Induction of apoptosis by the retinoid inducible growth regulator RIG1 depends on the NC motif in HtTA cervical cancer cells.

Induction of apoptosis by the retinoid inducible growth regulator RIG1 depends on the NC motif in HtTA cervical cancer cells.
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DOI:
10.1186/1471-2121-10-15
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发表时间:
2009-02-26
期刊:
影响因子:
--
通讯作者:
Jiang SY
Jiang SY
中科院分区:
生物3区
文献类型:
--
作者:
Tsai FM;Shyu RY;Lin SC;Wu CC;Jiang SY

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类视黄醇诱导基因 1 (RIG1),也称为他扎罗汀诱导基因 3 或视黄酸受体应答基因 3,是一种生长调节剂,可诱导细胞凋亡和分化。 RIG1 属于 NC 蛋白家族。本研究调查了与 RIG1 介导的细胞死亡和凋亡相关的功能域和关键氨基酸。使用增强型绿色荧光蛋白(EGFP)标记的RIG1变体,NC结构域缺失的RIG1蛋白显着减少了RIG1诱导的细胞死亡,仅含有NC结构域的融合变体显着诱导HtTA宫颈癌细胞凋亡。在表达 N112C113 基序双(NC→FG)或三(NCR→FGE)突变 RIG1 变体的细胞中,EGFP-RIG1 诱导的细胞凋亡显着减少。使用十二肽,在表达野生型 RIG1111–123 或 Leu121 突变的 RIG1111–123:L→ C 肽的 HtTA 细胞中观察到核定位和深度细胞死亡,但仅在 NC 基序上双突变或三突变的肽,RIG1111–123:NC→FG 或 RIG1111–123:NCR→FGE,在细胞质中定位并不诱导细胞凋亡。 RIG1111-123 还诱导 A2058 黑色素瘤细胞凋亡,但不诱导正常人成纤维细胞凋亡。 NC 结构域,尤其是 NC 基序,在 RIG1 介导的促凋亡活性中起主要作用。 RIG1111-123十二肽表现出很强的促凋亡活性,具有作为抗癌药物的潜力。
Retinoid-inducible gene 1 (RIG1), also known as tazarotene-induced gene 3 or retinoic-acid receptor responder 3, is a growth regulator, which induces apoptosis and differentiation. RIG1 is classified into the NC protein family. This study investigated functional domains and critical amino acids associated with RIG1-mediated cell death and apoptosis. Using enhanced green fluorescence protein (EGFP)-tagged RIG1 variants, RIG1 proteins with deletion at the NC domain significantly decreased cell death induced by RIG1, and fusion variants containing only the NC domain significantly induced apoptosis of HtTA cervical cancer cells. The EGFP-RIG1-induced apoptosis was significantly decreased in cells expressing N112C113 motif double- (NC→FG) or triple- (NCR→FGE) mutated RIG1 variants. Using dodecapeptides, nuclear localization and profound cell death was observed in HtTA cells expressing wild type RIG1111–123 or Leu121-mutated RIG1111–123:L→ C peptide, but peptides double- or triple-mutated at the NC motif alone, RIG1111–123:NC→FG or RIG1111–123:NCR→FGE, were cytoplasmically localized and did not induce apoptosis. The RIG1111–123 also induced apoptosis of A2058 melanoma cells but not normal human fibroblasts. The NC domain, especially the NC motif, plays the major role in RIG1-mediated pro-apoptotic activity. The RIG1111–123 dodecapeptide exhibited strong pro-apoptotic activity and has potential as an anticancer drug.
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发表时间: 1998-12-08
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