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Strona 1 od 34 wyniki
Effects of BCL-2 overexpression on the sensitivity of MCF-7 breast cancer cells to ricin, diphtheria and Pseudomonas toxin and immunotoxins.
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Immunotoxins are presently being evaluated as novel agents for cancer therapy. The direct mechanism by which immunotoxins kill cancer cells is inhibition of protein synthesis, but cytotoxicity due to induction of apoptosis has also been observed with these agents. Some cancers that express high
Synergistic interaction between anti-p185HER-2 ricin A chain immunotoxins and radionuclide conjugates for inhibiting growth of ovarian and breast cancer cells that overexpress HER-2.
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Radionuclide conjugates or ricin A chain (RTA) immunotoxins that target pl85HER-2 have partially inhibited the growth of human ovarian cancer xenografts in athymic mice but generally have not cured mice bearing human tumor transplants. The present study was undertaken to explore whether a
Effect of interstitial chemotherapy with ricin temperature-responsive gel for anti-breast cancer and immune regulation in rats.
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OBJECTIVE
To explore the effect of ricin temperature response gel on breast cancer and its regulatory effect on immune function in rats.
METHODS
Ricin was purified by chromatography and identified by immunoblotting. The rat subcutaneously transplanted breast cancer model was established. Forty model
Enhancement of the activity of immunotoxins made with either ricin A chain or Pseudomonas exotoxin in human ovarian and epidermoid carcinoma cell lines.
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The present study evaluates whether the in vitro activity of immunotoxins can be enhanced by verapamil or by various antagonists of calmodulin (dansylcadaverine, trifluoperazine, chlorpromazine). The following immunotoxins made with either Pseudomonas exotoxin (PE), recombinant ricin A chain (rRTA),
Evaluation of monoclonal antibody DF3 conjugated with ricin as a specific immunotoxin for in vitro purging of human bone marrow.
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DF3 is an IgG1 monoclonal antibody (MAb) generated against a Mr 350,000-400,000 glycoprotein expressed by approximately 80% of human breast cancers. We have coupled MAb DF3 to ricin. Purification of the immunotoxin (DF3-IT) was obtained by affinity and size exclusion chromatography. DF3
Evaluation of monoclonal antibodies for the development of breast cancer immunotoxins.
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Eighty-five antibodies recognizing breast cancer-selective antigens were conjugated to ricin toxin A-chain using a disulfide linkage. The cytotoxicities of the resulting immunotoxins were determined on breast cancer cells and normal human fibroblasts. Twenty-four antibodies formed immunotoxins that
Recombinant ricin A chain conjugated to monoclonal antibodies: improved tumor cell inhibition in the presence of lysosomotropic compounds.
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Recombinant ricin A chain was chemically linked to monoclonal antibodies directed toward human breast cancer cells, a human T-cell differentiation antigen, and mouse transferrin receptor. Three types of immunotoxins were prepared; in two of them the antibody was linked to recombinant ricin A chain
Distribution and physical properties of BCA200, a Mr 200,000 glycoprotein selectively associated with human breast cancer.
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Of 122 mouse monoclonal antibodies selective for human breast cancer, 13 immunoprecipitated an acidic glycoprotein from SK-Br-3 and ZR-75-30 human breast cancer cells. The antigen (BCA200) migrates with an apparent molecular weight of 200,000 on reducing and 180,000 on nonreducing sodium dodecyl
Antibody-Pseudomonas exotoxin A conjugates cytotoxic to human breast cancer cells in vitro.
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Breast tumor selective antibodies (MAB) conjugated to Pseudomonas exotoxin A (PE) formed immunotoxins with potent cytotoxicities for human breast tumor cell lines. The most effective of the MAB-PE conjugates were about 500-fold more toxic to the breast tumor target cell lines than to the nontarget
The effect of antibodies and immunotoxins reactive with HER-2/neu on growth of ovarian and breast cancer cell lines.
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OBJECTIVE
Because HER-2/neu is overexpressed in one third of breast and ovarian cancers, we examined the effect of unconjugated monoclonal antibodies (ID-5, PB-3, TA-1) and an immunotoxin (TA-1-ricin) reactive with this protooncogene on the growth of breast and ovarian cancer cell lines.
METHODS
The
Carbon nanotubes as a protein toxin transporter for selective HER2-positive breast cancer cell destruction.
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The recombined ricin A chain protein (RTA) was transported into living cells by multiwalled carbon nanotubes (MWNTs) as a cellular carrier, as performed by natural ricin B chain protein (RTB). The conjugate of the toxin protein RTA and MWNT was found to translocate to the cytoplasm of various cell
Endocytosis and intracellular routing of an antibody-ricin A chain conjugate.
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An immunotoxin (IT) was prepared from monoclonal antibody (MoAb) 115D8 and ricin A chain. MoAb 115D8 is directed against the carcinoma-associated sialomucin MAM-6. In a protein synthesis inhibition assay this IT was cytotoxic for the human breast cancer cell line T47D. Using postembedding
Phase I evaluation of an anti-breast carcinoma monoclonal antibody 260F9-recombinant ricin A chain immunoconjugate.
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Four women with metastatic breast cancer were treated with monoclonal antibody 260F9-recombinant ricin A chain, a ricin A chain immunoconjugate (IC) which targets a Mr 55,000 antigen expressed by human mammary carcinomas. Patients were treated by daily, 1-h i.v. injections for 6 to 8 consecutive
Response of primary human mammary tumor cell cultures to a monoclonal antibody-recombinant ricin A chain immunotoxin.
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Malignant epithelial tumor cells were isolated and cultured from ten human mammary specimens of cancerous origin. The 260F9 monoclonal antibody (MAB) bound to frozen sections of all of the human breast tumors tested and to primary cultured cells from the tumors. Cultured cells from all ten breast
Cell surface density of p185(c-erbB-2) determines susceptibility to anti-p185(c-erbB-2)-ricin A chain (RTA) immunotoxin therapy alone and in combination with anti-p170(EGFR)-RTA in ovarian cancer cells.
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Approximately 30% of ovarian and breast cancers overexpress p185(c-erbB-2) with as many as 10(6) receptors/cell. Normal cells have as few as 10(4) receptors/cell. We have examined the susceptibility of SKOv3 human ovarian cancer cells to anti-c-erbB2 antibodies and immunotoxins as a function of
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