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10 resultater
Decreased sensitivity of an interferon-resistant subline of murine leukemia L-1210 cells to toxic effects of ricin and abrin.
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Ribosome-inactivating protein and apoptosis: abrin causes cell death via mitochondrial pathway in Jurkat cells.
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Abrin belongs to the type II family of ribosome-inactivating proteins comprising a galactose-binding B chain coupled with a toxic A chain through a single disulphide linkage. Apart from its RNA-N-glycosidase activity, another role that has been recently ascribed to abrin was the induction of
Spectroscopic analysis of the cytoagglutinating activity of abrin-b isolated from Abrus precatorius seeds against leukemic cells.
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The cytoagglutinating activity of abrin-b, a toxic lectin isolated from Abrus precatorius seeds, against cultured cell strains derived from acute lymphoblast leukemia (ALL) was investigated by visible (VIS) spectroscopy. Upon addition of abrin-b, the turbidity at 600 nm of cell suspension decreased
Biological activities of the lectin, abrin-a, against human lymphocytes and cultured leukemic cell lines.
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The cytoagglutination by abrin-a against human cultured cell lines derived from acute lymphoblastic leukemia (ALL) and human peripheral blood lymphocytes obtained from normal adults and from patients with adult T cell leukemia (ATL) was investigated. Among acute T lymphoblastic leukemia (T-ALL) cell
Plant-derived abrin-a induces apoptosis in cultured leukemic cell lines by different mechanisms.
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Abrin-a consists of A-chain with N-glycosidase activity, which inhibits protein synthesis, and lectin-like B-chain responsible for binding with cell-surface receptors and penetrating of abrin-a molecule into the cells. As a lectin component, the B-chain can also participate in cell signal
Effect of ricin and abrin on survival of L1210 leukemic mice and on leukemic and normal bone-marrow cells.
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The effect of ricin and abrin on the survival of mice treated with L1210 leukemic cells intraperitoneally or intravenously was studied. In mice given 1 X 10(5) L1210 leukemia cells intraperitoneally a single dose of ricin (2.1 microgram/kg) intraperitoneally gave the best results, an increased life
Antitumor effects of abrin and ricin used singly and in combination with cisplatin.
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Abrin, ricin, and cisplatin produced significant increases in survival times of mice inoculated with 10(6) Ehrlich ascites carcinoma or L1210 leukemia cells 24 hours prior to treatment. Combinations of abrin or ricin with cisplatin produced markedly synergistic action in prolonging survival times of
New indirect approach to the therapeutic use of immunotoxins.
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To improve the applicability of immunotoxins (ITs), we have developed a new two-step indirect procedure. The target cells to be killed are first incubated with cell-specific mouse monoclonal antibodies (MAbs). After removal of excess unbound antibody, the cells are incubated in the presence of
Immunotoxins: is there a clinical value?
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Drug targeting is an attractive new approach to killing malignant cells, thereby leaving normal tissue unharmed. A decisive breakthrough was the advent of hybridoma technology, making monoclonal antibodies (MoAb) available in limitless supply. To construct reagents with selectivity for certain tumor
Immunotoxins: a clinical review of their use in the treatment of malignancies.
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Immunotoxins are a new class of antitumor agents consisting of tumor-selective ligands (generally monoclonal antibodies [MoAbs]) linked to highly toxic protein molecules that have been modified to remove their normal tissue-binding domains. These immuno-conjugates combine the potency of the parent
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