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. 1973 Mar;132(3):381–394. doi: 10.1042/bj1320381

Regulation by cytidine nucleotides of the acylation of sn-[14C]glycerol 3-phosphate. Regional and subcellular distribution of the enzymes responsible for phosphatidic acid synthesis de novo in the central nervous system of the rat

F Possmayer 1, B Meiners 1, J B Mudd 1
PMCID: PMC1177601  PMID: 4146795

Abstract

1. The regional and subcellular distribution of the incorporation of sn-[14C]glycerol 3-phosphate into rat brain lipids in vitro was investigated and compared with the relative specific activity of various chemical and enzyme markers. The similarity between the subcellular distribution of this incorporation and of NADPH-cytochrome c reductase activity indicated that the synthesis of phosphatidic acid via this route correlated with the presence of endoplasmic reticulum. 2. Experiments in which various amounts of the microsomal fraction were added to fixed amounts of nuclear, myelin, nerve-ending and mitochondrial preparations clearly demonstrated that the endoplasmic-reticulum contamination of these fractions was entirely responsible for the incorporation of sn-[14C]glycerol 3-phosphate. 3. The presence of CMP or CTP inhibited the incorporation of sn-[14C]glycerol 3-phosphate into the whole homogenate. Similar effects were observed with individual fractions, except for the mitochondria. With the mitochondrial fraction the effect of these cytidine nucleotides varied with the preparation, stimulating in some preparations and inhibiting with other preparations. The presence of CDP-choline stimulated the incorporation into the whole homogenate and to a lesser extent into the subcellular fractions. 4. These results indicate that the various organelles of the central nervous system are more dependent on endoplasmic reticulum for the production of glycerolipids de novo than has previously been appreciated.

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Selected References

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