期刊
CELL BIOCHEMISTRY AND BIOPHYSICS
卷 33, 期 3, 页码 227-240出版社
HUMANA PRESS INC
DOI: 10.1385/CBB:33:3:227
关键词
insulin secretion; active zone; compound exocytosis; ultramicroelectrode; electrochemistry
Spatially resolved measurements of exocytosis in pancreatic beta -cells were made using amperometry with 1-mum radius electrodes. These measurements revealed that certain portions of a cell actively undergo exocytosis following stimulation with depolarizing agents, but other regions are inactive. The amperometric measurements were compared to measurements made with the mem brane indicator dye, FM1-43, which showed uneven increases in fluorescence around the surface of the cell, with amperometric secretion being detected only at the brightest regions. Ln some instances, a large number of exocytotic events were detected from one electrode position. The number of events was larger than what would be expected based on the number of vesicles that could fit under an electrode of the dimensions used. These results suggest a mechanism of vesicle traffic that allows multiple fusions at a small membrane area.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据