pepstatin/sarcoma

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Effect of protease inhibitors on focus formation by murine sarcoma virus.

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The effect of six protease inhibitors, isolated from various species of actinomycetes, on focus formation by murine sarcoma virus was examined. Pepstatin was the only inhibitor. The treatment of cells with pepstatin at various times possibly retards the early stage of infection with murine sarcoma

Effects of E-64 (cysteine-proteinase inhibitor) and pepstatin (aspartyl-proteinase inhibitor) on metastasis formation in mice with mammary and ovarian tumors.

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The effects of E-64 (Cathepsin B and L inhibitor) and Pepstatin A (Cathepsin D inhibitor) on spontaneous and experimental metastasis formation were investigated in mice with MCa mammary carcinoma, M5076 ovarian sarcoma and L1210 leukemia. Pepstatin induced a marked decrease in the number of

Identification of tissue sites for increased albumin degradation in sarcoma-bearing mice.

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Plasma albumin concentration declines in both experimental and clinical cancer. Previous investigations have demonstrated that this is partly explained by increased breakdown of albumin. The present study has identified the tissue sites for increased albumin degradation in a nonmetastasizing sarcoma

Some properties of cathepsins chemically fixed to carriers.

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An insoluble preparation of rat liver cathepsin D was obtained by coupling the enzyme to Enzacryl Polyacetal (EPA-cathepsin) and to CNBr-activated Sepharose 4B. EPA-cathepsin was active toward the synthetic hexapeptides (Gly-Phe-Leu)2 and did not split hemoglobin. The optimum pH of splitting was

Studies on the mechanism of action of an antibody-targetted drug-carrier conjugate.

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A conjugate of methotrexate-substituted human serum albumin (HSA) coupled to a monoclonal antibody (791T/36) recognizing osteogenic sarcoma cell lines has been reported previously to have good cytotoxicity and specificity in vitro (Garnett et al., 1983). Cytotoxicity was assessed by the median

[Cathepsins D from normal and some human neoplasms].

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Cathepsins D were isolated from human liver and spleen, from three malignant tumours (kidney cancer, sarcoma, spleen tumour caused by chronic myeloleucosis) and from one non-malignant tumour (uterine myoma). The isolation procedure involved adsorption on pepstatin-Sepharose and gel-filtration on

Antimetastatic activity of adriamycin in combinations with proteinase inhibitors in mice.

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The antimetastatic activity of adriamycin in combination with proteinase inhibitors was investigated in mice bearing the metastatic tumors L1210 leukemia, Lewis lung carcinoma or M5076 sarcoma. Leupeptin, a cathepsin B inhibitor, when administered as a single agent was devoid of antimetastatic

[Expression of proteolytic enzymes of metastatic tumor cells and the effects of some influencing factors].

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OBJECTIVE To elucidate the types of proteolytic enzymes the dendritic cell sarcoma (DCS) cell expressed in vitro and the effects of modulating factors. METHODS The proteolytic spots of DCS cells were examined, with ten different proteinase inhibitors, various antibodies and

Novel cell death pathways induced by N-(4-hydroxyphenyl)retinamide: therapeutic implications.

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We previously reported that N-(4-hydroxyphenyl)retinamide (4HPR) inhibits retinoblastoma tumor growth in a murine model in vivo and kills Y79 retinoblastoma cells in vitro. In this work, we assayed different cell death-related parameters, including mitochondrial damage and caspase activation, in Y79

Avian retroviral protease and cellular aspartic proteases are distinguished by activities on peptide substrates.

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The avian sarcoma/leukemia virus protease (PR), purified from avian myeloblastosis virus has a native molecular mass of 26 kDa, suggesting a dimer structure. The enzymatic activity of PR has been characterized using synthetic peptide substrates. PR is most active at pH 5.5, 35 degrees C and 2-3 M

Effect of brown spider venom on basement membrane structures.

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Loxoscelism or necrotic arachnidism are terms used to describe lesions and reactions induced by bites (envenomation) from spiders of the genus Loxosceles. Envenomation has been reported to provoke dermonecrosis and haemorrhage at the bite site and haemolysis, disseminated intravascular coagulation

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