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Chemotaxis of non‐compressed blood polymorphonuclear leukocytes from an adolescent with severe leukocyte adhesion deficiency
Author(s) -
Malawista Stephen E.,
de Boisfleury Chevance Anne,
Brown Eric J.,
Boxer Laurence A.,
Law S.K.A.
Publication year - 2003
Publication title -
american journal of hematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.456
H-Index - 105
eISSN - 1096-8652
pISSN - 0361-8609
DOI - 10.1002/ajh.10311
Subject(s) - leukocyte adhesion deficiency , cd18 , integrin , chemotaxis , immunology , adhesion , granulocyte , bacterial adhesin , antigen , biology , medicine , chemistry , flow cytometry , integrin alpha m , biochemistry , receptor , gene , virulence , organic chemistry
Abstract We have defined the defect in a child with severe leukocyte adhesion deficiency‐1 (LAD) as resulting from a single amino acid shift in CD18 (from a C to T mutation at position 533) that prevents heterodimerization with the CD11 antigens to produce β 2 integrins—the first reported patient homozygous for this defect. Although beset by frequent infections, the patient has survived to adolescence despite the lack of these important adhesion molecules. Consistent with his clinical course is the ability of his PMN to respond chemotactically in slide preparations, albeit with difficulty because of their poor purchase on substrate. The operant adhesins are unknown; his polymorphonuclear leukocytes (PMN) remain chemotactically responsive in the presence of antibodies to αvβ 3 and β 1 integrins and to integrin‐associated protein (IAP). These findings indicate that not all patients with severe LAD are candidates for early bone marrow transplantation. Am. J. Hematol. 73:115–120, 2003. © 2003 Wiley‐Liss, Inc.