Exogenously added alkylmethylglycerophosphocholine and alkylmethylcarbamylglycerophosphocholine accumulate in plasma membranes more than in intracellular membranes of rabbit platelets.

Abstract:

:We found that extracellular addition of 2% bovine serum albumin (BSA) to a suspension of rabbit platelets after stimulation with platelet-activating factor resulted in a biphasic extraction of [3H]1-O-alkyl-2-O-methyl (or 2-O-methylcarbamyl)-sn-glycero-3-phosphocholine. A fast phase of extraction of the phospholipid probe by BSA was found to be mainly due to removal of the probe remaining in an outer layer of platelet plasma membrane, whereas a second phase of extraction of the probe by BSA was mostly attributed to redistribution of the probe which had been flipped across the plasma membrane. On the basis of analysis of the biphasic extraction by BSA of 1-O-alkyl-2-O-methyl (or methylcarbamyl)-sn-glycero-3-phosphocholine at various times after its addition, we suggested that the radioactive phospholipid accumulated in plasma membrane more than in intracellular membranes of rabbit platelets. In similar experiments with guinea-pig polymorphonuclear leukocytes, we observed a monophasic extraction of 1-O-alkyl-2-O-methyl (or methylcarbamyl)-sn-glycero-3-phosphocholine by BSA, indicating its unidirectional movement across the plasma membrane.

journal_name

Chem Phys Lipids

authors

Tokumura A,Tsutsumi T,Nishioka Y,Tsukatani H

doi

10.1016/s0009-3084(97)02664-9

subject

Has Abstract

pub_date

1997-03-28 00:00:00

pages

75-83

issue

1

eissn

0009-3084

issn

1873-2941

pii

S0009308497026649

journal_volume

86

pub_type

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