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Pubmed ID :11563837
Publication Date : //

Role of calcium-independent phospholipases (iPLA(2)) in phosphatidylcholine metabolism.


The proposed role of calcium-independent phospholipase A(2) (iPLA(2)) in membrane phospholipid homeostasis was tested by examining the perturbation of phosphatidylcholine metabolism by enzyme overexpression. There are alternatively spliced forms of murine iPLA(2) that were widely expressed in mouse tissues: a long form containing exon-9 that is membrane-associated and a short form lacking exon-9 that is distributed between the membrane and cytosolic fractions. Enforced expression of either iPLA(2) isoform led to a significant increase in intracellular free fatty acid, lysophosphatidylcholine, and GPC without a concomitant increase in the incorporation of either exogenous arachidonic acid or choline. The accumulation of lysophosphatidylcholine in iPLA(2)-expressing cells illustrates the limited capacity of cells for reacylation and degradation of lysophospholipids. Since iPLA(2) overexpression did not accelerate either phospholipid remodeling or phosphatidylcholine synthesis, this enzyme does play a determinant (rate-controlling?) role in either of these cellular processes.

Authors : Chiu C H , Jackowski S ,

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