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肾康宁片中黄芪甲苷的薄层扫描法测定 总被引:6,自引:0,他引:6
目的:建立肾康宁片中黄芪甲甙含量测定方法。方法:双波长薄层扫描法,经水饱和正丁醇液冷浸超声提取,再上D101大树脂纯化,以氯仿-甲醇-水(65:30:10)下层液为展开剂,检测波长为520nm,参比波长为700nm。结果:平均加样回收率为97.8%(RSD=1.4%,n=6),标准曲线r=0.9996。结论:方法结果可靠、操作简单,可作为肾康宁片的质量控制标准。 相似文献
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Koppe MJ Postema EJ Aarts F Oyen WJ Bleichrodt RP Boerman OC 《Cancer metastasis reviews》2005,24(4):539-567
Summary Radioimmunotherapy (RIT) using radiolabeled monoclonal antibodies (MAbs) directed against tumor-associated antigens has evolved
from an appealing concept to one of the standard treatment options for patients with non-Hodgkin's lymphoma (NHL). Inefficient
localization of radiolabeled MAbs to nonhematological cancers due to various tumor-related factors, however, has refrained
RIT from outgrowing the experimental stage in solid tumors. Still, small volume or minimal residual disease has been recognized
as a potentially suitable target for radiolabeled antibodies. Several strategies are being explored aimed at improving the
targeting of radiolabeled MAbs to solid tumors thus improving their therapeutic efficacy. In this review, a historical overview
of the application of RIT is given and various aspects of the application of radiolabeled MAbs as anti-cancer agents are discussed.
Finally, the clinical results of RIT of NHL, colorectal cancer, ovarian cancer, breast cancer, and renal cell cancer are reviewed. 相似文献
107.
Receptor activation and 2 distinct COOH-terminal motifs control G-CSF receptor distribution and internalization kinetics 总被引:2,自引:2,他引:0
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We have studied the intracellular distribution and internalization kinetics of the granulocyte colony-stimulating factor receptor (G-CSF-R) in living cells using fusion constructs of wild-type or mutant G-CSF-R and enhanced green fluorescent protein (EGFP). Under steady-state conditions the G-CSF-R localized predominantly to the Golgi apparatus, late endosomes, and lysosomes, with only low expression on the plasma membrane, resulting from spontaneous internalization. Internalization of the G-CSF-R was significantly accelerated by addition of G-CSF. This ligand-induced switch from slow to rapid internalization required the presence of G-CSF-R residue Trp650, previously shown to be essential for its signaling ability. Both spontaneous and ligand-induced internalization depended on 2 distinct amino acid stretches in the G-CSF-R COOH-terminus: 749-755, containing a dileucine internalization motif, and 756-769. Mutation of Ser749 at position -4 of the dileucine motif to Ala significantly reduced the rate of ligand-induced internalization. In contrast, mutation of Ser749 did not affect spontaneous G-CSF-R internalization, suggesting the involvement of a serine-threonine kinase specifically in ligand-accelerated internalization of the G-CSF-R. COOH-terminal truncation mutants of G-CSF-R, found in severe congenital neutropenia, lack the internalization motifs and were completely defective in both spontaneous and ligand-induced internalization. As a result, these mutants showed constitutively high cell-surface expression. 相似文献
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Dekker M Brouwers C Aarts M van der Torre J de Vries S van de Vrugt H te Riele H 《Gene therapy》2006,13(8):686-694
We have previously demonstrated that site-specific insertion, deletion or substitution of one or two nucleotides in mouse embryonic stem cells (ES cells) by single-stranded deoxyribo-oligonucleotides is several hundred-fold suppressed by DNA mismatch repair (MMR) activity. Here, we have investigated whether compound mismatches and larger insertions escape detection by the MMR machinery and can be effectively introduced in MMR-proficient cells. We identified several compound mismatches that escaped detection by the MMR machinery to some extent, but could not define general rules predicting the efficacy of complex base-pair substitutions. In contrast, we found that four-nucleotide insertions were largely subject to suppression by the MSH2/MSH3 branch of MMR and could be effectively introduced in Msh3-deficient cells. As these cells have no overt mutator phenotype and Msh3-deficient mice do not develop cancer, Msh3-deficient ES cells can be used for oligonucleotide-mediated gene disruption. As an example, we present disruption of the Fanconi anemia gene Fancf. 相似文献