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mAbs used in these studies (and their sources) include the anti-CD11b (B-1 integrin subunit) clones Leu 15 (Becton Dickinson Biosciences, San Jose, CA), OKM1 and OKM10 [American Type Culture Collection (ATCC), Rockville, MD], and MO1; the anti-CD15s clone CSLEX-1 (both obtained from Beckman Coulter, Fullerton, CA), the 3G8 clone directed against the Fc receptor, CD16; the ML5 anti-CD24 clone (both from Pharmingen, San Diego, CA); and the dft1 (Sigma, St. Louis, MO) and Ig10 (Pharmingen) anti-CD43 clones. Anti-CD162 (PSGL-1) mAbs used included KPL-1 (from the laboratory of G.S.K.), PL1 (Ancell, Bayport, MN), and PL2 (Beckman Coulter). Antibodies to selectin used were as follows: for P-selectin (CD62P), AC1.2 (mAb; Becton Dickinson) and polyclonal IgG (Santa Cruz Biotechnology, Santa Cruz, CA); for L-selectin (CD62L), clone SK11; and for E-selectin (CD62E), clone H18/7 (both from Becton Dickinson).
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16
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85069109854
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note
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Fluorescent HGE was prepared from infected HL60 cultures incubated with the vital fluorescent dye Cell Tracker Green (Molecular Probes, Eugene, OR) (C. Nelson, M. Herron, J. L. Goodman, unpublished data). HGE bacteria were liberated by passage through a 25-gauge needle and washed twice in phosphate-buffered saline (PBS). Fluorescent HGE from 1 to 2 million infected HL60 was incubated for 30 min with 250,000 target cells at 22°C in 25 μl of PBS. Binding was stopped, and the cells and bacteria were fixed by addition of 0.25 ml of 1% paraformaldehyde in PBS. Cell surface binding of labeled HGE was assessed by FACS analysis of the mean cellular fluorescence of 5000 cells and expressed as the percentage of a control with no antibodies added, with subtraction of nonspecific background determined with a baseline control in which binding had been stopped by fixation immediately upon addition of HGE to target cells. This method was shown to provide results that linearly correlate with binding as determined by direct visualization by IFA.
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The derivation of the BJAB cells stably expressing FucT-VII is described [A. J. Wagers, L. M. Stoolman, R. Kannagi, R. Craig, G. S. Kansas, J. Immunol. 159, 1917 (1997)]. BJAB and BJAB/FucT-VII cells were each stably transfected with PSGL-1 cDNA by electroporation as described [K. R. Snapp et al., J. Cell. Biol. 142, 263 (1998)], and clones expressing comparable amounts of PSGL-1, FucT-VII, or both were generated by limiting dilution and identified by FACS analysis with the KPL-1 and HECA-452 mAbs.
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x) were preincubated in 100 μl of RPMI medium for 1 hour at 37°C either alone or with enzyme (0.06 to 0.24 mg/ml) added. The cells were then washed twice in fresh medium without enzyme, and IFA binding assays were performed as described (12).
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85069118883
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note
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This work was supported by grants from the NIH (RO1AI40952, to J.L.G.), from the American Cancer Society (RPG-96-097 CSM to G.S.K.), and from the Illinois Chapter of the American Cancer Society (99-47, to K.R.S.). G.S.K. is an Established Investigator of the American Heart Association. We thank J. Ernst, J. Farber, and B. Weston for helpful comments.
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