Production of 1,2-diacylglycerol in human erythrocyte membranes exposed to low concentrations of calcium ions

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  • Department of Biochemistry


A specific increase in the membrane content of 1,2-diacylglycerol occurred when erythorcytes were lysed at 20 °C in media which did not include a chelator of Ca2+ and also when Ca2+ was added to haemoglobin-free erythrocyte ghosts which had been prepared in the presence of ethyleneglycol-bis-(β-aminoethylether)-N,N′-tetraacetic acid (EGTA). The maximum increase was about 20-fold. The production of 1,2-diacylglycerol appeared to be caused by an endogenous membrane-bound phospholipase C which was half-maximally activated at less than 1 μM Ca2+ and which had access to only about 0.6-0.8% of the cells' glycerolipids. This activity was optimal at pH 7.0-7.2 in the presence of 0.1 mM Ca2+; under these conditions diacylglycerol production was complete within 5-10 min. Enzyme activity was markedly decreased at low temperatures, and was abolished by heating at 100 °C for 1 min.


Original languageEnglish
Pages (from-to)824-830
Number of pages7
JournalBBA - Biomembranes
Issue number3
Publication statusPublished - 14 Dec 1976

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