The BH3-only protein Puma plays an essential role in p53-mediated apoptosis of chronic lymphocytic leukemia cells.

Abstract:

:The purpose of this study was to explore the characteristics and functions of BH3-only proteins Puma, Noxa and Bim in the prognosis, therapy and drug resistance of chronic lymphocytic leukemia (CLL). Puma, Noxa and Bim mRNAs were evaluated by real-time quantitative reverse transcriptase-polymerase chain reaction, and correlations between their expression levels and CLL prognostic markers were analyzed. Primary CLL samples were treated in vitro with fludarabine to investigate the role of Puma, Noxa and Bim in the response to chemotherapeutic drugs which act through activation of the p53 pathway. We found that a low expression level of Puma was associated with some markers of poor prognosis. However, the level of Noxa or Bim was not different in patients with CLL with variant clinical features and prognostic factors. Puma expression was up-regulated after fludarabine treatment in primary CLL cells, but there was no significant difference for Noxa and Bim. Up-regulation of Puma occurred only in CLL cells with functional p53. CLL cells with p53 abnormalities were deficient in the activation of Puma by chemotherapeutics. These results suggest that a lack of Puma induction may contribute to the development of resistance to anticancer agents in CLL.

journal_name

Leuk Lymphoma

journal_title

Leukemia & lymphoma

authors

Zhu HJ,Liu L,Fan L,Zhang LN,Fang C,Zou ZJ,Li JY,Xu W

doi

10.3109/10428194.2013.787613

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

2712-9

issue

12

eissn

1042-8194

issn

1029-2403

journal_volume

54

pub_type

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