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Case Reports |
Istituto G. Gaslini, Universita degli Studi di Genova, Italy.
We describe a 9-year-old boy with Wiskott-Aldrich syndrome and IgM-rheumatoid factor-positive arthritis who presented expansion of two distinct subsets (one CD8dim and the other CD8-) of large granular lymphocytes. Natural killer activity against the K-562 cell line was absent. An increased percentage of CD5+ B cells was also observed. Since patients with Wiskott-Aldrich syndrome are at risk of developing autoimmune disorders - conditions in which increased CD5+ B cells have been observed - the high percentage of CD5+ B cells together with the presence of IgM-rheumatoid factor and anti-platelet antibodies may represent an early manifestation of an autoimmune process. The possible relationship between CD5+ B cells and large granular lymphocyte expansion is discussed.
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J. S. Orange, N. Ramesh, E. Remold-O'Donnell, Y. Sasahara, L. Koopman, M. Byrne, F. A. Bonilla, F. S. Rosen, R. S. Geha, and J. L. Strominger Wiskott-Aldrich syndrome protein is required for NK cell cytotoxicity and colocalizes with actin to NK cell-activating immunologic synapses PNAS, August 20, 2002; 99(17): 11351 - 11356. [Abstract] [Full Text] [PDF] |
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