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  • Spontaneous apoptosis in lymphocytes from patients with Wiskott-Aldrich syndrome: correlation of accelerated cell death and attenuated bcl-2 expression.

    Blood. 94(11):3872-82. December 1, 1999. View on PubMed.
  • Authors

    Rawlings SL, Crooks GM, Bockstoce D, Barsky LW, Parkman R, and Weinberg KI
  • Abstract

    Wiskott-Aldrich syndrome (WAS) is an X-linked recessive disorder characterized by thrombocytopenia, eczema, and a progressive deterioration of immune function. WAS is caused by mutations in an intracellular protein, WASP, that is involved in signal transduction and regulation of actin cytoskeleton rearrangement. Because immune dysfunction in WAS may be due to an accelerated destruction of lymphocytes, we examined the susceptibility to apoptosis of resting primary lymphocytes isolated from WAS patients in the absence of exogenous apoptogenic stimulation. We found that unstimulated WAS lymphocytes underwent spontaneous apoptosis at a greater frequency than unstimulated normal lymphocytes. Coincident with increased apoptotic susceptibility, WAS lymphocytes had markedly attenuated Bcl-2 expression, whereas Bax expression did not differ. A negative correlation between the frequency of spontaneous apoptosis and the level of Bcl-2 expression was demonstrated. These data indicate that accelerated lymphocyte destruction by spontaneous induction of apoptosis may be one pathogenic mechanism by which the progressive immunodeficiency in WAS patients develops.

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