Permeability of human blood platelets to glycerol.

Abstract:

:The permeability of human platelets to glycerol was determined at 37 degrees C, 25 degrees C, and 0 degrees C from the rate of change of cell volume after abrupt addition of 0.5 mol/liter glycerol in phosphate-buffered saline. Intracellular water volume was measured employing both tritiated water and a photometric method. Intracellular glycerol was measured employing tritiated glycerol. The glycerol permeability coefficient derived from the tracer cell volume data was 4.0 +/- 0.7 X 10(-7) cm/s at 37 degrees C, and 1.1 +/- 0.4 X 10(-7) cm/s at 25 degrees C, and the photometric data gave a permeability coefficient of 5.4 +/- 0.4 X 10(-7) cm/s at 37 degrees C. The activation energy between 23 degrees C and 37 degrees C for glycerol permeation was 19.8 kcal/mol. The cells were virtually impermeable to glycerol at 0 degrees C. The minimum intracellular water volume attained after the addition of 0.5 mol/liter glycerol at 37 degrees C determined by the photometric method was 47.8% of normal water volume, whereas the minimum water volume calculated assuming that glycerol exerted its full osmotic effect (i.e., sigma = 1) was 45.6%. The reflexion coefficient was therefore assumed to be unity. Neither method of cell volume determination could be used with 1 or 2 mol/liter glycerol: adequate separation of the cells from the labeled medium could not be achieved in the tracer method; in the photometric method, it was apparent that transmittance (660 nm) was influenced by one or more variables in addition to cell volume.

journal_name

J Cell Physiol

authors

Armitage WJ

doi

10.1002/jcp.1041280118

subject

Has Abstract

pub_date

1986-07-01 00:00:00

pages

121-6

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

128

pub_type

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