse-HRP (715-035-151, Jackson), mouse anti-rabbit IgG light chain-HRP (211-032-171, Jackson), Alexa Fluor 568–conjugated goat anti-rabbit (A11036, Molecular Probes), Alexa Fluor 568–conjugated donkey anti-mouse (21043, Molecular Probes), Alexa Fluor 488–conjugated goat anti-rabbit (A11034, Molecular Probes), and Alexa Fluor 488–conjugated donkey anti-mouse (A21202, Molecular Probes). The following reagents were used: CF-568–conjugated Phalloidin (44-T VWR, Biotium), cytochalasin D (Calbiochem), Alexa fluor 568–conjugated transferrin (Molecular Probes), Rhodamine-tagged EGF(Invitrogen), and Blasticidin S HCl (ThermoFisher Scientific).
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5

Endothelial Cell Signaling Pathway Regulation

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Recombinant human TNF-α was purchased from R&D Systems (Wiesbaden-Norderstedt, Germany). Anti-PAR-1 (ATAP2), anti-NQO1, anti-eNOS, and anti-VCAM-1 were from Santa Cruz Biotechnology (Santa Cruz, CA, USA), and anti-phospho-HDAC5, anti-HDAC5, anti-phospho-ERK5, anti-ERK5, anti-phospho-AKT, anti-AKT, anti-phospho-AMPK, anti-AMPK, anti-phospho-eNOS, anti-EEA1, anti-phospho-Src, anti-phospho-FAK, anti-phospho-Erk1/2, anti-Erk1/2 and anti-VE-cadherin were from Cell Signaling Technology (Danvers, MA, USA). Anti-COX-2 was from Cayman Chemical Company (Ann Arvor, MI, USA). Anti-tubulin was from Sigma–Aldrich (St. Louis, MO, USA). Phenylephrine, Acetylcholine and U46619 were purchased from Sigma–Aldrich (St. Louis, MO, USA). Pertussis toxin (PTX) was purchased from Gibco. Small interfering RNA against human PAR-1 was purchased from Santa Cruz Biotechnology (sc-36663, Santa Cruz, CA, USA). For PAR-1 silencing, HUVECs were transiently transfected with 100 pmol/L of control RNA or siRNA targeting human PAR-1 using Lipofectamine 2000 reagent (#11668-019, Invitrogen, Carlsbad, CA, USA) according to the manufacturer’s instructions. A non-specific control siRNA from Bioneer was used as a negative control. HUVECs were harvested 48–72 hours after siRNA transfection, protein expressions were assessed by immunoblotting with antibodies and mRNA levels by quantitative real time RT-PCR (RT-qPCR).
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6

Quantifying E-cadherin and EGFR Trafficking

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Cells were plated on coverslips and were transfected with shRNA for 48 h. Cells were then fixed for 15 min in 10% formalin and permeabilized for 5 min with 0.3% Triton X-100. After blocking in 10% normal goat serum, cells were stained using an anti-E-cadherin antibody (R&D Systems; 1:50) followed by an Alexa546-conjugated secondary antibody. EGF-treated transfected cells were fixed/permeabilized for 10 min in methanol. After blocking in 1% BSA, the cells were incubated with an anti-EEA1 (Cell Signaling; 1:100) or anti-LAMP2 antibody (Abcam, Cambridge, UK; 1:100) followed by a FITC-conjugated secondary antibody and then with an Alexa555-conjugated anti-EGFR antibody (Cell Signaling; 1:100) Cells were counterstained with 4,6-diamidino-2-phenylindole (DAPI; Sigma) to visualize nuclei. Mounted samples were visualized with a confocal microscope (LSM 510 META; Carl Zeiss, Jena, Germany). Intensity of E-cadherin staining was quantitated by ImageJ software. Quantitative co-localization analysis of EGFR and EEA1 or LAMP2 was performed by calculating Pearson’s correlation coefficient (r) using ImageJ software.
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7

Immunofluorescence Staining of Cell Organelles

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Cells were grown on cover glasses for 1 day, rinsed with TBS at room temperature and fixed for 10 min with 4% paraformaldehyde. After rinsing with TBS, in the case of permeabilized conditions, cells were incubated with 0.1% Triton X-100 in TBS for 30 min followed by 30 min in blocking buffer (BSA 2% in TBS-T 0.1% Triton X-100) at room temperature. For non-permeabilized conditions, cells were directly incubated in blocking buffer (BSA 2% in TBS) for 1 h at room temperature. Next, cells were incubated in the suitable primary antibodies for 1 h at room temperature and rinsed repeatedly with TBS before incubating in the appropriate fluorescein-labelled secondary antibody for 1 h at room temperature. Cells were then washed extensively with TBS and mounted on a glass slide in Prolong Diamond Antifade mountant with DAPI (Pierce, Thermo Fisher Scientific). The following primary antibodies were used: anti-EEA1 (1:1000) (Cell Signalling), anti-LAMP-1 (1:1000) (Santa Cruz), anti-avb3 (1:50) clone LM609 (Merck), and anti-tubulin (1:1000) (DM1a-FTIC, Sigma). The following secondary antibodies were used: goat anti-mouse IgG (H + L) Alexa Fluor Plus 488 and goat anti-rabbit IgG (H + L) Alexa Fluor 633 (Thermo Fisher Scientific) (1:1000).
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8

