Transcriptional control of the mouse Col7a1 gene in keratinocytes: basal and transforming growth factor-beta regulated expression.

Transcriptional control of the mouse Col7a1 gene in keratinocytes: basal and transforming growth factor-beta regulated expression.
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角质形成细胞中小鼠 Col7a1 基因的转录控制:基础和转化生长因子-β 调节表达。

DOI:
10.1111/j.1523-1747.2003.12640.x
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发表时间:
2003
期刊:
The Journal of investigative dermatology.
影响因子:
--
通讯作者:
Klement,JohnF
Klement,JohnF
中科院分区:
--
文献类型:
--
作者:
Naso,Michael;Uitto,Jouni;Klement,JohnF

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复层鳞状上皮的皮肤基底膜区的支持原纤维对于维持皮肤完整性是必不可少的,因为这些结构的缺失导致慢性起泡疾病,营养不良性大疱性表皮病。VII型胶原蛋白是锚定原纤维的主要成分,主要由基底角质形成细胞合成,其次由真皮成纤维细胞合成。为了阐明VII型胶原基因(Col 7a 1)的转录控制元件,克隆了小鼠基因的3 kb 5′侧翼序列,测序并与氯霉素乙酰转移酶报告基因融合。启动子缺失分析表明,Col 7a 1 5′侧翼序列的560 bp是培养的小鼠角质形成细胞基础水平转录所必需的。突变的DNA序列与共识的转录因子,包括Sp1/Sp3,AP 2,AP 1,和Smads的结合位点相似,在p-560 Col 7a 1启动子/氯霉素乙酰转移酶的构建,加上DNA结合试验,揭示了基础Col 7a 1表达这些网站的重要性。使用相同的Col 7a 1启动子/氯霉素乙酰转移酶构建体检测转化生长因子β(角质形成细胞和真皮成纤维细胞中Col 7a 1表达的激活剂)的作用。这些分析表明,转化生长因子β1刺激Col 7a 1转录依赖于Smads和AP 1之间的假定相互作用。有趣的是,Smad样结合位点是基础和转化生长因子β1刺激Col 7a 1转录所必需的。总的来说,这些发现证明了表皮角质形成细胞中Col 7a 1转录的复杂调节。
Anchoring fibrils at the cutaneous basement membrane zone of the stratified squamous epithelia are essential to maintaining skin integrity, as absence of these structures leads to the chronic blistering disease, dystrophic epidermolysis bullosa. Type VII collagen, the major component of anchoring fibrils, is synthesized primarily by basal keratinocytes and to a lesser degree by dermal fibroblasts. To elucidate the transcriptional control elements of the type VII collagen gene (Col7a1), 3 kb of 5′ flanking sequence of the mouse gene was cloned, sequenced, and fused to the chloramphenicol acetyltransferase reporter gene. Promoter deletion analyses revealed that 560 bp of Col7a1 5′ flanking sequence was sufficient and necessary for basal level of transcription in cultured murine keratinocytes. Mutagenesis of DNA sequences with similarity to consensus binding sites for transcription factors, including Sp1/Sp3, AP2, AP1, and Smads, within the p-560 Col7a1 promoter/chloramphenicol acetyltransferase construct, coupled with DNA binding assays, revealed the importance of these sites for basal Col7a1 expression. The effect of transforming growth factor β, an activator of Col7a1 expression in keratinocytes and dermal fibroblasts, was examined using the same Col7a1 promoter/chloramphenicol acetyltransferase constructs. These analyses demonstrated that transforming growth factor β1 stimulation of Col7a1 transcription is dependent on a putative interaction between Smads and AP1. Interestingly, the Smad-like binding site was essential for both basal and transforming growth factor β1 stimulated Col7a1 transcription. Collectively, these findings attest to the complex regulation of Col7a1 transcription in epidermal keratinocytes.
锚定原纤维含有 VII 型原胶原的羧基端球状结构域,但缺乏氨基端球状结构域。
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