Oncostatin M Stimulates Transcription of the Human α2(I) Collagen Gene via the Sp1/Sp3-binding Site*

Oncostatin M Stimulates Transcription of the Human α2(I) Collagen Gene via the Sp1/Sp3-binding Site*
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制瘤素 M 通过 Sp1/Sp3 结合位点刺激人类 α2(I) 胶原蛋白基因的转录*

DOI:
--
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发表时间:
1997
影响因子:
4.8
通讯作者:
M. Trojanowska
M. Trojanowska
中科院分区:
生物学2区
文献类型:
--
作者:
H. Ihn;E. Leroy;M. Trojanowska

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抑瘤素M(Oncostatin M,OSM)是造血细胞因子家族的一员,与骨过度生长和纤维化过程有关。作为正在进行的纤维化分子机制研究的一部分,我们研究了人成纤维细胞中OSM对α2(I)胶原基因的转录调控。通过α2(I)胶原启动子中碱基对(bp)-148和-108之间的缺失分析,定位了OSM反应元件。对含有各种取代突变的α2(I)胶原启动子的进一步功能分析表明,该启动子的基础活性和OSM刺激都是由位于bp-128和-123之间的TCCTCC基序介导的。此外,三个拷贝的含有“TCC”基序的12-bp合成α2(I)胶原启动子片段赋予OSM对其他无反应的胸苷激酶启动子的诱导作用。电泳迁移率变动分析表明,TCCTCC基序构成一个新的结合位点的转录因子Sp1和Sp3。未刺激和经OSM刺激的成纤维细胞之间的体外凝胶位移结合试验中未观察到差异。然而,微妙的构象变化,检测到在该地区的启动子周围的TCC重复OSM刺激后,使用体内足迹分析。总之,本研究表征了介导人α2(I)胶原启动子的基础活性和OSM刺激的双功能反应元件。
Oncostatin M (OSM), a member of the hematopoietic cytokine family, has been implicated in excessive bone growth and in the process of fibrosis. As part of an ongoing study of the molecular mechanisms of fibrosis, we have investigated the transcriptional regulation of the α2(I) collagen gene by OSM in human fibroblasts. An OSM response element was mapped by deletional analysis between base pairs (bp) −148 and −108 in the α2(I) collagen promoter. Further functional analysis of the α2(I) collagen promoter containing various substitution mutations revealed that both the basal activity and OSM stimulation of this promoter are mediated by a TCCTCC motif located between bp −128 and −123. Furthermore, three copies of the 12-bp synthetic α2(I) collagen promoter fragment containing the “TCC” motif conferred OSM inducibility to the otherwise unresponsive thymidine kinase promoter. Electrophoretic mobility shift assays demonstrated that the TCCTCC motif constitutes a novel binding site for the transcription factors Sp1 and Sp3. No differences have been observed in in vitro gel shift binding assays between unstimulated and OSM-stimulated fibroblasts. However, subtle conformational changes were detected in the region of the promoter surrounding TCC repeats after OSM stimulation using in vivofootprint analysis. In conclusion, this study characterized a dual-function response element that mediates the basal activity and OSM stimulation of the human α2(I) collagen promoter.
DOI: 10.1172/jci116015
发表时间: 1992-10-01
影响因子: 15.9
作者:
POSTLETHWAITE, AE;HOLNESS, MA;RAGHOW, R
通讯作者: RAGHOW, R
DOI: 10.1172/jci117618
发表时间: 1994-12-01
影响因子: 15.9
作者:
REITAMO, S;REMITZ, A;UITTO, J
通讯作者: UITTO, J
重组白细胞介素 1 对培养的人类细胞中 I 型和 III 型胶原蛋白的合成以及相关原胶原 mRNA 水平的调节。
DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Krane,SM
鉴定对 pro-alpha 2(V) 胶原蛋白基因 (COL5A2) 的细胞类型特异性转录所必需的上游调控区域。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Truter,S;DiLiberto,M;Inagaki,Y;Ramirez,F
通讯作者: Ramirez,F