血生物合成调节棕色脂肪组织中的BCAA代和热生成
bioRxiv : the preprint server for biology
|December 11, 2023
概括
血红蛋白生物合成对于棕色脂肪热生成至关重要. 它的抑制会损害能量消耗,但仅仅恢复血红素是不够的;阻断分支链氨基酸分解也是促进新陈代谢的关键.
科学领域:
- 代谢调节 代谢调节 代谢调节
- 脂肪组织生物学 脂肪组织生物学
- 线粒体功能 线粒体功能
背景情况:
- 衰老与增加的身体脂肪和减少的能量消耗有关.
- 棕色脂肪组织 (BAT) 和色脂肪组织通过UCP1.1散发热量并增加能量消耗.
- 促进热生成是对抗与年龄相关的代谢疾病的潜在策略.
研究的目的:
- 研究血红蛋白生物合成在棕色脂肪细胞功能和热生成中的作用.
- 了解血红素前体对UCP1调节和线粒体功能的影响.
- 阐明分支链氨基酸 (BCAA) 代谢与脂肪组织中的热生成之间的联系.
主要方法:
- 抑制棕色脂肪细胞中的血生物合成.
- 补充血红素及其前体.
- 测量线粒体功能和UCP1水平.
- 对BCAA代谢和propionyl-CoA积累的分析.
主要成果:
- 血红素生物合成是棕色脂肪细胞中细胞内血红素的主要来源.
- 抑制血合成会损害线粒体功能,并降低UCP1水平.
- 虽然血红素补充恢复了线粒体功能,但由于BCAA代谢过程中的propionyl-CoA积累,UCP1的下调仍然存在.
- 暴露在寒冷中增加了BAT中的BCAA吸收,突出显示了BCAA代谢对热生成的重要性.
结论:
- 血红蛋白生物合成是维持棕色脂肪组织热生成的关键代谢途径.
- 从受损的BCAA代谢中产生的Propionyl-CoA积累阻碍了UCP1功能和发热,即使血红蛋白水平恢复了.
- 血红蛋白生物合成作为BCAA的显著代谢沉,将血红蛋白代谢与脂肪组织中的BCAA代谢相结合.
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