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3 protocols using total btk

1

Obinutuzumab and Rituximab Signaling Analysis

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Obinutuzumab (GA101) was generously supplied by Hoffmann La Roche (Switzerland). RTX was purchased from Genentech Inc. (South San Francisco, CA, USA). Antibodies for flow cytometry, CD20-PE (Clone HI47), CD20-FITC (Clone HI47) and CD19-FITC (SJ25-C1), were obtained from Invitrogen (CA, USA). Western blot antibodies, phospho-PLC gamma2 (Tyr759, 150 KDa), total PLC gamma2 (150 KDa), phospho GSK3 Beta (Ser21/9, 46 KDa), total GSK3 Beta (46KDa), phospho BTK (Tyr223, 78KDa), total BTK (Clone D3H5, 77KDa), phospho Lyn (Tr507, 53, 56KDa) and total Lyn (C13F9,58KDa), phospho B- RAF (Ser445, 86KDa), total B- RAF (clone 55C6, 86KDa), phospho ERK1/2 (Thr202/Thyr204) (Clone D1.14.4E, 42, 44KDa), total ERK1/2 (42,44KDa), phospho LCK (Tyr505, 56KDa), total LCK (56KDa) and B-actin (clone D6A8, 45KDa) were obtained from Cell Signaling Technology (Danvers, MA, USA). CD20 (B9E9) antibody was obtained by Santa Cruz Biotechnology (Dallas, TX, USA). Annexin V: PE Apoptosis Detection Kit I was obtained from BD Biosciences (San Jose, CA, USA). Alamar blue cell viability reagent was purchased from Invitrogen (Grand Island, NY, USA). U0126 MEK1/2 inhibitor was purchased from Cell Signaling Technology (Danvers, MA, USA). PLC gamma2 and GSK3 Beta ON-TARGET plus siRNA were obtained from Dharmacon GE (Lafayette, CO, USA).
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2

Lysate Profiling of Myeloid-Derived Suppressor Cells

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MSC2 cells, murine MDSC, or human MDSC were lysed in RIPA buffer (Sigma, St. Louis, MO). Lysates were probed for phosphorylated BTK (p-BTK) (Cell Signaling, Danvers, MA), total BTK (Cell Signaling), total ITK (Cell Signaling), total Bmx (Epitomics, Eugene, OR) or GAPDH (Santa Cruz Biotechnologies, Dallas, TX) as previously described(23 (link)).
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3

Ibrutinib Inhibits BCR Signaling

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Jeko-1 and MCIR1 cells were incubated with vehicle or 1.0 μM ibrutinib (Chemitek) for 30 minutes, and subsequently stimulated for 30 minutes with 5ug/mL anti-IgA, anti-IgG and anti-IgM cocktail whilst still in the presence of ibrutinib. Cells were lysed in RIPA buffer, the lysates were resolved by SDS-PAGE, transferred to PVDF membranes, and probed with the following antibodies: phospho-BTK, total BTK, phospho-PLCγ2, total PLCγ2, phospho-AKT, total AKT, phospho-ERK1/2, and total ERK1/2 from Cell Signaling (Danvers, MA); and β-actin antibodies from Santa Cruz Biotechnology (Santa Cruz, CA). Images were developed either on a Li-COR imager or on X-ray films using SuperSignal kit.
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