Abstract
The effect of phospholipase C treatment on cardiolipin biosynthesis was investigated in intact H9c2 cardiac myoblasts. Treatment of cells with phosphatidylcholine-specific Clostridium welchii phospholipase C reduced the pool size of phosphatidylcholine compared with controls whereas the pool size of cardiolipin and phosphatidylglycerol were unaffected. Pulse labeling experiments with [ 1,3-3H]glycerol and pulse-chase labeling experiments with [ 1,3-3H]glycerol were performed in cells incubated or pre-incubated in the absence or presence of phospholipase C. In all experiments, radioactivity incorporated into cardiolipin and phosphatidylglycerol were reduced in phospholipase C-treated cells with time compared with controls indicating attenuated de novo biosynthesis of these phospholipids. Addition of 1,2-dioctanoyl-sn-glycerol, a cell permeable 1,2-diacyl-sn-glycerol analog, to cells mimicked the inhibitory effect of phospholipase C on cardiolipin and phosphatidylglycerol biosynthesis from [1,3-3H]glycerol indicating the involvement of 1,2-diacyl-sn-glycerol. The mechanism for the reduction in cardiolipin and phosphatidylglycerol biosynthesis in phospholipase C-treated cells appeared to be a decrease in the activities of phosphatidic acid:cytidine-5′triphosphate cytidylyltransferase and phosphatidylglycerolphosphate synthase, mediated by elevated 1,2-diacyl-sn-glycerol levels. Upon removal of phospholipase C from the incubation medium, phosphatidylcholine biosynthesis from [methyl-3H]choline was markedly stimulated. These data suggest that de novo phosphatidylglycerol and cardiolipin biosynthesis may be regulated by 1,2-diacyl-sn-glycerol and support the notion that phosphatidylglycerol and cardiolipin biosynthesis may be coordinated with phosphatidylcholine biosynthesis in H9c2 cardiac myoblast cells. (Mol Cell Biochem 188:217–223, 1998)
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Xu, F.Y., Kelly, S.L., Taylor, W.A., Hatch, G.M. (1998). On the mechanism of the phospholipase C-mediated attenuation of cardiolipin biosynthesis in H9c2 cardiac myoblast cells. In: Pierce, G.N., Izumi, T., Rupp, H., Grynberg, A. (eds) Molecular and Cellular Effects of Nutrition on Disease Processes. Developments in Molecular and Cellular Biochemistry, vol 26. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5763-0_23
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DOI: https://doi.org/10.1007/978-1-4615-5763-0_23
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