Differential Subcellular Distribution and Transcriptional Activity of ΣE3, ΣE4, and ΣE3–4 Isoforms of the Rat Estrogen Receptor-α

Differential Subcellular Distribution and Transcriptional Activity of ΣE3, ΣE4, and ΣE3–4 Isoforms of the Rat Estrogen Receptor-α
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大鼠雌激素受体-α ΣE3、ΣE4 和 ΣE3-4 异构体的差异亚细胞分布和转录活性

DOI:
10.1210/mend.15.6.0642
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发表时间:
2001
影响因子:
--
通讯作者:
P. Vernier
P. Vernier
中科院分区:
医学2区
文献类型:
--
作者:
C. Pasqualini;D. Guivarc'h;J. Barnier;B. Guibert;J. Vincent;P. Vernier

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ΣE3、ΣE4和ΣE3-4是天然存在的雌激素受体(ER)亚型,通过ERα初级转录本的差异剪接产生,并在胚胎大鼠垂体中大量表达。在转染全长ERα或其三个剪接变体与绿色荧光蛋白(GFP)融合的COS细胞中的研究显示,每种异构体的亚细胞定位不同。在没有雌二醇的情况下,全长ERα-GFP主要存在于细胞核中,并且ER α 3-GFP和ER α 4-GFP存在于细胞质和细胞核中,而ER α 3 -4-GFP主要存在于细胞质中。在激素处理后,全长ERα-GFP和ER β 3-GFP在细胞核内发生了显著的重新分布,从弥漫性到点状模式。与此相反,BLE 4-GFP和BLE 3 -4-GFP的分布不受影响。核分馏研究表明,全长ER-α和ER β 3显示出相同的诱导核基质的能力,而ER β 4似乎仍然松散地与功能核结合。
ΣE3, ΣE4, and ΣE3–4 are naturally occurring estrogen receptor (ER) isoforms, generated through differential splicing of the ERα primary transcript and abundantly expressed in embryonic rat pituitary. Studies in COS cells transfected with full-length ERα or its three splice variants fused to green fluorescent protein (GFP), revealed a different subcellular localization for each isoform. In the absence of estradiol, full-length ERα-GFP was predominantly nuclear, and ΣE3-GFP and ΣE4-GFP were present both in cytoplasm and nucleus, whereas ΣE3–4-GFP was predominantly cytoplasmic. Upon hormone treatment, a dramatic redistribution of full-length ERα-GFP and ΣE3-GFP, from a diffuse to punctate pattern, occurred within the nucleus. In contrast, the distribution of ΣE4-GFP and ΣE3–4-GFP was unaffected. Nuclear fractionation studies showed that full-length ER-α and ΣE3 displayed the same hormone-induced ability to tether to nuclear matrix, whereas nuclear ΣE4 appeared to remain loosely associated to functional nucle...
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