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The relationships between delayed apoptosis, polyploid 'giant' cells and reproductive survivors were studied in p53-mutated lymphoma cells after DNA damage. Following severe genotoxic insult with irradiation or chemotherapy, cells arrest at the G(2)-M cell cycle check-point for up to 5 days before undergoing a few rounds of aberrant mitoses. The cells then(More)
In male Wistar rats of the BD I strain, mononuclear macrophages and multinucleate giant cells obtained from the peritoneum 1 day to 5 weeks after implantation of coverslips coated with dermoid cyst sebum, were examined by light microscopy and immunofluorescence microscopy, using antibodies specific for actin and tubulin and also by scanning and transmission(More)
The subcellular reaction pattern of the peroxisome compartment in rat liver cells has been studied after thyroid hormone administration for 1, 3, 5, 8, and 15 days (20 micrograms of 3, 3', 5'-triiodothyronine (T3) per 100 gm. of body weight per day). Mild hyperthyroidism caused by T3 resulted in the enlargement of the peroxisome volume fraction. This was(More)
Male rats treated with either clofibrate or nafenopin, two peroxisome proliferating compounds with potent hypolipidemic properties, show identical structural changes in their lungs. In both cases, two types of lung cells were affected by these agents: (i) the alveolar epithelial cells type II and (ii) the intraalveolar macrophages. These lung cells are(More)
The hypolipidemic drug clofibrate, which causes a striking proliferation of hepatic peroxisomes, and the induction of peroxisomal lipid metabolizing enzymes, was tested for its influence on rat lung. Alveolar cells type II of the lung are the major source of the surface-active phospholipid-apoprotein complex. Their surfactant-containing lamellar bodies are(More)
The influence of clofibrate (ethyl-alpha-p-chlorophenoxy-isobutyrate), a hypolipidemic peroxisome proliferating agent, has been tested on the lungs of adult male rats. Drug administration for 7 days caused structural changes in two types of lung cells, both of which are involved in the metabolism of the pulmonary surfactant. By light microscopy the(More)
Polyploid giant cells are produced as part of the response of p53 mutant Burkitt's lymphoma cell lines to high doses of irradiation. Polyploid giant cells arise by endo-reduplication in the first week after a single 10 Gray dose of irradiation. Within the giant cells a sub-nuclear structure is apparent and within this, sub-nuclear autonomy is evident, as(More)
Recent studies predict that tumor aneuploidy plays a direct role in tumor instability. The relationship between interphase cytogenetics, histology, grade, and tumor site was analyzed in 20 primary gastric carcinomas. Using fluorescence in-situ hybridization, the numerical changes of centromeric sequences of chromosomes 1, 3, 10, and 17 were directly(More)
The diagnostic intracytoplasmic perinuclear inclusion bodies within the fibroblastic tumor cells of recurring digital fibrous tumor of childhood (Reye tumor) were found to be ultrastructurally composed of condensed microfilaments that were continuous with axially oriented cytoplasmic filament bundles running toward the cell membrane. Immunofluorescence(More)