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Pàgina 1 des de 24 resultats
Effects of platinum-thymine on mitosis of sarcoma-180 ascites cells in vitro: ultrastructural study.
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Electron microscopic studies of sarcoma-180 ascites cells, which were treated with platinum-thymine at a concentration of 60 micrograms/ml, showed mitotic inhibition. The drug clumped the chromosomes into a compact mass at the center of the cell preventing them from separating during mitosis.
Production of thymine base damage in ultrasound-exposed EMT6 mouse mammary sarcoma cells.
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Mouse mammary sarcoma cells, line EMT6/Ro, were exposed for 1 min to 1 MHz continuous wave ultrasound over a range of intensities from 0.5 to 30 W/cm2 (spatial peak). The presence of thymine base damage (TBD) products of the 5,6-dihydroxydihydrothymine type was determined by an alkali degradation
Cell volume alterations induced by platinum-thymine in sarcoma-180 ascites cells: ultrastructural study.
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Ultrastructural studies of the effects of the chemotherapeutic agent platinum-thymine, on the morphology of sarcoma-180 ascites cells were studied to elucidate the cancer cells immediate response to therapy and the possible mode of cancer cell regression. Sarcoma-180 ascites cells treated with
Cytotoxicity of platinum (II) dinuclear complexes with 1-alkylthymine ligands against mouse sarcoma 180 cells.
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We synthesized five platinum (II) dinuclear complexes containing 1-alkylated thymines. Two of the 1-alkylated thymine, 1-MeThy and 1-EtThy, complexes afforded good crystals. The X-ray structures of these complexes were determined. The 1-MeThy complexes has a head-to-head (H-H) arrangement, while the
Could spindle cell lung carcinoma be considered and treated as sarcoma, according to its clinical course, morphology, immunophenotype and genetic finding?
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The actual nature of spindle cell carcinoma has been debated extensively because of its rarity. It carries a poor prognosis, even when early-stage disease is diagnosed and resected. In view of the rarity and the significance of the histological diagnosis, we report a patient with rapidly progressing
Predominant p53 G-->A transition mutation and enhanced cell proliferation in uterine sarcomas of CBA mice treated with 1,2-dimethylhydrazine.
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Mouse uterine tumors were examined for genetic alterations in the ras proto-oncogene and p53 tumor suppressor gene and for other biologically relevant immunohistochemical markers that may increase our understanding of the events that occur in uterine cancer. Fourteen dimethylhydrazine (DMH)-induced
ERCC5/XPG, ERCC1, and BRCA1 gene status and clinical benefit of trabectedin in patients with soft tissue sarcoma.
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BACKGROUND
The objective of this study was to determine whether specific single nucleotide polymorphisms (SNPs) from nucleotide excision repair (NER) and homologous recombination (HR) DNA repair pathways are associated with sensitivity to trabectedin in patients with soft tissue sarcoma
Analysis of germline and tumor mutations of p53 gene in familial occurrence of soft tissue sarcomas.
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BACKGROUND
Familial soft tissue sarcomas are extremely rare. There is little information available on the clinical features and molecular findings of the hereditary occurrence of mesenchymal tumor.
METHODS
A woman and her younger brother had malignant fibrous histiocytoma (pleomorphic type) and
Single Nucleotide Polymorphism Analysis in HIV and Kaposi's Sarcoma Disease by Microarray Technique
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Background: Emergence of Kaposi's Sarcoma in the cases other than HIV, following the use of immunosuppressant drugs, demonstrates that it is related to weak immunity. The fact that this malignancy does not occur in every HIV-positive
Formation of ribothymidine from thymine and ribonucleosides by the cell-free extract of tumors and rat tissues.
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Formation of ribothymidine by the ribose exchange reaction between thymine and uridine with the cell-free extract of mouse Ehrlich ascites tumor cells was demonstrated. Since phosphate ions appear to be not required for this reaction, perhaps it proceeds by the mechnism of direct exchange of
Effect of coadministration of thymine or thymidine on the antitumor activity of 1-(2-tetrahydrofuryl)-5-fluorouracil and 5-fluorouracil.
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The antitumor activity of 1-(2-tetrahydrofuryl)-5-fluorouracil (FT-207) on sarcoma was enhanced by oral coadministration of uracil, thymine, or thymidine. The activity was enhanced equally by thymine and by uracil than by thymidine, but thymine caused loss in body weight. The antitumor activity of
Effect of bleomycin on DNA, RNA, protein, chromatin and on cell transformation by oncogenic RNA viruses.
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Bleomycin (BLM) exclusively affects thymidine-containing compounds such as DNA and polydeoxyribonucleotides by releasing free thymine and leaving aldehyde functions. Molecular morphology and base sequence of the DNA strongly influence BLM activity. High BLM concentrations, besides modifying DNA into
Two germ-line mutations affecting the same nucleotide at codon 257 of p53 gene, a rare site for mutations.
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Codon 257 of the p53 gene is an extremely rare target for somatic mutations (accounting for only two of 1600 published mutations). We report here two constitutional mutations both affecting the second nucleotide of codon 257. A thymine to adenine transversion resulting in an amino acid change from
Post-operative stereotactic Curie-therapy using the iridium-192 GammaMed contact irradiation apparatus combined with radio-sensitizers in treating multiform glioblastomas.
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Experimental investigations on the dimethyl-amino-stilbous carcino-sarcoma of the rat have led to a modified interstitial post-operative Curie-therapy of gliomas in the brain hemispheres following treatment with radio sensitizers. After treatment with the thymine-analogous radio-sensitizers
[2',5'-Bis-O-(tert-butyldimethylsilyl)]-3'-spiro-5''-(4''-amino-1'',2''-oxathiole-2'',2''-dioxide) (TSAO) derivatives of purine and pyrimidinenucleosides as potent and selective inhibitors of human immunodeficiency virus type 1.
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The [2',5'-bis-O-(tert-butyldimethylsilyl)]-3'-spiro-5''-(4''-amino- 1'',2''-oxathiole-2'',2''-dioxide) (TSAO) derivatives of ribofuranosylthymine, uridine, 5-bromouridine, 5-methylcytidine, inosine, and adenosine are potent and selective inhibitors of human immunodeficiency virus type 1 (HIV-1) but
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