HNF1 activates transcription of the human gene for insulin-like growth factor binding protein-1.

HNF1 activates transcription of the human gene for insulin-like growth factor binding protein-1.
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HNF1 激活人类胰岛素样生长因子结合蛋白 1 基因的转录。

DOI:
10.1089/dna.1993.12.283
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发表时间:
1993
影响因子:
3.1
通讯作者:
Suwanichkul,A
Suwanichkul,A
中科院分区:
生物学4区
文献类型:
--
作者:
Powell,DR;Suwanichkul,A

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胰岛素样生长因子结合蛋白-1 (IGFBP-1) 主要在肝脏、肾脏和子宫中表达。人 HEP G2 肝癌细胞中的基础 IGFBP-1 启动子活性取决于结合肝核因子 1 (HNF1) 的近端启动子元件,HNF1 是一种蛋白质,可能是调节肝脏和肾脏中许多基因表达的重要因子。为了测试 HNF1 是否激活 IGFBP-1 转录,将 HNF1 表达载体和 IGFBP-1 启动子/氯霉素乙酰转移酶报告基因构建体瞬时共转染 HEP G2 细胞和 HeLa 细胞。 HNF1 增加了 HEP G2 和 HeLa 细胞中 IGFBP-1 启动子的活性。 HeLa 细胞中的凝胶迁移率测定和额外转染表明,表达的全长和羧基末端截短形式的 HNF1 均可结合 IGFBP-1 启动子的 HNF1 顺式元件;然而,显着的反式/ts 激活仅在全长 HNF1 蛋白存在时发生,类似于这两种 HNF1 形式和白蛋白启动子的过去经验。进一步的研究表明,相对于天然启动子,含有对 HNF1 具有高亲和力或低亲和力的突变的 IGFBP-1 启动子构建体对 HNF1 表达的反应分别具有增加或减少的活性。这些研究表明,HNF1 和/或相关蛋白在 IGFBP-1 的肝脏(也许还有肾脏)表达中发挥作用。
Insulin-like growth factor binding protein-1 (IGFBP-1) is expressed primarily in the liver, kidney, and uterus. Basal IGFBP-1 promoter activity in human HEP G2 hepatoma cells is dependent upon a proximal promoter element that binds hepatic nuclear factor 1 (HNF1), a protein that is likely to be an important factor regulating the expression of many genes in liver and kidney. To test whether HNF1 activates IGFBP-1 transcription, HEP G2 cells and HeLa cells were cotransfected transiently with HNF1 expression vectors and with IGFBP-1 promoter/chloramphenicol acetyltransferase reporter gene constructs. HNF1 increased IGFBP-1 promoter activity in both HEP G2 and HeLa cells. Gel mobility-shift assays and additional transfections in HeLa cells showed that expressed full-length and carboxy-terminal truncated forms of HNF1 could each bind the HNF1ciselement of the IGFBP-1 promoter; however, significanttrans/ts-activation only occurred in the presence of the full-length HNF1 protein, similar to past experience with these two HNF1 forms and the albumin promoter. Further studies showed that IGFBP-1 promoter constructs containing mutations with high or low affinity for HNF1 responded to HNF1 expression with increased or decreased activity, respectively, relative to the native promoter. These studies suggest that HNF1 and/or related proteins play a role in hepatic, and perhaps also renal, expression of IGFBP-1.
培养的人胎肝外植体中生长激素独立的胰岛素样生长因子结合蛋白(BP-28)的调节。
DOI: 10.1210/jcem-69-2-246
发表时间: 1989
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发表时间: 1991
影响因子: 5.3
作者:
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发表时间: 1989
期刊: Molecular endocrinology (Baltimore, Md.)
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作者:
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DOI: --
发表时间: 1987
期刊: EMBO Journal
影响因子: 11.4
作者:
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