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5 protocols using mouse secondary antibodies

1

Immunoblotting Using Common Antibodies

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SDS–PAGE was performed on Bio-Rad Mini-PROTEAN systems using standard protocols. For immunostaining, proteins were transferred onto 0.2-µm nitrocellulose membranes (Amersham Protran). Immunoblots were probed with primary antibodies and goat secondary antibodies coupled to alkaline phosphatase, and developed in alkaline buffer in the presence of 5-bromo-4-chloro-3-indolylphosphate and nitro-blue tetrazolium. The anti-HA (HA-7 clone, Sigma Aldrich), anti-FLAG (M2 clone, Sigma Aldrich), anti-StrepII (Sigma Aldrich), anti VSV-G (Sigma Aldrich) and anti-5His (Sigma Aldrich) monoclonal antibodies, and mouse secondary antibodies (Millipore) were purchased as indicated.
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2

Western Blot Analysis Protocol

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SDS-PAGE was performed on Bio-Rad Mini-Protean systems using standard protocols with homemade 12.5% polyacrylamide gels. For immunostaining, proteins were transferred onto 0.2-μm nitrocellulose membranes (Amersham Protran) with a Mini-Trans Blot cell (Bio-Rad). The membrane was then saturated in 5% milk and probed with primary antibodies. Mouse secondary antibody coupled to alkaline phosphatase was added and developed in alkaline buffer in the presence of 5-bromo-4-chloro-3-indolylphosphate and nitroblue tetrazolium. The antihemagglutinin (HA) (HA-7 clone; Sigma-Aldrich), anti-Flag (M2 clone; Sigma-Aldrich), anti-StrepII (Sigma-Aldrich), anti-5His (Sigma-Aldrich) monoclonal antibodies, and mouse secondary antibodies (Millipore) were purchased as indicated.
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3

Immunoblotting Techniques for Protein Detection

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SDS-PAGE was performed on Bio-Rad Mini-PROTEAN ® systems using standard protocols. For immunostaining, proteins were transferred onto 0.2-µm nitrocellulose membranes (Amersham Protran). Immunoblots were probed with primary antibodies and goat secondary antibodies coupled to alkaline phosphatase, and developed in alkaline buffer in presence of 5-bromo-4-chloro-3indolylphosphate and nitro-blue tetrazolium. The anti-HA (HA-7 clone, Sigma Aldrich), anti-Flag (M2 clone, Sigma Aldrich), anti-StrepII (Sigma Aldrich), anti VSV-G (Sigma Aldrich) and anti-5His (Sigma Aldrich) monoclonal antibodies, and mouse secondary antibodies (Millipore) were purchased as indicated.
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4

Western Blot Analysis of hOE-MSC Proteins

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For analyses by western blotting, hOE-MSCs were collected by trypsination, counted and then centrifuged for 5 min at 300 g. Cell pellets were resuspended in 1× SDS loading buffer, heated at 95°C during 5 min, then each cell lysate was resolved by 8% SDS-PAGE and transferred onto a PVDF membrane (Thermo Scientific, Rockford, IL). After blocking membrane with 5% milk in PBS (Life Technologies, Gibco, Grand Island, NY) supplemented with 0.1% Tween-20 (Sigma-Aldrich, St. Louis, MO) (PBS-T), membrane was incubated at 4°C overnight with mouse monoclonal primary antibodies against IKAP diluted at 1:2000 (clone no 33, BD Biosciences, Franklin Lakes, NJ), anti-NOVA1 at 1:300 (cat. no WH0004857M7, Sigma-Aldrich, St. Louis, MO) or anti-β-actin at 1:10,000 (cat. no A2228, Sigma-Aldrich, St. Louis, MO) in 2.5% milk in PBS-T. Thereafter, membrane was then probed with mouse secondary antibodies diluted at 1:3500 (Sigma-Aldrich, St. Louis, MO) in 2.5% milk in PBS-T at room temperature for 45 min, and revealed by exposing pre-incubated membrane with ECL (ThermoScientific, Rockford, IL) using a G:BOX Chemi XT4 device (Syngene, Cambridge, UK). β-actin was used for normalization as the housekeeping protein.
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5

Western Blot Analysis of IKAP/hELP1

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Cell pellets were resuspended in 1X SDS loading buffer at 6x10 3 cells/µL, and then samples were heated at 95°C during 5 min. Thereafter, total protein from 10 µl of cell lysates were separated on 10% SDS-polyacrylamide gel electrophoresis and transferred to a PVDF membrane (Thermo Fisher Scientific, Rockford, IL). Membranes were blocked with 5% Milk in PBS supplemented with 0.1% Tween-20 (Sigma-Aldrich, St. Louis, MO) buffer for 1h at room temperature, and were then subsequently probed at 4°C overnight with mouse monoclonal anti-IKAP/hELP1 antibody diluted at 1:2000 (BD Biosciences, Franklin Lakes, NJ) in 2.5% Milk in PBST, followed by incubation with mouse secondary antibodies at 1:3500 (Sigma-Aldrich). As a control of equal protein loading, membranes were also probed with mouse anti-β-actin primary antibody used at 1:10000 (Sigma-Aldrich). Stained proteins were revealed by chemiluminescent detection using ECL detection kit (Thermo Fisher Scientific, Rockford, IL) on a G:BOX Chemi XT4 device (Syngene, Cambridge, UK).
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