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6 protocols using bis tris plus bolt gels

1

Western Blot Analysis of Signaling Pathways

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Harvested cell culture pellets were resuspended in protein lysis buffer (25mM HEPES pH 7,5; 0,3M NaCl; 1,5mM MgCl2; 2mM EDTA; 2mM EGTA; 1mM DTT; 1% Triton X-100; 10% Glycerol; phosphatase/protease inhibitor cocktail), incubated on ice (15min) and centrifuged (15min) at 4°C/13000 rpm. Tumour samples were additionally homogenized with a PreCellys in protein lysis buffer, prior to incubation on ice. Equal amounts of protein (Bradford quantification) were run on 4-12% Bis-Tris Plus Bolt gels (ThermoFisherScientific) and transferred to a nitrocellulose membrane with an iBlot dryblot system (ThermoFisherScientific). Membrane blocking (5% BSA/TBS-0,2%Tween) is followed by incubation with the appropriate primary antibodies and HRP-conjugated secondary antibody (Cell Signaling). Signals were detected by enhanced chemiluminescence (ThermoFisherScientific) on Amersham hyperfilm. Antibodies were from Cell Signaling Technology (P-FAK Y397, #8556; FAK, #13009; P-SRC Y416, #6943; SRC, #2123; P-AKT S473, #4060; AKT, #4691; P-ERK T202/Y204, #9106 (cell lines); P-ERK T202/Y204 #4370 (tumour lysates); ERK, #9102; BRAF, #9433; P-p38 T180/Y182, #4511; p38, #8690; PTEN, #9559)
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2

Western Blot Analysis of Signaling Pathways

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Harvested cell culture pellets were resuspended in protein lysis buffer (25mM HEPES pH 7,5; 0,3M NaCl; 1,5mM MgCl2; 2mM EDTA; 2mM EGTA; 1mM DTT; 1% Triton X-100; 10% Glycerol; phosphatase/protease inhibitor cocktail), incubated on ice (15min) and centrifuged (15min) at 4 C/13000 rpm. Tumour samples were additionally homogenized with a PreCellys in protein lysis buffer, prior to incubation on ice. Equal amounts of protein (Bradford quantification) were run on 4-12% Bis-Tris Plus Bolt gels (ThermoFisher-Scientific) and transferred to a nitrocellulose membrane with an iBlot dryblot system (ThermoFisherScientific). Membrane blocking (5% BSA/TBS-0,2%Tween) is followed by incubation with the appropriate primary antibodies and HRP-conjugated secondary antibody (Cell Signaling). Signals were detected by enhanced chemiluminescence (ThermoFisherScientific) on Amersham hyperfilm. Antibodies were from Cell Signaling Technology (P-FAK Y397, #8556; FAK, #13009; P-SRC Y416, #6943; SRC, #2123; P-AKT S473, #4060; AKT, #4691; P-ERK T202/Y204, #9106 (cell lines); P-ERK T202/Y204 #4370 (tumour lysates); ERK, #9102; BRAF, #9433; P-p38 T180/Y182, #4511; p38, #8690; PTEN, #9559)
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3

Western Blot Analysis of α7nAChR

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The protein content of lysed cells was quantified using the Bio-Rad Protein Assay which is based on the Bradford Method (Bio-Rad, USA). Protein was reduced and prepared for western analysis using the Bolt LDS sample buffer and Reducing agent, before 10 µg protein was loaded into each well of a 10% Bis–Tris Plus Bolt Gels (Thermo Fisher Scientific, USA). Gels were run for 60 min at 150 v using NP MES SDS running buffer (Thermo Fisher Scientific, USA) and transferred to Nitrocellulose membrane at 10 v for 60 min using NuPAGE transfer buffer (Thermo Fisher Scientific, USA). Membranes were blocked with 5% milk in TBST before overnight incubation with the primary antibodies at 4 °C. The anti-ɑ7nAChR was used at 1/300 (ab10096, Abcam), while anti-GAPDH was used at 1/10000 (ab9485, Abcam). Proteins were then detected using IRDye 800CW-labeled antibodies and visualized on the Odyssey system (LI-COR Biosciences, USA). ɑ7nAChR was assessed relative to the GAPDH protein loading control using Image Studio (LI-COR Biosciences, USA) which included blot background correction.
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4

