Lysophospholipid acyltransferases (LPLATs) catalyse the addition of fatty acyl moieties to the glycerol backbone of lysophospholipids . In addition to playing a crutial role in the synthesis of structural membrane components the LPLATs are also implicated in cellular signalling responses for cytokines, growth factors and other agonists. Cellular signalling through the interleukin 1 receptor in human mesangial cells and EL-4 cells proceeds by the activation of lysophosphatidic acid acyltransferase (LPAAT). Activation of LPAAT by interleukin 1 results in the generation of unsaturated phosphatidic acid species, that are crucial to the generation of diacylglycerol and interleukin 1 signalling. LPLATs are also involved in signalling for increased interleukin 2 synthesis through the T cell antigen receptor. Activation of T-cells via anti-CD3 stimulation has been shown to increase incorporation of polyunsaturated fatty acids intophosphatidylcholine via lysophosphatidylcholine acyltransferase.Activation of this enzyme is essential for the sustained activationand translocation of protein kinase C.
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