Proliferative Activation of Quiescent Rat-lA Cells by AFosB

Proliferative Activation of Quiescent Rat-lA Cells by AFosB
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AFosB 对静止大鼠-1A 细胞的增殖激活

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通讯作者:
S. Oda
S. Oda
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作者:
S. Oda

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Fos 和 Jun 转录因子在静止细胞对血清或生长因子的增殖反应的正常过程中被诱导。我们已经证明,AFosB(FosB 的一种选择性剪接形式)在血清刺激的 Rat-IA 细胞中的形成速度与 FosB 一样快。尽管AFosB缺乏携带反式激活功能的FosB的C端区域,但是AFosB的组成型表达与FosB的表达一样转化Rat-1A细胞。 AFosB的转化能力表明AFosB可能导致静止细胞的增殖激活而不激活AP-1反应基因。为了解决这个问题,在 Rat-IA 细胞中将 FosB 或 AFosB 表达为与人雌激素受体 (ER) 配体结合域的融合蛋白。雌激素处理后,融合蛋白在细胞核中积累,并与 Jun 蛋白形成稳定的复合物。我们已经证明 ER-AFosB 或在较小程度上 ER-FosB 触发静止的 Rat-IA 细胞过渡 G1,启动 DNA 复制,并最终至少经历一次细胞分裂。由于ER-FosB而非ER-AFosB诱导AP-1反应性反式蛋白/溶基质素基因的表达,因此我们得出结论,FosB或AFosB的N端区域和DNA结合结构域本身具有调节细胞增殖的潜力,并且FosB的C端区域所携带的反式激活功能对于静止细胞的增殖激活不是必需的。
Fos and Jun transcription factors are induced during the normal course of the proliferative response of quiescent cells to serum or to growth factors. We have shown that AFosB, an alternatively spliced form of FosB, is formed as rapidly as FosB in serum-stimulated Rat-IA cells. Although AFosB lacks the C-terminal region of FosB carrying the transactivation function, constitutive expression of AFosB transforms Rat-lA cells as does expression of FosB. The transforming ability ofAFosB suggests that AFosB may lead to proliferative activation of quiescent cells without activating AP-1-responsive genes. To address this question, FosB or AFosB was expressed as a fusion protein with the ligand binding domain of the human estrogen receptor (ER) in Rat-IA cells. After estrogen treatment, the fusion protein accumulates in nuclei and forms stable complexes with Jun proteins. We have shown that ER-AFosB or to a lesser extent ER-FosB triggers quiescent Rat-IA cells to transit G1, initiate DNA replication, and ultimately undergo cell division at least once. Since ER-FosB, but not ER-AFosB, induced expression of the AP-1-responsive transin/stromelysin gene, we concluded that the N-terminal region and the DNA binding domain of FosB or AFosB itself have the potential to regulate cell proliferation and that the transactivation function carried by the C-terminal region of FosB is not essential for the proliferative activation of quiescent cells.
DOI: 10.1073/pnas.89.2.618
发表时间: 1992-01
影响因子: 11.1
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FosB 的转化需要 FosB2 中缺失的反式激活结构域,该结构域可以被异源激活结构域取代。
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