与斯芬哥米林合成酶相关的蛋白质是血清棕基转移酶的调节剂
Xiang Li1, Zhiqiang Li2, Yeun-Po Chiang1
1Department of Cell Biology, State University of New York Downstate Health Sciences University, Brooklyn, NY, USA.
Journal of lipid research
|September 25, 2025
概括
斯芬哥米林合成酶相关蛋白 (SMSr) 调节了血清棕转移酶 (SPT) 的活性,影响了斯芬戈脂类的新陈代谢. 抑制SMSr为治疗与代谢功能障碍相关的脂肪肝疾病 (MAFLD) 提供了潜在的新策略.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 代谢疾病 代谢疾病
背景情况:
- 斯芬哥米林合成酶相关蛋白 (SMSr) 与代谢功能障碍相关的脂肪肝疾病 (MAFLD) 有关,但其机制尚不清楚.
- SMSr是一种酸丁乙醇胺特异性脂酶C,与其他SMS家族成员不同.
- 甲状腺脂代谢在细胞功能和疾病发病过程中起着至关重要的作用.
研究的目的:
- 阐明SMSr与MAFLD相关的机制.
- 调查SMSr与脂生物合成之间的关系,特别是脂蛋白棕转移酶 (SPT).
- 探索针对SMSr用于MAFLD治疗的潜力.
主要方法:
- 对人类基因型-组织表达 (GTEx) 数据进行分层聚类分析,以确定肝脏和脂肪组织中共同表达的基因.
- 在体内小鼠的研究涉及高脂肪饮食下的SMSr过度表达和淘汰赛 (KO) 模型.
- 生物化学测试以测量SPT活性和脂水平.
- 在体内共免疫沉以评估蛋白质-蛋白质相互作用.
主要成果:
- 与其他脂代谢基因一起,SMSr和SPT在肝脏和脂肪组织中表现出共同表达.
- 在人体组织中,SMSr表达与SPT子单元 (Sptlc1,Sptlc2) 有正相关.
- 在小鼠中,SMSr过度表达增加了SPT活性,而SMSr KO则减少了SPT活性.
- 发现SMSr在体内与SPTLC2相互作用,表明其具有调节作用.
- 甲基乙醇胺 (PE) 治疗调节了SPT活性和SPTLC2表达,这表明PE在SMSr介导调节中的作用.
结论:
- SMSr直接调节SPT活动,将其定位为 sfingolipid生物合成途径的关键参与者.
- 向SMSr,可能通过其脂酶C活性调节PE水平,为MAFLD提供了一种新的治疗策略.
- SMSr淘汰赛小鼠是可行的,这表明抑制SMSr活性可能是治疗MAFLD和潜在的心血管疾病的安全方法.
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