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Página 1 a partir de 53 resultados
Changes in folate concentration in Yoshida sarcoma after administration of leucovorin or cisplatin.
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Both leucovorin (LV) and cisplatin (cis-dichlorodiammine platinum II, CDDP) act as modulators of 5-fluorouracil (5-FUra) by increasing the intracellular concentration of reduced folate. We measured intracellular folate levels following the administration of LV or cisplatin in tumor-bearing rats to
Regulation of folate reductase synthesis in sensitive and methotrexate-resistant sarcoma 180 cells. In vitro translation and characterization of folate reductase mRNA.
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A highly specific assay for folate reductase mRNA activity from Sarcoma 180 cells was developed using the rabbit reticulocyte lysate protein synthesizing system. Quantitation of in vitro folate reductase synthesis was accomplished by direct immunoprecipitation from lysate reactions. The in vitro
Comparison of folate reductases of sarcoma 180 cells, sensitive and resistant to amethopterin.
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Similar differential for total polyglutamylation and cytotoxicity among various folate analogues in human and murine tumor cells in vitro.
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Four folate analogues, methotrexate, aminopterin, 10-deazaminopterin, and 10-ethyl-10-deazaaminopterin were assessed for their ability to be metabolized to poly-gamma-glutamyl derivatives in three tumor lines which vary in their sensitivity to these agents. Cytotoxicity of the four analogues against
Pemetrexed inhibits Kaposi's sarcoma-associated herpesvirus replication through blocking dTMP synthesis
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Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiologic agent of Kaposi's sarcoma, primary effusion lymphoma, and multicentric Castleman's disease. In immunocompromised patients, KSHV infection is capable of causing severe and fatal diseases. Current antiviral treatments for KSHV infections
Retargeting of viral vectors to the folate receptor endocytic pathway.
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Viral vectors with high transfection efficiencies are not always those with optimal target cell binding specificities. As a consequence, virus pseudotyping has been developed to endow transfection competent viruses with improved cell binding specificities and affinities. We have hypothesized that
Polymorphisms and methylation of the reduced folate carrier in osteosarcoma.
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High-dose methotrexate is a standard component in the treatment of osteogenic sarcoma. Impaired methotrexate uptake associated with decreased reduced folate carrier expression is a common mechanism of methotrexate resistance in osteogenic sarcoma samples. We investigated whether promoter methylation
[Pharmacokinetics and changes of reduced folate levels in tumor after administration of cisplatin].
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Cisplatin acts as a biochemical modulator of 5-FU to increase the intracellular concentration of reduced folates. To determine the optimum schedule for administering cisplatin as a 5-FU modulator, we analyzed pharmacokinetics of platinum and changes of reduced folate levels in the tumor following
In vitro and in vivo targeting of different folate receptor-positive cancer cell lines with a novel 99mTc-radiofolate tracer.
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OBJECTIVE
For the assessment of folate-based radiopharmaceuticals, human nasopharyngeal KB carcinoma cells are traditionally used although nasopharyngeal cancer is rare. On the other hand, the folate receptor (FR) is frequently overexpressed on diverse cancer types, the highest frequency (>90%)
Trophoblast and ovarian cancer antigen LK26. Sensitivity and specificity in immunopathology and molecular identification as a folate-binding protein.
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The LK26 antigen is a cell surface glycoprotein (M(r)35,000 to 40,000) of normal placenta and gestational choriocarcinomas that shows highly restricted distribution in normal tissues, being expressed primarily in a subset of simple epithelia. In this study, immunohistochemical methods were used to
Assessment of folate receptor-α and epidermal growth factor receptor expression in pemetrexed-treated non-small-cell lung cancer patients.
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BACKGROUND
Folate receptor-α regulates cellular uptake of folates and antifolates (eg, pemetrexed) and is frequently expressed in pulmonary adenocarcinoma. EGFR is an established therapeutic target in NSCLC. Therapies targeting FRA or EGFR are available. The association between FRA and EGFR
mRNA instability in the nucleus due to a novel open reading frame element is a major determinant of the narrow tissue specificity of folate receptor alpha.
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The folate receptor type alpha (FR-alpha) is a promising tumor marker and target. Here, we investigate the mechanistic basis for the tumor specificity and vast overexpression of FR-alpha. Among representative FR-alpha-positive (HeLa and JAR) and FR-alpha-negative (MG63, Caki1, and HT3) cell lines,
Evaluation of the lipid-soluble diaminopyrimidines, metoprine and etoprine, in the avian sarcoma virus rat glioma model.
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Using the avian sarcoma virus (ASV) rat glioma model, we have evaluated the in vivo effectiveness of two lipid-soluble folate antagonists, metoprine (DDMP) and its 6-ethyl analog etoprine. When adult Fischer 344 rats, which were previously inoculated with ASV as newborns, received DDMP ip, high
Dihydrofolate reductase from Kaposi's sarcoma-associated herpesvirus.
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Kaposi's sarcoma-associated herpesvirus (KSHV) is the first human virus known to encode dihydrofolate reductase (DHFR), an enzyme required for nucleotide and methionine biosynthesis. We have studied the purified KSHV-DHFR enzyme in vitro and analyzed its expression in cultured B-cell lines derived
Sarcomas and pharmacogenetics.
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Sarcomas are a heterogeneous group of tumors, requiring different chemotherapeutic approaches. Recently, several regimens for metastatic tumors were evaluated with respect to the different responses to conventional chemotherapy of the various histologic subtypes of sarcomas. The impact of
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