脂肪脂蛋白脂酶的分泌和转移利用中性基胺酶2产生的外体细胞
Terri A Pietka1, Edward F Morris1, Megan Basco1
1Department of Medicine, Division of Nutritional Sciences and Obesity Research, Washington University School of Medicine, St Louis, MO, USA.
bioRxiv : the preprint server for biology
|August 6, 2025
概括
脂肪细胞通过细胞外囊泡 (sEV) 分泌脂蛋白脂酶 (LPL),这是由nSMase2调节的过程. 这些携带LPL的sEVs促进转移到内皮细胞,这对甘油三代谢至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 代谢研究研究 代谢研究
- 细胞外囊泡生物学 细胞外囊泡生物学
背景情况:
- 脂蛋白脂酶 (LPL) 对于甘油三清除和脂肪酸供应至关重要.
- 皮细胞必须从脂肪细胞传输到毛细体内皮细胞才能发挥作用.
- 脂肪细胞LPL分泌和内皮细胞转移的精确机制仍然不完全理解.
研究的目的:
- 研究小细胞外囊泡 (sEVs) 在脂肪细胞LPL分泌和流通中的作用.
- 阐明参与通过sEVs通过LPL分泌的分子途径.
- 为了确定与sEV结合的LPL是否可以转移到内皮细胞.
主要方法:
- 脂肪细胞衍生的SEVs的蛋白质组分析.
- 人类前脂肪细胞的生成表达标记为LPL.
- sEV隔离和LPL拉下测试. 这两项测试都在进行中.
- 抑制中性基酶2 (nSMase2) 途径.
- 纳米粒子流动细胞计.纳米粒子流动细胞计.
- 与表达GPIHBP1.1的内皮细胞进行共同培养实验.
主要成果:
- 脂肪细胞衍生的sEVs在LPL中富含,超过70%的分泌LPL在sEV中发现.
- 通过sEVs分泌的LPL依赖于nSMase2通路,由GW4869治疗显著降低.
- 与sEV相关的LPL保留了脂解活性,位于sEV表面.
- 具有LPL阳性的sEV有效地将LPL转移到表达GPIHBP1的内皮细胞,但不能转移到对照细胞.
结论:
- 脂肪细胞LPL分泌和流动是由nSMase2通路介导的sEV形成控制的.
- sEVs保护LPL活动,并通过GPIHBP1.1促进其通过内皮细胞转移到内皮细胞.
- 这种机制突出了LPL输送的新途径,影响了甘油三代谢和潜在的高甘油三血症.
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