在巨细胞中,TM4SF19介导的溶酶体活性控制有助于肥胖引起的炎症和代谢功能障碍
Cheoljun Choi1, Yujin L Jeong2, Koung-Min Park3
1College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea.
Nature communications
|March 30, 2024
概括
在脂质相关巨细胞 (LAMs) 中准跨膜4L6家族成员19 (TM4SF19) 促进了应激脂肪细胞的清除. 这改善了代谢健康,并通过增强脂肪细胞增多和胰岛素敏感性来对抗肥胖.
科学领域:
- 免疫学 免疫学 免疫学
- 代谢性疾病研究研究.
- 细胞生物学 细胞生物学
背景情况:
- 脂肪组织 (AT) 免疫细胞在过度营养期间管理脂肪细胞的压力.
- 脂质相关巨细胞 (LAMs) 在肥胖和脂质诱导的炎症中至关重要.
- 功能障碍的脂肪细胞需要清除并被新的脂肪细胞取代.
研究的目的:
- 调查LAM中跨膜4L6家族成员19 (TM4SF19) 的作用.
- 为了确定TM4SF19失活对脂肪细胞清除和AT重塑的影响.
- 评估高脂肪饮食的小鼠中TM4SF19删除的代谢后果.
主要方法:
- 在LAM中分析TM4SF19表达的分析.
- 在TM4SF19淘汰赛小鼠的体外和体内研究.
- 评估脂肪细胞死亡和清除机制.
- 评估AT巨细胞群和脂肪细胞大小/数量.
- 测量全身胰岛素敏感性和能量消耗.
主要成果:
- LAMs可以选择性地表达TM4SF19,一种抑制酸化的溶酶体蛋白.
- TM4SF19的失活增强了溶酶体的酸化和脂肪细胞的清除.
- TM4SF19的删除减少了LAM的积累,并促进了AT中的修复性巨细胞.
- 缺乏TM4SF19的小鼠在高脂肪饮食下表现出脂肪细胞增生,而不是增大.
- 代谢改善包括增强胰岛素敏感性和能量消耗.
结论:
- TM4SF19是LAMs中 lysosomal功能的关键调节者.
- 无活化TM4SF19促进了适应性AT重塑,并改善了代谢健康.
- 针对TM4SF19提供了一种潜在的策略,用于打击与肥胖相关的代谢功能障碍.
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