由HIF驱动的SF3B1诱导KHK-C来强制果分解和心脏病
Peter Mirtschink1, Jaya Krishnan1, Fiona Grimm1
1Institute of Molecular Health Sciences, ETH Zurich, 8093 Zürich, Switzerland.
Nature
|June 18, 2015
概括
过度摄入果糖会使代谢综合征恶化. 心肌缺氧通过SF3B1将果糖代谢转移到心脏,影响心脏缩和功能.
科学领域:
- 生物化学 生物化学
- 心脏病学 心脏病学
- 分子生物学分子生物学
背景情况:
- 果糖是一种关键的饮食糖,与代谢综合征有关.
- 凯托赫索基因酶 (KHK) 代谢果糖,其异型为KHK-A和KHK-C.
- 具有较高亲和力的KHK-C主要在肝脏中代谢果糖.
研究的目的:
- 研究心肌果糖代谢在病理性心脏缩中的作用.
- 在缺氧压力下确定调节心脏中果糖代谢的分子机制.
主要方法:
- 利用病理性心脏缩的人类和小鼠模型.
- 研究了心肌缺氧,HIF1α激活和SF3B1.1.的作用.
- 在小鼠中评估了SF3B1枯竭和Khk基因切除的影响.
主要成果:
- 心肌缺氧通过HIF1α和SF3B1.1.诱导心脏中的果糖代谢.
- 在低氧条件下,SF3B1调解了KHK-A到KHK-C的拼接切换.
- 特定于心脏的SF3B1枯竭或Khk剥离减轻了压力诱导的果糖代谢,心脏生长和功能障碍.
结论:
- SF3B1是病理性缩期间心脏中果糖代谢的关键调节者.
- 这一途径突出了一个新的果糖代谢调节系统,对病态心脏生长至关重要.
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