Blockade of estrogen-stimulated proliferation by a constitutively-active prolactin receptor having lower expression in invasive ductal carcinoma.

Blockade of estrogen-stimulated proliferation by a constitutively-active prolactin receptor having lower expression in invasive ductal carcinoma.
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通过在浸润性导管癌中表达较低的组成型活性催乳素受体来阻断雌激素刺激的增殖。

DOI:
10.1016/j.canlet.2014.12.031
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发表时间:
2015
期刊:
影响因子:
9.7
通讯作者:
A. Walker
A. Walker
中科院分区:
医学1区
文献类型:
--
作者:
Kuang;Dunyong Tan;Kuan;A. Walker

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由于选择性剪接PRL受体(PRLR)的不同作用以及PRL和雌激素信号之间的串扰,全面了解催乳素(PRL)在乳腺癌中的作用是复杂的。在PRLRs中,短形式1b(SF1b)抑制PRL刺激的细胞增殖。除了配体依赖的PRLRs外,自然会出现缺少胞外区S2区域(ΔS2)的结构性活性变种。ΔS2版本的SF1b(ΔS2SF1b)的表达分析显示,在组织学正常的邻近组织中的表达高于浸润性导管癌。为了确定ΔS2SF1b的功能,建立了可诱导表达的T47D乳腺癌细胞系。ΔS2SF1b的诱导可阻断雌激素刺激的细胞增殖。与完整的SF1b不同,ΔS2SF1b的诱导对PRL介导的Stat5a的激活没有影响。然而,诱导抑制了雌激素对雌激素受体α的丝氨酸-118磷酸化、AKT的丝氨酸-473磷酸化、GSK3β的丝氨酸-9磷酸化和c-myc表达的刺激作用。此外,ΔS2SF1b的诱导增加了细胞周期抑制蛋白p21的表达。因此,ΔS2SF1b的表达增加,就像我们证明的选择性PRLR调制子S179D PRL所发生的那样,将创造一种生理状态,在这种状态下,雌激素刺激的增殖受到抑制,但对催乳素的分化反应保持不变。
A comprehensive understanding of prolactin's (PRL's) role in breast cancer is complicated by disparate roles for alternatively-spliced PRL receptors (PRLR) and crosstalk between PRL and estrogen signaling. Among PRLRs, the short form 1b (SF1b) inhibits PRL-stimulated cell proliferation. In addition to ligand-dependent PRLRs, constitutively-active varieties, missing the S2 region of the extracellular domain (ΔS2), naturally occur. Expression analysis of the ΔS2 version of SF1b (ΔS2SF1b) showed higher expression in histologically-normal contiguous tissue versus invasive ductal carcinoma. To determine the function of ΔS2SF1b, a T47D breast cancer line with inducible expression was produced. Induction of ΔS2SF1b blocked estrogen-stimulated cell proliferation. Unlike intact SF1b, induction of ΔS2SF1b had no effect on PRL-mediated activation of Stat5a. However induction inhibited estrogen's stimulatory effects on serine-118 phosphorylation of estrogen receptor α, serine-473 phosphorylation of Akt, serine-9 phosphorylation of GSK3β, and c-myc expression. In addition, induction of ΔS2SF1b increased expression of the cell cycle-inhibiting protein, p21. Thus, increased expression of ΔS2SF1b, such as we demonstrate occurs with the selective PRLR modulator, S179D PRL, would create a physiological state in which estrogen-stimulated proliferation was inhibited, but differentiative responses to PRL were maintained.
DOI: 10.1210/endo.138.9.5489
发表时间: 1997-09
期刊: Endocrinology
影响因子: 4.8
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