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  Regulation of granule size in human and horse eosinophils by number of fusion events among unit granules

Hartmann, J., Scepek, S., & Lindau, M. (1995). Regulation of granule size in human and horse eosinophils by number of fusion events among unit granules. The Journal of Physiology - London, 483(1), 201-209. doi:10.1113/jphysiol.1995.sp020578.

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Hartmann, Jana1, Author              
Scepek, Susanne1, Author              
Lindau, Manfred1, Author              
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1Department of Molecular Cell Research, Max Planck Institute for Medical Research, Max Planck Society, ou_1497703              

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 Abstract: 1. We have investigated the granule size distributions in human and horse eosinophils by time-resolved patch-clamp capacitance measurements. 2. During exocytosis of single granules the electrical capacitance of the plasma membrane increases in discrete steps. The steps in horse cells are about six times larger than those in human cells in accordance with the difference in granule size. 3. In both species a multimodal capacitance step size distribution is observed with a first peak at 6-7 fF corresponding to granules with a diameter of about 450-500 nm and a surface area of about 0.7 microns2, which we call the unit granule. The other peaks in the distributions correspond to multiples of the surface area of these units. 4. These results show that the larger granules are formed by fusion of several unit granules and the final size of mature granules is determined by the number of units allowed to fuse with each other. Whereas in human eosinophils most granules consist of one or two units, most granules of horse eosinophils are formed by fusion of seven to fifteen units. 5. The intracellular fusion events associated with vesicular traffic are believed to occur constitutively. In contrast, our results indicate that a cellular mechanism exists which regulates the size of the mature granules by determining the number of units allowed to fuse with each other. In view of our recent report that granule-granule fusion can be activated by GTP gamma S, this regulation may possibly involve GTP-binding proteins.

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Language(s): eng - English
 Dates: 1994-06-091994-07-271995-02-15
 Publication Status: Published in print
 Pages: 9
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 Table of Contents: -
 Rev. Type: Peer
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Title: The Journal of Physiology - London
Source Genre: Journal
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Publ. Info: London : Cambridge University Press
Pages: - Volume / Issue: 483 (1) Sequence Number: - Start / End Page: 201 - 209 Identifier: ISSN: 0022-3751
CoNE: https://pure.mpg.de/cone/journals/resource/954925334693_2