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2 protocols using ehmuc1

1

Quantification of Muc1 Protein Expression

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Muc1 test was purchased from Thermo Scientific (EHMUC1). A total of 1 × 107 cells of each type were harvested and washed 3x with PBS. Next, the cells were suspended in 400 μL of a lysis buffer made of 50 mM Tris buffer, 100 mM NaCl, and x1 of protease inhibitor cocktail (Thermo-Scientific cat.#7448). Protein extraction was performed by sonication using the QSONICA Q500 sonicator. Six five-second sonications were followed by a 30 s cooldown time. Sonication was performed on ice. Protein extract was centrifuged at 15,000 rpm (21,130× g) for 30 min at 4 °C. The supernatant was collected and stored on ice. Protein content was tested using the Bradford protocol. ELISA test was performed according to the manufacturer’s guidelines.
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2

Cell Line Characterization and MUC1 Quantification

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Detailed description can be found in Supplemental Materials and Methods for: cell line cultures conditions; antibodies and gRNA sequences used; MS instrument settings; in vivo PET imaging Cell lines, SILAC labeling, and reagents Human breast cancer cell lines SKBR3, BT474, BT549, and MDA-MB-231; human non-small cell lung cancer cell lines H292 and HCC827; and HEK-293T were obtained from American Type Culture Collection (ATCC). SUM149 cells were a gift from Prof. W.T.A. van der Graaf (Medical Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands). Stable isotope labeling of cell lines (SILAC) was done using RPMI or DMEM-high glucose media with normal Arg and Lys (light) or Arg 10 and Lys 8 (heavy) (Silantes). Human MUC1 shedding was measured using a standardized MUC1 human ELISA kit (EHMUC1; Thermo Scientific), mouse MUC1 was measured using a MUC1 mouse ELISA kit (E-EL-M2604; Elabscience). MUC1 has a reported serum half-life of ~7 days 47 . The following inhibitors were used: EGFR inhibitors erlotinib (LC Laboratories; Axon Medchem), gefitinib (Axon Medchem), lapatinib (LC Laboratories), afatinib (Tocris); JAK2 inhibitor BMS-911543 (Selleckchem); PI3K inhibitor BEZ235, AKT inhibitor MK2206, mTORC1/2 inhibitor everolimus, ERK inhibitor FR18024, MEK1 inhibitor AZD6244 (Axon Medchem).
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