Visualizing Autophagy and Lysosomal Dynamics

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The plasmids GFP-LC3, CFP-LC3 and YFP-LAMP1 were gifts from Dr Wei Liu (Department of Biochemistry and Molecular Biology; Zhejiang University School of medicine). The ORMOSIL nanoparticles were a gift from Dr Jun Qian (State Key Laboratory of Modern Optical Instrumentation; Zhejiang University) and suspended in Phosphate Buffered Saline (PBS). The blocking serum and Alexa Fluor 488-conjugated goat anti-rabbit second antibody were from Zhongshan Golden Bridge Biotechnology.
The following primary antibodies were used: anti-EEA1 (Cell signaling, 3288), anti-LAMP1 (Cell signaling, 9091), anti-LC3 (Sigma, L7543).
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9

Chromatin Immunoprecipitation Antibody Panel

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anti-H3K27ac (Cat# 8173), anti-Batf (Cat# 8638), anti-H3K27me3 (Cat# 9733), anti-Mbd3 (Cat# 99169), anti-Chd3 (Cat# 4241), anti-Rbap46 (Cat# 6882), anti-Hdac1 (Cat# 34589), anti-Hdac2 (Cat# 57156), anti-EEA1 (Cat# 3288), anti-H3 (Cat# 4499), and anti-β-actin (Cat# 3700) were from Cell Signaling Technology (Danvers, USA). Anti-Kcnt2 (Cat# bs-12177R) was from Bioss Antibodies (Beijing, China). Anti-CD127 (A7R34), anti-c-Kit (2B8), anti-CD3 (17A2), anti-CD4 (GK1.5), anti-CD19 (1D3), anti-NK1.1 (PK136), anti-CD150 (mShad150), anti-CD34 (RAM34), anti-CD45 (30-F11), anti-CD90 (HIS51), anti-Sca-1 (D7), anti-CD25 (PC61.5), anti-Flt3 (A2F10), anti-α4β7 (DATK32), anti-RORγt (AFKJS-9), anti-NKp46 (29A1.4), anti-Gata3 (TWAJ), anti-KLRG1 (2F1), anti-PLZF (Mags.21F7), Lineage cocktail (88-7772-72), anti-CD48 (HM48-1), Anti-IL-17 (eBio17B7), and anti-CD16/32 (93) were purchased from eBiosciences (San Diego, USA). Anti-BrdU (600-401-C29) was purchased from ThermoFisher. Paraformaldehyde (PFA) and 4′,6-diamidino-2-phenylindole (DAPI) were from Sigma-Aldrich. The IL-17 ELISA kit was purchased from eBiosciences.
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10

Immunofluorescence Imaging of Organelle Markers

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HeLaClover-PRP4K cells were plated onto glass coverslips in a 6-well plate and treated overnight with 50 μm chloroquine (Sigma) or stimulated with EGF as above. Cells were fixed with 4% paraformaldehyde in PBS for 10 min at room temperature, permeabilized with 0.1% Triton X-100 in PBS for 10 min and immunolabeling was carried out as previously described.10 (link) Fluorescent images were captured with a Zeiss Cell Observer spinning-disk microscope (Intelligent Imaging Innovations, 3i, Boulder, CO, USA) using a 1.4 NA 63 × immersion oil objective lens. Images were processed using only linear adjustments in Adobe Photoshop CS5 and Slidebook (3i) software, which was also used for the analysis of mean fluorescence intensity of immunostaining.
Antibodies used for immunofluorescence were used at the manufacturers recommended dilution unless otherwise noted, and include anti-GFP (Abcam, Toronto, ON, Canada, ab13970) (1:2000 dilution), anti-EEA1 (Cell Signaling, #3288) (1:100 dilution), anti-Rab5 (Cell Signaling, #3547) (1:200 dilution), anti-Rab7 (Cell Signaling, #9367) (1:100 dilution), anti-p62 (Cell Signaling, #7695) (1:400 dilution), anti-LAMP2 (Abcam, ab25631) (1:200 dilution), and anti-p-EGFR (Tyr1068) (Cell Signaling, #3777) (1:800 dilution).
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