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MDCK2 and MDCKf3 cells (5) were cultured in Dulbecco's modified Eagle's medium (DMEM) (Gibco-BRL) with 10% fetal calf serum (FCS). Stable cell lines expressing hemagglutinin (HA)-epitope-tagged C1199Tiam1 or C580Tiam1 constructs (see Fig. 1C), or Myc-epitope-tagged RacV12 or RacN17, were generated by retroviral transduction. Construction, transfection, and production of viral vectors and amphotropic retroviruses containing the Tiaml and Rac cDNAs are described elsewhere (23).
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16
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15644372535
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note
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Cells were grown to confluency in 10-cm dishes, washed with ice-cold phosphate-buffered saline (PBS), and lysed in 0.5 ml of lysis buffer [50 mM tris-HCl (pH 7.4), 1% Triton X-100, 150 mM NaCl, 5 mM EDTA, 10 mM sodium fluoride, 0.1 mM sodium orthovanadate, 20 μM leupeptin, 20 μM aprotinin, and 1 mM 4-(2-amino-ethyl)-benzenesulfonyl fluoride hydrochloride (Boehringer)]. After 10 min on ice, cell lysates (Triton-soluble fraction) were collected, and the remaining cell fraction was collected in the same buffer containing 1 % sodium deoxycholate and 0.1% SDS (RIPA fraction).Tiam1 was immunoprecipitated with the antiserum to Tiam 1 (anti-C16, Santa Cruz) (1 μg per immunoprecipitate) and analyzed by SDS-polyacrylamide gel electrophoresis and immunoblotting (12).
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17
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15644375702
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note
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4 cells per well). Endogenous Tiam 1 was visualized with the antibody to the DH domain (1:100 in PBS) (2) followed by incubation with biotin-labeled mouse antiserum to rabbit immunoglobulin and fluorescein isothiocyanate (FITQ-labeled streptavidin (Zymed). The staining pattern was recorded with a charge-coupled device camera system.
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19
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4 cells per well in a 12-well plate) were grown for 72 hours in the presence of control antibody or the DECMA-1 antibody (12 μg/ml). Medium and antibodies were replaced every 24 hours. HGF (10 ng/ml) was added for the last 24 hours; then the cells were fixed and processed for immunocytochemistry.
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23
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Cells were grown to confluency and collected in PBS with calcium and magnesium. Cells were pipetted 30 times with a 5-ml pipette and then photographed. The extent of cell dissociation was quantified by counting the number of cell clumps (particles) (Np) and the total number of cells (Nc) (1000 to 2000 cells per different cell line) on the photographs and is represented by the ratio Np/Nc [H. Takeda et al., J. Cell Biol. 131, 1839 (1995)].
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We thank M. Mareel for providing MDCK2 and MDCKf3 cells, G. Nolan for the LZRS vector and packaging cells, A. Hall for the RacV12 construct, I. Weimar for recombinant HGF, N. Ong for photographs, and F. van Leeuwen and E. Sander for discussions. Supported by grants from the Dutch Cancer Society to J.G.C.
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