Cellular Function of Calcium-Independent Phospholipase A2

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  • Akiba Satoshi
    Department of Pathological Biochemistry, Kyoto Pharmaceutical University
  • Sato Takashi
    Department of Pathological Biochemistry, Kyoto Pharmaceutical University

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  • Cellular function of calcium-independent phospholipase A<sub>2</sub>

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Abstract

The catalytic activity of calcium-independent phospholipase A2 (iPLA2), which is classified as a group VI PLA2, is regulated by protein kinase C, calmodulin, and others such as reactive oxygen species. Numerous findings have shown that iPLA2 is involved in stimulus-induced arachidonic acid release and lysophospholipid generation, although the participation is dependent upon the cell type and stimulus. The catalytic action of iPLA2 is known to be responsible for phospholipid remodeling as a housekeeping function. However, it has been widely accepted that arachidonic acid and lysophospholipid generated by iPLA2 act as a signaling molecule in cellular functions. Those include eicosanoid production, glucose-induced insulin secretion, Fas-induced apoptosis, cellular proliferation, membrane traffic in fusion, contribution to myocardial ischemia, and others. In this review, the functional role of iPLA2 in cellular responses upon stimulation is the focus.

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