脂肪细胞的特征限制了细胞对胰岛素的反应和葡萄糖的运输
Claes Fryklund1, Mathis Neuhaus1, Karin G Stenkula1
1Department of Experimental Medical Science, Lund University, Lund, Sweden.
American journal of physiology. Endocrinology and metabolism
|October 25, 2023
概括
脂肪细胞的特征,而不是大小,限制胰岛素反应. 脂肪仓库的起源影响葡萄糖的吸收,皮下脂肪在小鼠扩张时表现出减少的容量.
科学领域:
- 代谢生理学 代谢生理学
- 脂肪组织生物学 脂肪组织生物学
- 胰岛素耐药性研究研究
背景情况:
- 脂肪细胞功能障碍是系统性胰岛素抵抗的核心.
- 胰岛素反应性葡萄糖载体4 (GLUT4) 表达在胰岛素抵抗中降低.
- 细胞对胰岛素的反应因脂肪库的起源和脂肪组织扩张而有所不同.
研究的目的:
- 为了确定限制细胞胰岛素反应的因素.
- 在细胞水平上检查脂肪细胞功能和葡萄糖运输特征.
- 了解脂肪细胞葡萄糖运输能力的脂肪储存区别.
主要方法:
- 从吃或高脂肪饮食的小鼠中分离皮下 (内) 和内脏 (表皮) 脂肪细胞.
- 测量细胞大小,葡萄糖摄取量,细胞质体积和总/GLUT4蛋白质表达.
- 对每个细胞的基位和胰岛素刺激葡萄糖吸收的分析.
主要成果:
- 每个细胞的基础葡萄糖吸收在饮食和脂肪储存中是一致的.
- 每个细胞的胰岛素刺激葡萄糖吸收在膨胀的皮下脂肪细胞中减少,但在内脏脂肪细胞中保持稳定.
- GLUT4含量仅在扩张的皮下脂肪细胞中减少,而细胞溶液空间和总蛋白质随着内脏脂肪细胞的扩张而增加.
结论:
- 与脂肪储存来源相关的显著脂肪细胞表型特征限制了细胞对胰岛素的反应和葡萄糖的吸收.
- 仅仅脂肪细胞的大小并不能决定胰岛素的反应性;仓库特定的特征至关重要.
- 这些发现提供了关于限制脂肪细胞功能的因素和脂肪扩张对胰岛素反应的储存区特异性影响的见解.
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