Osmotic Equilibrium and Elastic Properties of Eel Intestinal Vesicles

Osmotic Equilibrium and Elastic Properties of Eel Intestinal Vesicles Changes in volume of intestinal brush border membrane vesicles of the European eel Anguilla anguilla were measured as vesicles were exposed to media with different osmotic pressures. Preparing the vesicles in media of low osmotic pressure allowed the effects of a small hydrostatic pressure to become a significant factor in the osmotic equilibration. By applying LaPlace's law to relate pressure and volume and assuming a linear relation between membrane tension and area expansion, we estimate an initial membrane tension at 4.02 × 10−5 N cm−1 and an area compressibility elastic modulus at 0.87 × 10−3 N cm−1. The elastic modulus estimate falls in the low range of values reported for membranes from other tissues in other species. This lower modulus quantitatively accounts for why eel intestinal vesicles show measurable changes in volume in hypotonic media while rabbit kidney vesicles do not. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Osmotic Equilibrium and Elastic Properties of Eel Intestinal Vesicles

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Publisher
Springer-Verlag
Copyright
Copyright © Inc. by 1999 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s002329900568
Publisher site
See Article on Publisher Site

Abstract

Changes in volume of intestinal brush border membrane vesicles of the European eel Anguilla anguilla were measured as vesicles were exposed to media with different osmotic pressures. Preparing the vesicles in media of low osmotic pressure allowed the effects of a small hydrostatic pressure to become a significant factor in the osmotic equilibration. By applying LaPlace's law to relate pressure and volume and assuming a linear relation between membrane tension and area expansion, we estimate an initial membrane tension at 4.02 × 10−5 N cm−1 and an area compressibility elastic modulus at 0.87 × 10−3 N cm−1. The elastic modulus estimate falls in the low range of values reported for membranes from other tissues in other species. This lower modulus quantitatively accounts for why eel intestinal vesicles show measurable changes in volume in hypotonic media while rabbit kidney vesicles do not.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Sep 15, 1999

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