Immunoblot Analysis of Cell Signaling

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Immunoblots were performed as described previously38 (link),77 (link). Briefly, cells were harvested and pellets were lysed and prepared via boiling for 15 min in 1X loading dye (50 mM Tris [pH 6.8], 100 mM DTT, 2% SDS, 0.1% bromophenol blue, 10% glycerol). Lysates were separated by SDS-PAGE on 10% Bis-Tris Plus Bolt gels (ThermoFisher) and transferred onto 0.45 µm nitrocellulose membrane. Membranes were blocked with 2% nonfat dry milk in 1X TBST (10 mM Tris [pH 8], 150 mM NaCl, 0.05% Tween-20), and detection of indicated proteins was carried out using the following antibodies: Aiolos (39293, Active Motif, 1:20,000), Bcl-6 (clone K112, BD Biosciences, 1:500), pSTAT5(Y694/9) (clone 47 BD Biosciences, 1:5000), STAT5 (clone (D206Y, Cell Signaling, 1:5000), β-Actin (GenScript, 1:15,000), Eomes (Abcam, 1:5,000) goat anti-mouse:HRP (Jackson Immunoresearch, 1:5,000-1:30,000), mouse anti-rabbit:HRP (Santa Cruz, 1:5000-1:20,000).
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5

Comprehensive Protein Extraction and Analysis

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Cells were lysed in RIPA buffer containing 150mM NaCl, 50mM Tris pH 8.0, 1% NP-40, 0.5% sodium deoxycholate and 0.1% SDS supplemented with protease inhibitors (Complete, Roche, Switzerland) and phosphatase inhibitor cocktails II and III (Sigma-Aldrich, U.S.A.). 10X reducing agent and 4X LDS sample buffer (NuPAGE™, Thermo-Fisher Scientific, U.S.A.) were added. Subsequently, the samples were boiled for 5 minutes and quickly centrifuged at 21,000 rcf. Proteins were quantified using the BCA Protein Assay Kit (Pierce, Thermo-Fisher Scientific, U.S.A.). Equal amounts of protein were subjected to SDS gel electrophoresis using 4–12% Bis-Tris Plus Bolt gels (Thermo-Fisher Scientific, U.S.A.) and 3-(N-morpholino) propanesulfonic acid (MOPS) buffer, followed by Western blotting. Western blotting was performed using antibodies from Cell Signaling (MA, U.S.A.) against total JAK3 (3775S), phospho-JAK3 (Tyr980/981, 5031S), STAT5 (9363S), phospho-STAT5 (Tyr694, 9351S), p44/42 MAPK (Erk1/2, 137F5, 4695S), P-p44/p42 MAPK (T202/Y204, 4370S), AKT (pan, C67E7, 4691L), phospho-AKT (S473, D9E, 4060L), GAPDH and antibody from Santa Cruz Biotechnology Inc. (U.S.A.) against HSP90 α/β (f-8, SC-13119). For the western blotting results representative examples of at least two independent experiments are reported.
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6

CTIP2 Protein Detection in Aortic Tissue

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Frozen aortic tissues were homogenised using TissueLyser LT (QIAGEN) and
protein lysates were extracted in NE-PER nuclear and cytoplasmic extraction
buffers (ThermoFisher Scientific) containing protease inhibitors (Calbiochem).
Full-length CTIP2 expressed in a pcDNA3.1 vector and transfected into HEK293T
cells was used as a positive control for the antibody and empty vector
transfected into HEK293T cells was used as a negative control. Cells were lysed
using RIPA buffer and protein concentrations were determined with the PierceTM
BCA protein assay (ThermoFisher Scientific). Protein lysates (10ug) were
incubated a Laurel DuodecylSulfate (LDS) sample loading buffer and Bolt®
sample reducing agent (ThermoFisher Scientific) before loading and separation by
SDS-gel electrophoresis in 4-12% gradient Bis-Tris Plus Bolt® gels
(ThermoFisher Scientific) at 200V for 30 min. They were transferred to 0.22
μM nitrocellulose membrane (ThermoFisher Scientific) using the iBlot2 dry
blotting system (ThermoFisher Scientific) and blocked with 5% (wt/vol) milk in
TBS buffer then incubated with primary antibodies in TBS-Tween (0.1% Tween 20)
for 16 h at 4°C. Secondary antibodies were incubated in TBS-Tween for 1 h
at RT in the dark. Membranes were washed in TBS-Tween 3X for 15 min between
primary and secondary antibody incubations and visualized using the LI-COR
Odyssey system.
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