The last few milliseconds in the life of a secretory granule
The last few milliseconds in the life of a secretory granule
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分泌颗粒生命的最后几毫秒
DOI:
--
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发表时间:
1998
期刊:
影响因子:
--
通讯作者:
R. Chow
中科院分区:
文献类型:
--
作者:
Martin Oheim;D. Loerke;W. Stühmer;R. Chow
Abstract We have monitored single vesicles (granules) in bovine adrenal chromaffin cells using an optical sectioning technique, total internal reflection fluorescence microscopy (TIRFM). With TIR, fluorescence excitation is limited to an optical slice near a glass/water interface. In cells located at the interface, granules loaded with fluorescent dye can be visualized near to or docked at the plasma membrane. Here we give evidence that (1) TIRFM resolves single vesicles and (2) the fluorescence signal originates from vesicles of roughly 350 nm diameter, presumably large dense core vesicles (LDCVs). (3) Diffusional spread of released vesicle contents can be resolved and serves as a convenient criterion for a fusion event. (4) We give details on vesicle properties in resting cells, such as lateral mobility of chromaffin granules, number density, and frequency of spontaneous fusion or withdrawal into the cytoplasm. (5) Upon stimulation with high extracellular potassium, TIRFM reports depletion of the `visible pool' of vesicles closest to the plasma membrane within hundreds of milliseconds, consistent with previous concepts of a release-ready pool. We conclude that TIRFM constitutes an independent assay for pool depletion. TIRFM will allow us to study aspects of secretion that have previously been inaccessible in living cells, in particular the spatial relations and dynamics of vesicles prior to and during exocytosis and re-supply of the near-membrane pool of vesicles.
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DOI:
10.1016/s0021-9258(17)37001-1
发表时间:
1994-04
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
E. Etter;Michael A. Kuhn;Fredric S. Fay
通讯作者:
E. Etter;Michael A. Kuhn;Fredric S. Fay
影响因子:
56.9
作者:
LLINAS, R;SUGIMORI, M;SILVER, RB
通讯作者:
SILVER, RB
DOI:
10.1073/pnas.88.23.10754
发表时间:
1991-12-01
影响因子:
11.1
作者:
WIGHTMAN, RM;JANKOWSKI, JA;VIVEROS, OH
通讯作者:
VIVEROS, OH
影响因子:
4
作者:
I. Robinson;Mitsuhiko Yamada;M. Carrión-Vázquez;V. Lennon;Julio M. Fernandez
通讯作者:
I. Robinson;Mitsuhiko Yamada;M. Carrión-Vázquez;V. Lennon;Julio M. Fernandez
影响因子:
56.9
作者:
DENK, W;STRICKLER, JH;WEBB, WW
通讯作者:
WEBB, WW