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CUTTING EDGE |
Departments of
*
Pathology and Laboratory Medicine and
Medicine, University of British Columbia and Vancouver Hospital and Health Sciences Centre, Vancouver, British Columbia, Canada;
Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada; and
§
Department of Pathology and Laboratory Medicine, British Columbia’s Children’s Hospital, Vancouver, British Columbia, Canada
X-linked lymphoproliferative disease (XLP) is characterized by a selective immune deficiency to EBV. The molecular basis of XLP has been attributed to mutations of signaling lymphocytic activation molecule-associated protein, an intracellular molecule known to associate with the lymphocyte-activating surface receptors SLAM and 2B4. We have identified a single nucleotide mutation in SLAM-associated protein that affects the NK cell function of males carrying the mutated gene. In contrast to normal controls, both NK and lymphokine-activated killer cell cytotoxicity was significantly reduced in two XLP patients. In addition to decreased baseline cytotoxicity, ligation of 2B4 significantly augmented NK lytic function in normal controls but failed to enhance the cytotoxicity of NK cells from XLP patients. These findings suggest that association of SAP with 2B4 is necessary for optimal NK/lymphokine-activated killer cytotoxicity and imply that alterations in SAP/2B4 signaling contribute to the immune dysfunction observed in XLP.
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