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Chronic Lymphocytic Leukemia and Normal B-Cells

ZAP-70 is expressed by a subset of normal human B-lymphocytes displaying an activated phenotype

Abstract

The Syk family tyrosine kinase ZAP-70 is essential for normal T-cell development and signaling. Recently, leukemic cells from some patients with B-cell chronic lymphocytic leukemia (B-CLL) were shown to express ZAP-70. Owing to the prognostic value of B-CLL ZAP-70 expression, this phenotype may reflect intrinsic biological differences between the two subsets of disease. However, it remains unclear whether CLL-B cells aberrantly acquire ZAP-70 expression during the transformation process or whether ZAP-70 may be expressed under certain conditions in normal human B-lymphocytes. To discriminate between these two possibilities, we assessed ZAP-70 expression in normal human B-lymphocytes. Our data demonstrate that ZAP-70 is expressed in a subpopulation of tonsillar and splenic normal B-lymphocytes that express an activated phenotype. Furthermore, ZAP-70 expression can be induced in vitro upon stimulation of blood and tonsillar B cells. Finally, we show that phosphorylation of ZAP-70 occurs in tonsillar B cells with stimulation through the B-cell receptor. These results provide new insight into normal human B-cell biology as well as provide clues about the transformed cell in B-CLL.

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Acknowledgements

This work was supported in part by National Institute of Health Training Grant 5-T32-HL67742 (BTP).

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Correspondence to D F Jelinek.

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Nolz, J., Tschumper, R., Pittner, B. et al. ZAP-70 is expressed by a subset of normal human B-lymphocytes displaying an activated phenotype. Leukemia 19, 1018–1024 (2005). https://doi.org/10.1038/sj.leu.2403726

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