Discordant expression of selectin ligands and sialyl Lewis x–related epitopes on murine myeloid cells

Blood - Tập 100 Số 13 - Trang 4485-4494 - 2002
M Kobzdej1,2, Anne Leppänen1,2, V. Ramachandran1,2, Richard D. Cummings1,2, Rodger P. McEver1,2
1From the Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation
2From the Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation; and the Department of Biochemistry and Molecular Biology, Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK.

Tóm tắt

Murine leukocytes are thought to express α2-3-sialylated and α1-3-fucosylated selectin ligands such as sialyl Lewis x (sLex), although monoclonal antibodies (mAbs) to sLex or Lex reportedly do not bind to murine leukocytes. We observed that P- and E-selectin bound to pronase-sensitive ligands on murine monocytic WEHI-3 cells and murine neutrophils, indicating that the ligands for both selectins are glycoproteins. CSLEX-1, HECA-452, and other widely used mAbs to sLex and Lex did not bind to WEHI-3 cells and bound at very low levels to murine neutrophils. Only the anti-sLex mAbs 2H5 and KM93, which also recognize nonfucosylated glycans, bound to WEHI-3 cells. 2H5 and KM93 bound to pronase-resistant structures, indicating that the mAbs did not identify selectin ligands. Treatment of WEHI-3 cells with glycosidases or chlorate demonstrated that sialic acid modifications, α1-3-galactosylation, or sulfation did not mask epitopes for mAbs to sLex or Lex. Compared to human promyelocytic HL-60 cells, WEHI-3 cells and murine neutrophils expressed low α1-3-fucosyltransferase activities. Consistent with very low endogenous fucosylation, forced fucosylation of intact WEHI-3 cells or murine neutrophils by exogenous α1-3-fucosyltransferase FTVI and GDP-fucose created many new epitopes for anti-sLexmAbs such as HECA-452 and CSLEX-1. Nevertheless, forced fucosylation of intact cells did not significantly augment their ability to bind to fluid-phase P- or E-selectin or to roll on immobilized P- or E-selectin under flow. These data suggest that murine myeloid leukocytes fucosylate only a few specific glycans, which interact preferentially with P- and E-selectin.

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Blood

Tập 100 Số 13

4485-4494

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