CD43 DIMINISHES SUSCEPTIBILITY TO T LYMPHOCYTE-MEDIATED CYTOLYSIS

被引:0
|
作者
MCFARLAND, TA [1 ]
ARDMAN, B [1 ]
MANJUNATH, N [1 ]
FABRY, JA [1 ]
LIEBERMAN, J [1 ]
机构
[1] TUFTS UNIV NEW ENGLAND MED CTR,DEPT MED,DIV HEMATOL ONCOL,BOSTON,MA 02111
来源
JOURNAL OF IMMUNOLOGY | 1995年 / 154卷 / 03期
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中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
CD43 is a major membrane sialoglycoprotein expressed by cells of hematopoietic origin. One property of CD43 is its ability to interfere with heterotypic and homotypic cellular adhesion. To determine whether CD43 expression can affect cell functions requiring intercellular adhesion, we compared a CD43-positive human T cell line (CEM) and its CD43-negative counterpart derived by gene targeting for susceptibility to cell-mediated lysis. CD43-negative CEM cells were more susceptible than CD43-positive cells to lysis by allospecific T cell lines derived from several donors. Induction of CD43 expression on transfected HeLa cells also imparted resistance to lectin-mediated lysis by a CD8(+) T cell clone. The effect of CD43 expression on reducing susceptibility to lysis was more pronounced in short-term cytotoxicity assays and tended to disappear as the time of contact between the effector cell and its target increased. The enhanced susceptibility of CD43-negative cells to lysis was not associated with increased expression of adhesion molecules known to mediate antigen-independent cellular adhesion. Sialic acid residues on CD43 contributed to the CD43 protective effect. These results suggest that either diminished CD43 expression or incomplete sialylation may render hematopoietic cells more susceptible to T lymphocyte-mediated cytolysis.
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页码:1097 / 1104
页数:8
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