孕激素通过PR-B介导的脂质生成增加肝脂含量和血脂水平
Kang Ju Jeong1, Moeka Mukae1, Sang R Lee1
1College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Republic of Korea.
Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie
|February 16, 2024
概括
孕激素 (P4) 通过增加参与脂质生成的关键蛋白质,显著增强肝脏脂肪合成. 用RU486阻断孕激素受体抑制了这些效应,突出了P4.
科学领域:
- 内分泌学 在内分泌学.
- 代谢研究研究 代谢研究
- 生殖生物学 生殖生物学
背景情况:
- 孕激素 (P4) 是一种重要的生殖激素,通过孕激素受体 (PR) 影响类固醇生成和转录活性.
- 肝脏在P4介导的脂质代谢中的生理作用及其与胰岛素抵抗和能量平衡的联系仍未得到充分研究.
- 肝脏新生脂质生成 (DNL),对于合成碳水化合物中的甘油三和胆固醇至关重要,由乙-CoA通路调节.
研究的目的:
- 调查孕激素 (P4) 在肝脂代谢中的作用,重点关注 de novo 脂质生成 (DNL) 和相关途径.
- 确定P4影响肝脏脂肪合成和胆固醇代谢的分子机制.
- 确认P4在卵巢切除条件下和怀孕期间对体内脂质生成的影响.
主要方法:
- 利用RNA测序来分析P4对脂质基因表达,脂肪肝,脂肪酸代谢和脂蛋白信号传递的影响.
- 测量了主要脂原蛋白的肝脏水平,包括SREBP-1C,PPARγ,ACC和CD36.
- 采用孕激素受体抗剂RU486来阻断P4信号,并评估其在P4介导的脂质生成中的必要性.
主要成果:
- 孕激素 (P4) 显著增加了肝脏中的SREBP-1C,PPARγ,ACC和CD36的水平,这些都是DNL的关键调节者.
- 同时使用P4受体对抗剂RU486阻断了这些蛋白质的P4诱导的增加,并抑制了P4介导的脂质生成.
- RNA测序证实了P4在促进肝脏DNL,脂肪肝和改变脂质新陈代谢方面的作用,这些影响在卵巢切除和怀孕小鼠中得到验证.
- 通过母体暴露,P4直接在暴露的小鼠中增强了脂质发生,并间接在胎儿中增强了脂质发生.
结论:
- 孕激素 (P4) 直接刺激肝脏的新生脂质生成和脂质合成,影响肝脏脂肪的积累.
- P4通过孕激素受体 (PR) 信号来发挥其脂质效应,RU486阻断证明了这一点.
- 这些发现表明P4在孕期调节脂质代谢中起着重要作用,并可能导致与怀孕相关的代谢变化.
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