Chronic lymphocytic leukemia B cells are resistant to the apoptotic effects of transforming growth factor-beta - PubMed (original) (raw)
. 1997 Feb 1;89(3):941-7.
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- PMID: 9028325
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Chronic lymphocytic leukemia B cells are resistant to the apoptotic effects of transforming growth factor-beta
R S Douglas et al. Blood. 1997.
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Abstract
Chronic lymphocytic leukemia (CLL) is the most common leukemia of the western world and is characterized by a slowly progressing accumulation of clonal CD5+ B cells. Our laboratory has investigated the role of transforming growth factor-beta (TGF-beta) and interleukin-4 (IL-4) in the pathogenesis of B-cell expansion in CLL. In vitro addition of TGF-beta did not increase spontaneous apoptosis of B cells from most CLL patients, as determined using the TUNEL method, compared with a twofold increase observed in cultures of normal B cells. There was similar expression of TGF-beta type II receptors on both CLL B cells and normal B cells. In contrast to apoptosis, CLL B-cell proliferation was variably inhibited with addition of TGF-beta. In vitro addition of IL-4, previously reported to promote CLL B-cell survival, dramatically reduced spontaneous apoptosis of CLL B cells compared with normal B cells. CLL B-cell expression of IL-4 receptors was increased compared to normal B cells. Thus, our results show aberrant apoptotic responses of CLL B cells to TGF-beta and IL-4, perhaps contributing to the relative expansion of the neoplastic clone.
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