pituitary 细胞受限的 T 盒子因子 Tpit 激活 POMC 转录与 Pitx 均质蛋白合作
B Lamolet1, A M Pulichino, T Lamonerie
1Laboratoire de Génétique Moléculaire, Institut de Recherches Cliniques de Montréal, 110 des Pins Ouest, Montreal QC, Canada H2W 1R7.
Cell
|April 6, 2001
概括
一个新的基因,Tpit,驱动垂体细胞分化和亲opiomelanocortin (POMC) 基因转录. TPIT基因的突变导致ACTH缺乏,证实TPIT在垂体POMC谱系发展中的关键作用.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 发育生物学 发展生物学
背景情况:
- 垂体腺通过激素产生来调节关键的生理功能.
- 了解控制垂体细胞分化和基因转录的分子因素至关重要.
研究的目的:
- 识别参与 pituitary 细胞分化的新型转录因子.
- 阐明Tpit在调节亲opiomelanocortin (POMC) 基因表达和脑垂体谱系发育中的作用.
主要方法:
- 对Tpit转录因子的识别和表征.
- 对Tpit与Pitx1在调节POMC基因转录中的相互作用进行分析.
- 功能获取实验,以评估TPIT在细胞分化中的作用.
- 在患有ACTH缺乏症的患者中对TPIT基因突变的基因分析.
主要成果:
- 一个T-box转录因子Tpit,在垂体POMC表达细胞系 (皮质营养菌和黑色营养菌) 中特别表达.
- Tpit与Pitx1合作,通过与相邻的调节部位结合来激活POMC基因转录.
- Tpit可以诱导POMC表达并启动未分化的垂体细胞的分化.
- TPIT基因突变与来自 pituitary POMC 的 ACTH 的孤立缺乏有关.
结论:
- Tpit是分化垂体POMC谱系的一个关键决定因素.
- Tpit在调节POMC基因转录和垂体发育方面发挥着至关重要的作用.
- Tpit功能对于正常的ACTH生产和垂体内分泌功能至关重要.
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