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Sample records for aclarubicin

  1. Postincubation with aclarubicin reverses topoisomerase II mediated DNA cleavage, strand breaks, and cytotoxicity induced by VP-16

    Petersen, L N; Jensen, P B; Sørensen, B S; Engelholm, S A; Spang-Thomsen, M

    1994-01-01

    In previous studies, we found that VP-16 (etoposide) induced cytotoxicity and protein-concealed strand break formation was prevented in a small cell lung cancer (SCLC) cell line, when the cells were incubated with aclarubicin prior to treatment with VP-16. In the present work, we studied the effe...... the antagonism to topo-II targeting drugs both when administered prior to and after the topo-II targeting agents. Thus, our data suggest that sequential rather than simultaneous administration of aclarubicin and topo-II targeting agents may be superior with respect to net...

  2. Efficacy and safety of the HAA regimen as induction chemotherapy in 236 de novo acute myeloid leukemia

    叶佩佩

    2013-01-01

    Objective To evaluate the efficacy and safety of the HAA regimen (homoharringtonine,cytarabine and aclarubicin) as induction chemotherapy in de novo acute myeloid leukemia (AML) .Methods The efficacy and safety of 236 de novo AML patients who received the HAA regimen as induction chemotherapy were retrospectively analyzed.The complete remission (CR) rate was assayed.Kaplan-Meier method was used to estimate overall survival (OS) and relapse free survival (RFS) ,and the differ-

  3. Cytoplasmic Trafficking of Minute Virus of Mice: Low-pH Requirement, Routing to Late Endosomes, and Proteasome Interaction

    Ros, Carlos; Burckhardt, Christoph J.; Kempf, Christoph

    2002-01-01

    The cytoplasmic trafficking of the prototype strain of minute virus of mice (MVMp) was investigated by analyzing and quantifying the effect of drugs that reduce or abolish specific cellular functions on the accumulation of viral macromolecules. With this strategy, it was found that a low endosomal pH is required for the infection, since bafilomycin A1 and chloroquine, two pH-interfering drugs, were similarly active against MVMp. Disruption of the endosomal network by brefeldin A interfered with MVMp infection, indicating that viral particles are routed farther than the early endocytic compartment. Pulse experiments with endosome-interfering drugs showed that the bulk of MVMp particles remained in the endosomal compartment for several hours before its release to the cytosol. Drugs that block the activity of the proteasome by different mechanisms, such as MG132, lactacystin, and epoxomicin, all strongly blocked MVMp infection. Pulse experiments with the proteasome inhibitor MG132 indicated that MVMp interacts with cellular proteasomes after endosomal escape. The chymotrypsin-like but not the trypsin-like activity of the proteasome is required for the infection, since the chymotrypsin inhibitors N-tosyl-l-phenylalanine chloromethyl ketone and aclarubicin were both effective in blocking MVMp infection. However, the trypsin inhibitor Nα-p-tosyl-l-lysine chloromethyl ketone had no effect. These results suggest that the ubiquitin-proteasome pathway plays an essential role in the MVMp life cycle, probably assisting at the stages of capsid disassembly and/or nuclear translocation. PMID:12438589

  4. Prediction of P-glycoprotein expression and chemoresistant character of gliomas by SPECT

    Iuchi, Toshihiko; Togawa, Takashi; Oga, Masaru; Osato, Katsunobu [Chiba Cancer Center (Japan); Namba, Hiroki; Fujimoto, Shuichi

    2000-09-01

    In this prospective study of 25 malignant gliomas, we correlated the {sup 99m}Tc-MIBI uptake/{sup 201}Tl uptake ratio (MIBI/Tl) with the expression of P-glycoprotein in tumor tissue and the tumor's response to anticancer agents. All patients underwent {sup 99m}Tc-MIBI and {sup 201}Tl SPECT before surgery. Semiquantitative assessment of tracer uptake was performed using the ratio of radioactivity in the tumor relative to normal scalp. Immunohistochemical studies were performed on paraffin sections using an anti-P-glycoprotein monoclonal antibody, JSB-1. Chemosensitivity of the gliomas to following 12 anticancer agents: vincristine, vinblastine, vindesine, etoposide, irinotecan, daunomycin, adriamycin, aclarubicin, epirubicin, pirarubicin, actinomycin and mitoxantrone, was determined by an in vitro assay using surgical specimens, and chemosensitivity was expressed as the number of effective drugs. Gliomas expressing P-glycoprotein were significantly less chemosensitive than gliomas without the glycoprotein (p=0.010), and MIBI/Tl of gliomas expressing P-glycoprotein was significantly smaller than tumors without expression (p=0.008). From the prognostic point of view, gliomas showing MIBI/Tl of 0.6 or less had fewer effective drugs (p=0.008). However, MIBI/Tl was not effective at predicting overall survival in patients with malignant glioma. From these results, we concluded that efflux of {sup 99m}Tc-MIBI through P-glycoprotein could be evaluated by MIBI/Tl, and this index reflected well the chemoresistant character of malignant gliomas. (author)