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• W2003042258 abstract "Within 72–96 hr after preparation, about 10% of the karyoplasts made from mouse L929 cells regenerated to reform whole viable cells. As soon as 30 hr after preparation, however, nearly all of the remaining 90% of karyoplasts were dead. By separating living and dead karyoplasts at 30 hr, therefore, that fraction destined to complete regeneration was effectively purified. Complete separation was accomplished by sedimentation through Ficoll-paque (Pharmacia), a patented preparation originally developed for the separation of monocytes from whole blood. With the addition of this technique to the previously reported purification scheme for karyoplasts, various biochemical and morphological studies were attempted. Of particular importance are results indicating that karyoplasts that regenerate do not initially contain any more cytoplasm than the average karyoplast in a preparation—that is, about 10% of the cytoplasm within a whole cell. Electron microscopy of karyoplasts immediately after preparation indicated an unequal partitioning of cytoplasmic organelles at the time of enucleation. For example, karyoplasts initially contained about 11.4% of the mitochondrial volume of whole cells, but only 2.9% of the Golgi apparatus. The size of the karyoplasts and the volume occupied by a variety of organelles was followed throughout the process of regeneration. Although there was an approximately linear increase in the diameter of regenerating karyoplasts, there appeared not to be a simple concordant increase in the volume occupied by all cellular organelles. An extensive investigation was performed to determine whether or not karyoplasts contained centrioles. Immediately after enucleation, 15,000 random thin sections through karyoplasts, which represented about 100 complete bodies, were examined for the presence or absence of centrioles. No centrioles were observed. Examination of the cytoplasts revealed that they contained a sufficient number of centrioles to account for all of the centrioles that were present in the whole cells before enucleation. Centrioles were first detected in karyoplasts at 24 hr after preparation, about the same time that karyoplasts regained the ability to adhere to the surface of tissue culture dishes. At this time, however, the average karyoplast had less than one centriole. By 72 hr, the regenerated karyoplasts had approximately the same number of centrioles as whole cells." @default.
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• W2003042258 date "1979-11-01" @default.
• W2003042258 modified "2023-09-24" @default.
• W2003042258 title "Purification and characterization of regenerating mouse L929 karyoplasts" @default.
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• W2003042258 doi "https://doi.org/10.1016/0092-8674(79)90121-1" @default.
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