viscum album/protease

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Activation of caspase cascades in Korean mistletoe (Viscum album var. coloratum) lectin-II-induced apoptosis of human myeloleukemic U937 cells.

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Mistletoe lectins are of high biological activity and exert cytotoxic effects. We have previously shown that Korean mistletoe, Viscum album var. coloratum, lectin-II specifically induces apoptotic cell death in cancer cells, not normal lymphocytes. The destructive mechanism by mistletoe lectins on

Biochemical characterization of a component in extracts of Viscum album enhancing human NK cytotoxicity.

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Enhancement of human NK cytotoxicity in the presence of fresh Viscum album extract and some commercial V. album extracts Iscador correlated strictly with an increased formation of lytic effector cell/K562 tumor cell conjugates in the single-cell assay. Both activities were completely destroyed by

Mistletoe viscotoxins increase natural killer cell-mediated cytotoxicity.

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Mistletoe extracts have immunomodulatory activity. We show that nontoxic concentrations of Viscum album extracts increase natural killer (NK) cell-mediated killing of tumor cells but spare nontarget cells from NK lysis. The compounds responsible for this bioactivity were isolated from mistletoe and

Involvement of hydrogen peroxide in mistletoe lectin-II-induced apoptosis of myeloleukemic U937 cells.

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Mistletoe lectin-II, a major component of Korean mistletoe (Viscum album var. coloratum) induces apoptotic death in cancer cells. In this study, we demonstrated that lectin-II induced the generation of pro-oxidants and thus resulted in the apoptotic death of human myeloleukemic U937 cells. We

Biochemical and morphological changes in mouse liver induced by mistletoe toxins.

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Natural compounds are often characterized by high biological activity and sometimes toxicity. This also applies to compounds contained in the herb mistletoe. The objective of this study was to investigate short-term effects (up to 48 h) of mistletoe toxins on mouse hepatocytes. Standardized

Gamma-interferon (IFN-gamma) augments apoptotic response to mistletoe lectin-II via upregulation of Fas/Fas L expression and caspase activation in human myeloid U937 cells.

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Mistletoe lectin-II, a major composition of Korean mistletoe (Viscum album coloratum), is known as a potent apoptosis inducer. The previous research has demonstrated that Korean mistletoe lectin-II induces apoptosis via c-Jun N terminal kinase (JNK) activation in human myeloid U937 cells. The

Therapeutic Potential of Medicinal Plant Proteins: Present Status and Future Perspectives.

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Biologically active molecules obtained from plant sources, mostly including secondary metabolites, have been considered to be of immense value with respect to treatment of various human diseases. However, some inevitable limitations associated with these secondary metabolites like high cytotoxicity,

Mistletoe lectin activates caspase-8/FLICE independently of death receptor signaling and enhances anticancer drug-induced apoptosis.

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Mistletoe lectin I (ML-I) is a major active component in plant extracts of Viscum album that is increasingly used in adjuvant cancer therapy. ML-I exerts potent immunomodulating and cytotoxic effects, although its mechanism of action is largely unknown. We show that treatment of leukemic T- and

Viscothionin purified from mistletoe (Viscum album var. coloratum Ohwi) induces insulin secretion from pancreatic beta cells.

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Mistletoe (Viscum album), an evergreen parasitic plant, has been widely used as an oriental phytomedicine to treat diabetes mellitus. However, it is unknown which mistletoe constituent exerts the beneficial effect against the disease. In this study, we examined the hypoglycemic

Screening of fusion partners for high yield expression and purification of bioactive viscotoxins.

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Viscotoxins are small cationic proteins found in European mistletoe Viscum album. They are highly toxic towards phytopathogenic fungi and cancer cells. Heterologous expression of viscotoxins would broaden the spectrum of methods to be applied for better understanding of their structure and function

Viscum album agglutinin-I induces apoptosis and degradation of cytoskeletal proteins via caspases in human leukaemia eosinophil AML14.3D10 cells: differences with purified human eosinophils.

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Although there are several agents that induce neutrophil apoptosis, few are known as inducers of eosinophil apoptosis. As eosinophils are potent effector cells contributing to allergic inflammation and asthma, we investigated whether the pro-apoptotic agent Viscum album agglutinin-I (VAA-I) could

Homology of functionally diverse proteins.

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Disulphide-rich proteins of widely differing functions were aligned with the aid of their half-cystinyl residues. This led to the grouping of ribonuclease, phospholipase A, lysozyme, snake venom toxins, bee and scorpion venom peptides, and the plant proteins potatoe carboxypeptidase inhibitor,

Modulation of programmed cell death by medicinal plants.

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Programmed cell death (apoptosis), a form of cell death, described by Kerr and Wyllie some 20 years ago, has generated considerable interest in recent years. The mechanisms by which this mode of cell death (seen both in animal and plant cells), takes place have been examined in detail. Extracellular

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