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- W1969386504 abstract "Astrocytes are the principal sites of glycogen synthesis in the nervous tissue. Growing evidence shows that there are many types of astrocytes. The aim of the present investigation was to isolate different types of astrocytes that display different carbohydrate anabolism. Astrocytes from newborn rat brain were directly cloned from primary cultures without a previous transformation. Many clones were obtained, and they were termed CP clones. Another series of clones, termed SV clones, were obtained after the transfection of the primary cultures by the SV40 T antigen. The effectiveness of the transfection was verified by the rate of DNA synthesis using flow cytometry and by the presence of plasmid DNA in the genomic DNA of the astrocytes using the Southern blot method. After the transfection, the growth velocity increased greatly. The size and shape of the astrocytes were the same for each cell in a given clone, regardless of the cloning method utilized. However, these sizes and shapes could be different from one clone to another in CP clones, whereas all the astrocytes of all the SV clones looked like each other. All the clones obtained stained positively with anti-glial fibrillary acidic protein antibodies. Glycogen stained in the clones using concanavalin A-horseradish peroxidase. The glycogen content was also measured using biochemical analysis. Concordant results obtained using these two methods showed that some clones contained an important quantity of glycogen while other clones contained a small amount, in the CP series as well as in the SV series. This property was the same for the intracellular glucose concentrations. The activity of the gluconeogenic enzyme fructose-1,6-bisphosphatase was measured in each clone using spectrophotometry. This activity was also significantly different from one clone to another. The clones containing large amounts of glycogen had important fructose-1,6-bisphosphatase activity. The present results show that it is possible to clone astrocytes either directly from primary cultures without immortalization or after their transformation. When analyzing these clones, it appears that carbohydrate anabolism can be significantly different from one astrocyte to another. This difference may also exist in vivo. © 1996 Wiley-Liss, Inc." @default.
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- W1969386504 date "1996-11-01" @default.
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- W1969386504 title "Isolation of carbohydrate metabolic clones from cultured astrocytes" @default.
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- W1969386504 doi "https://doi.org/10.1002/(sici)1098-1136(199611)18:3<244::aid-glia8>3.0.co;2-z" @default.
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