MAP Kinase Phosphatase-1 Gene Transcription in Rat Neuroendocrine Cells Is Modulated by a Calcium-sensitive Block to Elongation in the First Exon*

MAP Kinase Phosphatase-1 Gene Transcription in Rat Neuroendocrine Cells Is Modulated by a Calcium-sensitive Block to Elongation in the First Exon*
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大鼠神经内分泌细胞中的 MAP 激酶磷酸酶-1 基因转录受到钙敏感阻断对第一个外显子延伸的调节*

DOI:
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发表时间:
2001
影响因子:
4.8
通讯作者:
W. Schlegel
W. Schlegel
中科院分区:
生物学2区
文献类型:
--
作者:
S. Ryser;S. Tórtola;G. van Haasteren;M. Muda;Senlin Li;W. Schlegel

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许多真核生物、原核生物和病毒基因的转录延伸受到严格控制,这有助于基因调控。在这里,我们描述这种现象的MAP激酶磷酸酶1(MKP-1)立即早期基因。在大鼠GH4 C1垂体细胞中,促甲状腺激素释放激素(TRH)和表皮生长因子EGF通过转录激活该基因快速瞬时诱导MKP-1 mRNA。Ca ~(2+)信号是诱导MKP-1应答TRH而不是EGF所必需的。报告基因分析与新克隆的大鼠启动子序列显示,只有有限的诱导反应的各种刺激,包括TRH或EGF。通过核运行的分析,我们表明,在基础条件下,一个强大的块在第一个外显子的延长调节MKP-1基因和刺激TRH或EGF克服了块。Ca 2+信号对于以类似于c-fosoncogene的方式释放MKP-1延伸阻滞是重要的。这些结果表明,在哺乳动物细胞中,MKP-1和c-fos之间可能存在一种共同的基因内调控机制。
Transcriptional elongation of many eukaryotic, prokaryotic, and viral genes is tightly controlled, which contributes to gene regulation. Here we describe this phenomenon for the MAP kinase phosphatase 1 (MKP-1) immediate early gene. In rat GH4C1 pituitary cells, MKP-1 mRNA is rapidly and transiently induced by the thyrotropin-releasing hormone (TRH) and the epidermal growth factor EGF via transcriptional activation of the gene. Ca2+signals are necessary for the induction of MKP-1 in response to TRH but not to EGF. Reporter gene analysis with the newly cloned rat promoter sequence shows only limited induction in response to various stimuli, including TRH or EGF. By nuclear run-on assays we demonstrate that in basal conditions, a strong block to elongation in the first exon regulates the MKP-1 gene and that stimulation with either TRH or EGF overcomes the block. Ca2+ signals are important to release the MKP-1 elongation block in a manner similar to the c-fosoncogene. These results suggest that a common mechanism of intragenic regulation may be conserved between MKP-1 and c-fos in mammalian cells.
DOI: --
发表时间: 1992
期刊: Oncogene
影响因子: 8
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期刊: SCIENCE
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期刊: Oncogene
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DOI: --
发表时间: 1996
期刊: Laboratory investigation; a journal of technical methods and pathology
影响因子: --
作者:
Leav,I;Galluzzi,CM;Ziar,J;Stork,PJ;Ho,SM;Loda,M
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