The purification of plasma membranes from WI-38 fibroblasts. Effects of ageing on their composition

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Abstract

A three-step method for the purification of plasma membranes from WI-38 fibroblasts was developed thus allowing the recovery of 36-44% of the plasma membrane. Except in the case of galactosyltransferase, the activity of the contaminating enzymes was very low. Morphological observations confirm the presence of a homogeneous population of vesicles. Preparations obtained from young and old cell cultures were compared for their enzymatic and protein contents. With ageing the activity of 5'-nucleotidase significantly increases whereas that of alkaline phosphodiesterase I decreases. Out of the 26 components detected after sodium dodecyl sulphate polyacrylamide gel electrophoresis, four decreased but only one increased. Cellular ageing seems to fulfil a specific and localized effect on the plasma membrane.
Original languageEnglish
Pages (from-to)313-324
Number of pages12
JournalBiochimica et Biophysica Acta
Volume642
Issue number2
Publication statusPublished - 1 Jan 1981

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