斑马鱼肠细胞中的电压感应酶 (VSP) 通过内细胞膜贩运的时空调节
Adisorn Ratanayotha1, Natsuki Mizutani2, Fumiko Takenaga2
1Laboratory of Integrative Physiology, Department of Physiology, Graduate School of Medicine, The University of Osaka, Suita, Osaka, 565-0871, Japan; Laboratory of Neuroscience, Department of Anatomy, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkoknoi, Bangkok, 10700, Thailand.
Biochimica et biophysica acta. General subjects
|February 11, 2026
概括
电压感应酸酶 (VSP) 通过控制内细胞分裂来调节斑马鱼肠细胞的营养吸收. 丢失Dr-VSP会损害营养吸收和内解体组织,揭示了膜贩运的新型电化学机制.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 身体生理学 身体生理学
背景情况:
- 在发育中的脊椎动物中,营养素的吸收依赖于内细胞分裂,这是由类化物重塑调节的过程.
- 电压感应酸酶 (VSP) 存在于斑马鱼的富含溶解体的肠细胞 (LREs),对营养吸收至关重要.
- 斑马鱼VSP (Dr-VSP) 在内细胞膜贩运中的确切作用尚未完全理解.
研究的目的:
- 阐明Dr-VSP调节斑马鱼肠细胞内细胞内膜贩运的分子机制.
- 研究Dr-VSP在营养吸收过程中的局部化和动态行为.
- 确定Dr-VSP损失对营养吸收和内分泌组织的功能影响.
主要方法:
- 对焦成像用于跟踪Dr-VSP的定位和动态.
- 在不同的pH条件下评估VSP活动的电生理学分析.
- 对Dr-VSP功能丧失突变体的表型分析,以评估对内分细胞和营养吸收的影响.
主要成果:
- 在营养吸收过程中,Dr-VSP局部化到亚皮性内膜,并重新分布到顶端的血膜.
- 博士-VSP促进早期囊泡的形成,并保持内分泌体组织.
- 丢失Dr-VSP导致早期内细胞囊泡减少,循环和 lysosomal 区间被破坏,营养吸收有缺陷.
- VSP活动取决于电压和pH值,受到酸性pH值的抑制,其功能仅限于顶端等离子膜.
结论:
- 在血膜的内细胞分裂的初始阶段,Dr-VSP作为电压和pH调节的氨酸酸酶起作用.
- 这项研究确定了VSP在脊椎动物肠细胞上皮质营养吸收中的关键作用.
- 提出了一种用于涉及VSP的脊椎动物膜贩运的新型电化学机制.
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