Nucleolar changes and fibrillarin redistribution following Apatone treatment of human bladder carcinoma cells

James M. Jamison, Jacques Gilloteaux, Laszlo Perlaky, Marc Thiry, Karel Smetana, Deborah Neal, Karen McGuire, Jack L Summers

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Résumé

Ascorbate and menadione (Apatone) in a ratio of 100:1 kills tumor cells by autoschizis. In this study, vitamin-induced changes in nucleolar structure were evaluated as markers of autoschizis. Human bladder carcinoma (T24) cells were overlain with vitamins or with culture medium. Supernatants were removed at 1-hr intervals from 1 to 4 hr, and the cells were washed with PBS and prepared for assay. Apatone produced marked alterations in nucleolar structure including redistribution of nucleolar components, formation of ring-shaped nucleoli, condensation and increase of the proportion of perinucleolar chromatin, and the enlargement of nucleolar fibrillar centers. Immunogold labeling of the nucleolar rRNA revealed a granular localization in treated and sham-treated cells, and immunogold labeling of the rDNA revealed a shift from the fibrillar centers to the condensed perinucleolar chromatin. Fibrillarin staining shifted from the fibrillar centers and adjacent regions to a more homogeneous staining of the entire nucleolus and was consistent with the percentage of autoschizic cells detected by flow cytometry. Because autoschizis entails sequential reactivation of DNase I and DNase II, and because the fibrillarin redistribution following DNase I and Apatone treatment is identical, it appears that the nucleolar and fibrillarin changes are markers of autoschizis.

langue originaleAnglais
Pages (de - à)635-651
Nombre de pages17
journalJournal of Histochemistry and Cytochemistry
Volume58
Numéro de publication7
Les DOIs
Etat de la publicationPublié - juil. 2010
Modification externeOui

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