Acidic leucine-rich nuclear phosphoprotein 32 family member B (ANP32B) contributes to retinoic acid-induced differentiation of leukemic cells.

Acidic leucine-rich nuclear phosphoprotein 32 family member B (ANP32B) contributes to retinoic acid-induced differentiation of leukemic cells.
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酸性富含亮氨酸的核磷蛋白 32 家族成员 B (ANP32B) 有助于视黄酸诱导白血病细胞分化。

DOI:
10.1016/j.bbrc.2012.06.025
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发表时间:
2012-07
期刊:
Biochem Biophys Res Commun
影响因子:
--
通讯作者:
Wang, Li-Shun
Wang, Li-Shun
中科院分区:
其他
文献类型:
--
作者:
Zhang, Fei-Fei;Wu, Zhao-Xia;Han, Bin;Wang, Li-Shun

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富含亮氨酸的酸性核磷蛋白32B(ANP32B)是一个保守的核蛋白超家族成员,其功能尚不清楚。在我们以前的工作中,ANP32B被确定为caspase-3的新的直接底物,并作为白血病细胞凋亡的负调控因子。在这项工作中,我们首次证明了在全反式维甲酸(ATRA)诱导白血病细胞分化过程中ANP32B表达下调。特异性shRNA下调ANP32B的表达可促进ATRA诱导的白血病细胞分化,而异位表达ANP32B则抑制其诱导的白血病细胞分化,表明ANP32B对白血病细胞的分化有抑制作用。此外,荧光素酶报告分析表明,ANP32B可能通过抑制视黄酸受体(RAR)α的全反式维甲酸依赖转录活性而发挥这一作用。这些数据将为理解ANP32B蛋白的生物学功能提供新的见解。
The acidic leucine-rich nuclear phosphoprotein 32B (ANP32B) is a member of a conserved superfamily of nuclear proteins whose functions are largely unknown. In our previous work, ANP32B was identified as a novel direct substrate for caspase-3 and acted as a negative regulator for leukemic cell apoptosis. In this work, we provided the first demonstration that ANP32B expression was down-regulated during differentiation induction of leukemic cells by all-trans retinoic acid (ATRA). Knockdown of ANP32B expression by specific shRNA enhanced ATRA-induced leukemic cell differentiation, while ectopic expression of ANP32B attenuated it, indicating an inhibitory role of ANP32B against leukemic cell differentiation. Furthermore, luciferase reporter assay revealed that ANP32B might exert this role through inhibiting the ATRA dependent transcriptional activity of retinoic acid receptor (RARα). These data will shed new insights into understanding the biological functions of ANP32B protein.
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