Furuya Y, Yamamoto K, Kohno N, Hamaoka T, Ono H, Kuroda Y. In vitro changes of the nuclear AgNORs pattern induced by RNA inhibitors and 5-fluorouracil in human breast cancer cells, MCF-7 and HBC-4.
Cancer Lett 1998;
134:97-101. [PMID:
10381135 DOI:
10.1016/s0304-3835(98)00243-2]
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Abstract
The morphological changes of argyrophilic nucleolar organizer regions (AgNORs) were studied in two human breast cancer cell lines, MCF-7 and HBC-4. Treatment with an RNA polymerase inhibitor (actinomycin D) reduced the size of AgNORs and increased the number of AgNORs. Messenger RNA polymerase inhibitor (alpha-amanitin) also increased the number of AgNORs. However, translational blocking agents closely related to ribosomal RNA (cycloheximide and anisomycin) caused a decrease in the number of AgNORs, which seemed to fuse to an aggregate around the nucleolus and formed a single large spherical AgNOR in the final stage. These changes were observed typically when cells were treated with 5-fluorouracil or 5-fluorouridine. These morphological changes in the AgNORs pattern, AgNORs aggregation, might reflect certain damage in ribosomal RNA.
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