伴侣介导的自功能受损导致异常的SORT1 (sortilin 1) 周转率和CES1-依赖的甘油三化物水解
You-Jin Choi1,2, Yoon Ah Nam2, Ji Ye Hyun2
1College of Pharmacy, Daegu Catholic University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea.
Autophagy
|November 29, 2024
概括
索尔提林1 (SORT1) 被伴侣介导的自 (CMA) 降解,这一过程对调节肝脏脂质新陈代谢和碳素化酶1 (CES1) 水平至关重要. 破坏这种途径会影响甘油三的水解,并促进脂肪肝疾病.
科学领域:
- 细胞生物学 细胞生物学
- 代谢疾病 代谢疾病
- 自学研究 自学研究
背景情况:
- 索尔提林1 (SORT1) 在肝脂代谢中起着关键作用,影响非常低密度脂蛋白 (VLDL) 分泌和碳素化酶1 (CES1) 溶解体降解.
- 伴奏介导自 (CMA) 是一种选择性蛋白质降解途径,对于细胞平衡至关重要.
- CES1对于肝脏中的甘油三 (TG) 分解至关重要.
研究的目的:
- 调查SORT1是否是一个被指向通过伴侣介导自 (CMA) 降解的基质.
- 阐明SORT1-CMA相互作用在肝脂代谢和CES1调节中的作用.
- 为了检查受损的CMA介导的SORT1降解对肝脏健康和脂质积累的影响.
主要方法:
- 使用siRNA使LAMP2A (溶酶体关联膜蛋白2A) 和HSPA8/Hsc70 (热冲击蛋白家族A成员8) 沉默.
- 用白素治疗的细胞以评估SORT1.1的溶酶体积累.
- 在SORT1中进行了KFERQ类基因的突变发生,以评估HSPA8结合.
- 检查了肝细胞中的SORT1和CES1水平,以及饮食诱导脂肪肝的小鼠模型.
主要成果:
- 沉默LAMP2A或HSPA8增加了细胞质SORT1水平,而白素治疗导致了溶酶体SORT1积累,证实了CMA依赖的降解.
- 人类SORT1含有五个KFERQ类型的基因,对于HSPA8识别至关重要;突变破坏了这种结合.
- 降低CMA活性导致SORT1介导的CES1降解增加,肝细胞中的脂质积累增加,以及小鼠中饮食诱导的脂肪肝恶化.
结论:
- SORT1被确定为伴侣介导自的基质 (CMA).
- 通过CMA介导的SORT1降解对于调节CES1水平和肝脂质稳定至关重要.
- 这种途径的干扰显著影响甘油三的水解,并有助于脂肪肝疾病的发病.
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