需要通过脂解生成的配体激活PPARγ,才能在人体热生成脂肪细胞中诱导cAMP依赖的UCP1
bioRxiv : the preprint server for biology
|August 30, 2024
概括
罗西格利塔 (Rsg) 和福斯科林 (Fsk) 在人体脂肪细胞中急性诱导解蛋白1 (UCP1). 最大的UCP1诱导需要ATGL介导的脂解,从而产生天然的PPARγ激动剂.
科学领域:
- 代谢研究的研究.
- 脂肪细胞生物学 脂肪细胞生物学
- 分子内分泌学分子内分泌学
背景情况:
- 解蛋白1 (UCP1) 是棕色/色脂肪细胞热生成的关键.
- 诱导UCP1与cAMP信号和PPARγ激活有关.
- 人体脂肪细胞中PPARγ激动剂对UCP1上调的确切机制尚不清楚.
研究的目的:
- 调查罗西格利塔 (Rsg) 是否在先前存在的人类脂肪细胞中调节UCP1或诱导新的色脂肪细胞分化.
- 阐明在UCP1诱导中cAMP信号和PPARγ激活之间的相互作用.
- 确定ATGL介导的脂解在UCP1表达中的作用.
主要方法:
- 从原始细胞分化的人类脂肪细胞被用Rsg,福斯科林 (Fsk) 或两者一起治疗.
- 这些技术包括批量RNASeq,RNAScope,RT-PCR,CRISPR-Cas9对PNPLA2 (ATGL) 的淘汰,氧气消耗和西部涂抹.
- 细胞反应在3,6和78小时后被评估.
主要成果:
- 无论是Rsg还是Fsk都迅速诱导了UCP1mRNA,独立于新的脂肪细胞分化.
- 观察到不同的转录形状,但这两种治疗都促进了beiging特征.
- 由于ATGL淘汰,FSK诱导的UCP1表达显著减少,这表明需要脂解产品.
- 罗西格利塔逆转了ATGL淘汰对Fsk诱导的UCP1的抑制作用,这表明脂解产生了内源的PPARγ激动剂.
结论:
- 在人类脂肪细胞中,UCP1转录由PPARγ激活和cAMP信号传递都会急性诱导.
- cAMP信号协同增强了PPARγ激活的UCP1表达.
- 通过ATGL介导的脂解产生天然的PPARγ配体,这对于最大的cAMP刺激的UCP1诱导至关重要.
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