通过Wnt3a介导的酸丁酸4,5-双酸盐的形成调节了LRP6的酸化
Weijun Pan1, Sun-Cheol Choi, He Wang
1Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06510, USA.
概括
酸-4-酸5-激酶I型 (PIP5KI) 对于Wnt信号传输至关重要. Wnt3a激活了PIP5KI,它产生了脂 4,5-二酸盐[PtdIns (4,5) P2]来调节低密度脂蛋白受体相关蛋白6 (LRP6) 的酸化.
科学领域:
- 细胞信号传递途径 细胞信号传递途径
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在细胞过程中,Wnt-β-catenin通路是基本的.
- 激活需要酸化Wnt受体,低密度脂蛋白受体相关蛋白6 (LRP6).
- 特定的酸化位点 (Thr1479和Ser1490) 对于路径启动至关重要.
研究的目的:
- 为了确定参与Wnt诱导的LRP6酸化的激酶.
- 阐明Wnt信号调节LRP6酸化的机制.
- 确认已识别的激酶在Wnt信号传递中的作用.
主要方法:
- 人类激酶小干扰RNA库的查.
- 在哺乳动物细胞中对Thr1479和Ser1490的LRP6酸化的评估.
- 在Xenopus胚胎中进行功能研究,以确认酶的重要性.
主要成果:
- 鉴定出酸4-酶II型α和酸-4-酸5-酶I型 (PIP5KI) 对于Wnt3a诱导的LRP6酸化在Ser1490.0中至关重要.
- 在 Wnt3a 信号传递中,通过和的形式刺激了酸丁酸 4,5-二酸盐 [PtdIns (4,5) P2] 的产生.
- Dishevelled 直接与 PIP5KI 相互作用并激活它,导致 PtdIns (4,5) P2 的形成.
- PtdIns (4,5) P2 调节了LRP6在Thr1479和Ser1490.0的酸化.
结论:
- 已经揭示了Wnt介导的LRP6酸化的新信号机制.
- PIP5KI及其产物PtdIns (4,5) P2是Wnt信号启动的关键调节器.
- 这一途径为治疗Wnt相关疾病的治疗干预提供了新的目标.
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