TGF-beta inhibits growth and induces apoptosis in leukemic B cell precursors

被引:36
作者
Buske, C [1 ]
Becker, D [1 ]
FeuringBuske, M [1 ]
Hannig, H [1 ]
Wulf, G [1 ]
Schafer, C [1 ]
Hiddemann, W [1 ]
Wormann, B [1 ]
机构
[1] GERMAN PRIMATE CTR,GOTTINGEN,GERMANY
关键词
B cell precursor; TGF-beta; human; apoptosis; growth inhibition;
D O I
10.1038/sj.leu.2400586
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The uncontrolled proliferation of malignant lymphoblasts is the pathobiological hallmark in B cell precursor-ALL (BCP-ALL). Identification of inhibitory growth factors is of great importance for the understanding of growth control of leukemic B cell precursors and the development of novel therapeutic approaches in BCP-ALL. The aim of our study was the analysis of the effect of TGF-beta on cell survival and apoptosis of B cell precursors (BCP) from patients with acute lymphoblastic leukemia in vitro. Experiments were performed in a coculture system with cloned murine fibroblasts, which efficiently block spontaneous ex vivo apoptosis of BCP and thus allows the assessment of cytokine-induced growth inhibition. TGF-beta significantly reduced cell viability of highly purified, FACS isolated CD10(+)/CD19(+) leukemic BCP by a mean of 53% (P = 0.0001). The loss of cell viability was accompanied by a significant increase of apoptosis with a mean of 70% (P = 0.0028). The TGF-beta effect was blocked specifically by a monoclonal anti-TGF-beta antibody. Induction of apoptotic cell death by TGF-beta was not accompanied by reduction of bcl-2 protein expression. TGF-beta transcription was not detected in the leukemic pre-B cell line BLIN-1, but in the murine fibroblasts. The growth inhibitory effect of TGF-beta was not restricted to leukemic BCP. The cytokine also increased apoptosis of normal, highly purified BCP by a mean of 58%. The data identify TGF-beta as a potent growth inhibitory cytokine for leukemic BCP.
引用
收藏
页码:386 / 392
页数:7
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