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- W2071736734 abstract "The aims of this study were to (i) elucidate the biosynthetic pathways for the formation of plasmenylcholine in the mammalian heart and (ii) investigate whether the control of choline glycerophospholipid production is different in hearts with high plasmenylcholine content. Guinea pig hearts were used throughout this study, since 34% of the cardiac choline glycerophospholipids in this species is present in the plasmenylcholine form. By perfusion of the guinea pig heart in the Langendorff mode with labeled choline, we demonstrated that the majority of plasmenylcholine in the heart was synthesized via the CDP-choline pathway. The ability of the heart to form plasmenylcholine from CDP-choline and 1-alkenyl-2-acylglycerol was also shown. We postulate that 1-alkenyl-2-acylglycerol in the guinea pig heart might originate from the hydrolysis of plasmenylethanolamine. In mammalian liver and other tissues, the CDP-choline pathway is the major pathway for phosphatidylcholine biosynthesis and the rate-limiting step is catalyzed by CTP:phosphocholine cytidylyltransferase. The results obtained from the present study support this supposition. In addition, evidence was obtained indicating that phosphorylation of choline by choline kinase in the CDP-choline pathway may also be rate limiting. Although the involvement of choline kinase as a rate-limiting enzyme in the CDP-choline pathway has been shown in a number of cell cultures, the rate-limiting role of this enzyme in intact mammalian organs has not been previously reported. The rationale for the presence of more than one rate-limiting step in the CDP-choline pathway in the guinea pig heart remains undefined." @default.
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- W2071736734 date "1987-10-01" @default.
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- W2071736734 title "Choline glycerophospholipid biosynthesis in the guinea pig heart" @default.
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- W2071736734 doi "https://doi.org/10.1139/o87-112" @default.
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