Nuclear retention of 18S ribosomal RNA by human myeloma cells |
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Authors: | Dr. John W. Bynum Elliot Volkin |
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Affiliation: | (1) Biochemistry Unit, School of Medicine, Southern Illinois University, 62901 Carbondale, Illinois, USA;(2) Biology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA |
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Abstract: | Summary Normal quiescent lymphocytes regulate their ribosome content by selectively degrading newly synthesized 18S ribosomal RNA. Unlike actively dividing HeLa cells, lymphocytes retain 18 S ribosomal RNA in the nucleus after synthesis instead of immediately transporting it to the cytoplasm. Subcellular fractionation of the highly differentiated human neoplastic lymphocyte RPMI-8226 reveals that this cell line also retains 18 S ribosomal RNA in the nucleus, a trait not displayed by the less differentiated human lymphoblastoid cell line RPMI-4265. These observations suggest that neoplastic cells can be phenotypically characterized by their ribosomal RNA processing patterns.Operated by Union Carbide Corporation with the Department of Energy |
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Keywords: | Ribosomal RNA Neoplastic lymphocytes Cytodifferentiation RNA transport |
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