Interaction with RXR is necessary for NPM-RAR-induced myeloid differentiation blockade.

Interaction with RXR is necessary for NPM-RAR-induced myeloid differentiation blockade.
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DOI:
10.1016/j.leukres.2013.09.024
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发表时间:
2013-12
期刊:
影响因子:
2.7
通讯作者:
Redner, Robert L.
Redner, Robert L.
中科院分区:
医学3区
文献类型:
--
作者:
Rush, Elizabeth A.;Pollock, Sheri L.;Abecassis, Irina;Redner, Robert L.

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t(5; 17)(q35; q21)APL变体导致连接核磷蛋白(NPM)的N-末端与视黄酸受体α(RAR)的C-末端的融合蛋白的表达。我们以前已经表明,NPM-RAR能够结合DNA作为同源二聚体或异源二聚体与RXR。为了确定NPM-RAR/RXR相互作用的生物学意义,我们开发了两种NPM-RAR突变体,其显示出显著降低的结合RXR的能力。与NPM-RAR相比,表达NPM-RAR突变体的U937亚克隆显示出对维生素D3/TGF β诱导的分化的显著更少的抑制。这些结果支持RXR相互作用对于NPM-RAR介导的髓样成熟停滞是必需的这一假设。
The t(5;17)(q35;q21) APL variant results in expression of a fusion protein linking the N-terminus of nucleophosmin (NPM) to the C-terminus of the retinoic acid receptor alpha (RAR). We have previously shown that NPM-RAR is capable of binding to DNA either as a homodimer or heterodimer with RXR. To determine the biological significance of NPM-RAR/RXR interaction, we developed two mutants of NPM-RAR that showed markedly diminished ability to bind RXR. U937 subclones expressing the NPM-RAR mutants showed significantly less inhibition of vitamin D3/TGFbeta-induced differentiation, compared with NPM-RAR. These results support the hypothesis that RXR interaction is necessary for NPM-RAR-mediated myeloid maturation arrest.
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