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Volumn 278, Issue 5342, 1997, Pages 1464-1466

Inhibition of invasion of epithelial cells by Tiam1-Rac signaling

Author keywords

[No Author keywords available]

Indexed keywords

GUANINE NUCLEOTIDE EXCHANGE FACTOR; GUANOSINE TRIPHOSPHATASE; RAC PROTEIN; RAS PROTEIN; TIAM 1 PROTEIN; UNCLASSIFIED DRUG;

EID: 0030698191     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.278.5342.1464     Document Type: Article
Times cited : (395)

References (33)
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    • note
    • 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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    • 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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    • 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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    • note
    • 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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