The synthesis of sphingomyelin in the Morris hepatomas 7777 and 5123D is restricted to the plasma membrane. 1985

A van den Hill, and G P van Heusden, and K W Wirtz

The site of sphingomyelin synthesis in the rapidly growing Morris hepatomas 7777 and 5123D was determined by incubating plasma membrane, mitochondrial and microsomal membrane fractions with vesicles of phosphatidyl[methyl-14C]choline in the presence of phosphatidylcholine transfer protein. In agreement with a previous study on rat liver (Voelker, D.R. and Kennedy, E.P., 1982, Biochemistry 21, 2753-2759) we have demonstrated that sphingomyelin synthesis in these hepatomas is restricted to the plasma membrane. The greatly elevated sphingomyelin content of mitochondria and microsomes (Hostetler, K.Y., Zenner, B.D. and Morris, H.P., 1979, Cancer Res. 39, 2978-2983) suggests that rapidly growing hepatomas, in contrast to liver, have an effective mechanism of intracellular sphingomyelin transfer.

UI MeSH Term Description Entries
D008114 Liver Neoplasms, Experimental Experimentally induced tumors of the LIVER. Hepatoma, Experimental,Hepatoma, Morris,Hepatoma, Novikoff,Experimental Hepatoma,Experimental Hepatomas,Experimental Liver Neoplasms,Hepatomas, Experimental,Neoplasms, Experimental Liver,Experimental Liver Neoplasm,Liver Neoplasm, Experimental,Morris Hepatoma,Novikoff Hepatoma
D008297 Male Males
D008862 Microsomes, Liver Closed vesicles of fragmented endoplasmic reticulum created when liver cells or tissue are disrupted by homogenization. They may be smooth or rough. Liver Microsomes,Liver Microsome,Microsome, Liver
D008930 Mitochondria, Liver Mitochondria in hepatocytes. As in all mitochondria, there are an outer membrane and an inner membrane, together creating two separate mitochondrial compartments: the internal matrix space and a much narrower intermembrane space. In the liver mitochondrion, an estimated 67% of the total mitochondrial proteins is located in the matrix. (From Alberts et al., Molecular Biology of the Cell, 2d ed, p343-4) Liver Mitochondria,Liver Mitochondrion,Mitochondrion, Liver
D011915 Rats, Inbred BUF An inbred strain of rat that is used for cancer research, particularly the study of CARCINOGENESIS Rats, Inbred Buffalo,Rats, BUF,BUF Rat,BUF Rat, Inbred,BUF Rats,BUF Rats, Inbred,Buffalo Rats, Inbred,Inbred BUF Rat,Inbred BUF Rats,Inbred Buffalo Rats,Rat, BUF,Rat, Inbred BUF
D002352 Carrier Proteins Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes. Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D002462 Cell Membrane The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells. Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D000727 Androgen-Binding Protein Carrier proteins produced in the Sertoli cells of the testis, secreted into the seminiferous tubules, and transported via the efferent ducts to the epididymis. They participate in the transport of androgens. Androgen-binding protein has the same amino acid sequence as SEX HORMONE-BINDING GLOBULIN. They differ by their sites of synthesis and post-translational oligosaccharide modifications. Androgen Binding Protein,Binding Protein, Androgen,Protein, Androgen Binding,Protein, Androgen-Binding
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013109 Sphingomyelins A class of sphingolipids found largely in the brain and other nervous tissue. They contain phosphocholine or phosphoethanolamine as their polar head group so therefore are the only sphingolipids classified as PHOSPHOLIPIDS. Sphingomyelin

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