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低氧诱导的TIMAP在内皮细胞中的上调和TIMAP依赖的瘤血管生成
Salah Aburahess1, Laiji Li1, Aashiq Hussain1
1Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
American journal of physiology. Cell physiology
|September 30, 2024
概括
抑制TGFβ的膜相关蛋白 (TIMAP) 促进血管生长. 缺氧和生长因子会增加TIMAP,而BMP9会降低TIMAP,影响瘤生长. 在小鼠中,TIMAP缺乏会减少瘤血管生成和生长.
科学领域:
- 内皮细胞生物学 内皮细胞生物学
- 血管生成的分子机制
- 癌症研究 癌症研究
背景情况:
- TGFβ抑制膜相关蛋白 (TIMAP) 是蛋白酸酶1β的调控子单元,主要表达在内皮细胞中,促进其增殖和发芽.
- 控制内皮细胞中TIMAP表达的精确分子通路尚不完全理解.
- 蒂马普在瘤血管生成和生长中的作用需要进一步调查.
研究的目的:
- 调查TIMAP表达通过骨形态遗传因子9 (BMP9),缺氧和血管生长因子在内皮细胞中的调节.
- 用小鼠乳腺癌模型确定TIMAP在瘤血管生成和体内生长中的作用.
主要方法:
- 在接受BMP9,缺氧或血管生长因子 (VEGFA,IGF-I) 治疗后评估TIMAP mRNA和蛋白质水平.
- 研究了SMAD1/5/8信号通路在TIMAP调节中的参与.
- 利用小鼠E0771乳腺癌模型来评估TIMAP缺乏对瘤生长和血管生成的影响.
主要成果:
- 通过激活SMAD1/5/8通路,BMP9显著降低了TIMAP表达.
- 低氧和Roxadustat通过抑制SMAD1/5/8通路增加了TIMAP表达.
- 通过SMAD1/5/8依赖和独立的机制,VEGFA和IGF-I提高了TIMAP水平.
- 瘤衍生因素增加了内皮TIMAP表达,这种效应被VEGF和IGF-1抑制剂抑制.
- 与野生型 littermates 相比,TIMAP缺乏的小鼠表现出明显减弱的瘤生长和血管生成.
结论:
- 在体内瘤血管生成中,TIMAP起着关键的益血管性作用.
- 低氧驱动的SMAD1/5/8通路的抑制和瘤细胞分泌的血管性因素有助于TIMAP诱导.
- 蒂马普是瘤生长和血管生成的关键媒介,突出了其作为治疗点的潜力.
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