通过CDK6介导的内皮细胞周期加速驱动在遗传性出血性telangiectasia中的动脉静脉形
Sajeth Dinakaran1,2, Sima Qutaina1,2, Haitian Zhao1
1Litwin-Zucker Alzheimer's Research Center, The Feinstein Institutes for Medical Research, Northwell Health, Manhasset, NY, USA.
Nature cardiovascular research
|November 2, 2024
概括
遗传性出血端膜切除症 (HHT) 涉及到内皮细胞增多. 这项研究揭示了循环素依赖性激酶6 (CDK6) 驱动HHT中的细胞循环问题,这表明CDK4/6抑制剂可以治疗AVMs.
科学领域:
- 血管生物学 血管生物学
- 细胞循环规则 细胞循环规则
- 遗传学 是一个遗传学.
背景情况:
- 动脉静脉形形 (AVMs) 的特点是,在遗传性出血性远程连接症 (HHT) 中,内皮细胞的增多.
- 驱动HHT内皮细胞周期放松调节的精确分子机制仍然不完全理解.
研究的目的:
- 调查环林依赖性激酶6 (CDK6) 在内皮细胞周期进展和HHT中AVM发展中的作用.
- 评估CDK4/6抑制剂对于HTT相关的血管病理的治疗潜力.
主要方法:
- 在HHT小鼠模型和患者样本中分析内皮细胞周期进展.
- 评估化视网膜母细胞瘤蛋白 (pRB1) 作为G1/S过渡的标志物.
- 用CDK4/6抑制剂 (palbociclib, ribociclib) 对HHT小鼠的治疗以及AVMs和血管病理的评估.
- 产生内皮细胞特异性的CDK6淘汰小鼠.
主要成果:
- 在HHT小鼠中的内皮细胞表现出加速的细胞周期进展,绕过G1/S检查点.
- 在HHT视网膜AVM和皮肤telangiectasias的内皮细胞中观察到增加的prb1水平.
- 用palbociclib或ribociclib抑制CDK4/6降低了pRB1,AVMs,并在HHT小鼠中改善了血管病理.
- 对CDK6的内皮细胞特异性除在HHT小鼠中提供了防止AVM发展的保护.
结论:
- CDK6在细胞周期放松调节和在HHT中观察到的AVM病变发生过程中发挥着关键作用.
- 临床批准的CDK4/6抑制剂显示出治疗HT相关血管异常的治疗潜力.
相关概念视频
Regulation of Angiogenesis and Blood Supply
2.5K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
2.5K
Mechanism of Angiogenesis
5.3K
Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
5.3K
Inhibition of Cdk Activity
4.7K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
4.7K
DNA Damage can Stall the Cell Cycle
9.0K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.0K


