首页> 外文期刊>Islets >Regulation of beta-cell-specific and glucose-dependent MafA expression.
【24h】

Regulation of beta-cell-specific and glucose-dependent MafA expression.

机译:调节β细胞特异性和葡萄糖依赖性MafA表达。

获取原文
获取原文并翻译 | 示例
           

摘要

MafA, a basic-leucine zipper transcription factor that is important to pancreatic beta-cell function, is regulated by several intricate mechanisms. MafA undergoes extensive posttranslational modification by phosphorylation, ubiquitination and sumoylation, and these modifications regulate the turnover, DNA binding and transactivation function of the protein. Regulation of MafA expression is equally complex. The initial characterization of the beta-cell-specific MafA promoter identified six conserved sequence domains. One of these regions in particular contains consensus motifs and binding sites for several beta-cell-enriched transcription factors which ultimately play critical roles in controlling the expression of the gene. Interestingly, in cell culture, acute high glucose stimulation induces the accumulation of MafA, and MafA, in turn, regulates beta-cell function. However, under chronic high glucose conditions, which occurs in the context of the diabetic state, beta-cell function and, coincidentally, MafA levels decline. Currently, the mechanisms controlling the glucose-dependent accumulation of MafA are not well understood. This commentary highlights a recent report that further defines the regulation of beta-cell-specific MafA expression and confirms the longstanding assumption that MafA transcription is upregulated in beta-cells acutely cultured in high glucose similar to what may occur in vivo under normoglycemic conditions.
机译:MafA是一种基本的亮氨酸拉链转录因子,对胰腺β细胞功能很重要,它受多种复杂机制的调控。 MafA通过磷酸化,泛素化和磺酰化进行了广泛的翻译后修饰,这些修饰调节蛋白质的更新,DNA结合和反式激活功能。 MafA表达的调节同样复杂。 β细胞特异性MafA启动子的初始特征鉴定了六个保守序列域。这些区域之一特别包含共有的基序和几个富含β细胞的转录因子的结合位点,这些转录因子最终在控制基因的表达中起关键作用。有趣的是,在细胞培养中,急性的高葡萄糖刺激会诱导MafA的积累,进而MafA会调节β细胞功能。但是,在糖尿病状态下发生的慢性高血糖条件下,β细胞功能以及相应的MafA水平下降。目前,控制MafA的葡萄糖依赖性积累的机制尚不清楚。该评论着重强调了最近的一份报告,该报告进一步定义了对β细胞特异性MafA表达的调节,并确认了长期以来的假设,即在高血糖急性培养的β细胞中,MafA转录上调,类似于在正常血糖条件下体内可能发生的情况。

著录项

  • 来源
    《Islets》 |2011年第1期|共3页
  • 作者

    Vanderford NL;

  • 作者单位
  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 内科学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号