在极化上皮细胞中调节Na+,K(+) -ATPase细胞表面分布的机制
R W Hammerton1, K A Krzeminski, R W Mays
1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, CA 94305-5426.
Science (New York, N.Y.)
|November 8, 1991
概括
两极化的上皮细胞通过选择性酶保留和损失维持,,腺三酸酶 (Na+,K,K,K+) -ATPase) 的分布,而不仅仅是蛋白质向. 这影响了健康和疾病中的离子运输.
科学领域:
- 细胞生物学 细胞生物学
- 生理学 生理学 生理学
- 生物化学 生物化学
背景情况:
- 两极化的上皮细胞表现出域特异性蛋白质定位,这对于载体运输至关重要.
- ,腺三酸酶 (Na+,K(+) -ATPase) 是细胞功能必不可少的关键离子.
研究的目的:
- 研究产生Na+,K(+) -ATPase在两极化上皮细胞中受限膜分布的机制.
- 为了区分蛋白质向和蛋白质保留/无活化模型之间的Na+,K(+) -ATPase局部化.
主要方法:
- 使用麦丁-达比犬 (MDCK) 表皮细胞作为模型系统.
- 通过实验评估了Na+,K(+) -ATPase在不同膜领域的分布和活性.
- 研究了新合成的Na+,K(+) -ATPase子单元的命运.
主要成果:
- Na+,K(+) -ATPase活性优先保留在基底侧膜领域.
- 活性酶被选择性无活化,并从顶膜域中消失.
- 来自Golgi的新合成的Na+,K(+) -ATPase的矢量向并不是基本侧面局部化的主要机制.
结论:
- 在两极分化的上皮细胞中,Na+,K(+) -ATPase的有限分布源于合成后的调节 (保留和失活),而不是仅仅来自于有针对性的贩运.
- 了解这些机制对于理解表皮功能和与离子运输缺陷相关的疾病状态至关重要.
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