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pokeweed antiviral protein/leucemia

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Leukemia cells were mixed with normal human bone marrow cells to simulate bone marrow from leukemia patients; the mixture was then treated with a combination of stabilized derivative of cyclophosphamide [Mafosfamide (ASTA Z 7557)] and pokeweed antiviral protein-containing immunotoxin. The ability of
The study of central nervous system (CNS) leukemia has been hampered by the lack of a suitable animal model. We report that severe combined immunodeficiency (SCID) mice invariably develop rapidly progressive fatal CNS leukemia within 3 weeks after intravenous injection of NALM-6 pre-B acute
B-cell precursor (BCP) leukemia is the most common form of childhood cancer and represents one of the most radiation-resistant forms of human malignancy. In this study, we examined the antileukemic efficacy of the B43 (anti-CD19)-pokeweed antiviral protein (B43-PAP) immunotoxin against
Human acute leukemia, with a chromosomal translocation involving chromosomes 4 and 11, t(4;11)(q21;q23), is the most common form of leukemia in infants and responds very poorly to conventional therapy. A human CD19+ mixed-lineage leukemia cell line with a t(4;11)(q21;q23) translocation, RS4;11,

In vivo efficacy of B43 (anti-CD19)-pokeweed antiviral protein immunotoxin against BCL-1 murine B-cell leukemia.

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We show that a highly aggressive subclone of murine BCL-1 B-lineage leukemia expresses a single 2.4-kb transcript hybridizing to the human CD19 cDNA probe and reacts strongly with the anti-human CD19 monoclonal antibodies (MoAb) B43, B4, Leu-12, and J3-119. In contrast to their strong reactivity
Mice with severe combined immunodeficiency (SCID) were injected with 1 x 10(7) MOLT-3 human T-lineage acute lymphoblastic leukemia cells to provide a model for the evaluation of anti-CD7-pokeweed antiviral protein (PAP) immunotoxin directed against the human CD7 antigen. Of control SCID mice
Human mixed lineage leukemia cell line RS4;11 with the t(4;11)(q21;q23) translocation causes disseminated and invariably fatal leukemia in mice with severe combined immunodeficiency. Whereas an immunotoxin constructed from the murine anti-CD19(B43) monoclonal antibody and the plant toxin pokeweed
We report a novel colony assay for B-lineage progenitor cells in acute lymphoblastic leukemia (ALL). The primary plating efficiency of blast progenitors freshly obtained from common B-lineage ALL patients varied between 0.09 and 2.63%. Morphological, cytochemical, and immunological analyses of cells
A highly aggressive human CALLA+C mu+ pre-B acute lymphoblastic leukemia (ALL) cell line (NALM-6-UM1) causes disseminated and invariably fatal leukemia in CB.17 mice with severe combined immunodeficiency (SCID). We used this SCID mouse model of human pre-B ALL to evaluate and compare, in a total of

Suppression of human T-cell leukemia virus I gene expression by pokeweed antiviral protein.

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Human T-cell leukemia virus I (HTLV-I) is a deltaretrovirus that is the causative agent of adult T-cell leukemia and the neurological disorder HTLV-I-associated myelopathy/tropical spastic paraparesis. Currently, no effective antiretroviral treatment options are available to restrict the development
A highly aggressive subclone of the human CALLA+C mu+ pre-B acute lymphoblastic leukemia (ALL) cell line NALM-6 (designated NALM-6-UM1) caused disseminated and fatal leukemia in CB.17 mice with severe combined immunodeficiency (SCID). An intravenous challenge with 1 x 10(6) (NALM-6-UM1 cells caused

Inhibition of human acute lymphoblastic leukemia cells by immunotoxins: potentiation by chloroquine.

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Immunotoxins containing pokeweed antiviral protein and monoclonal antibodies against human T cells or human transferrin receptor efficiently killed acute lymphoblastic leukemia cells. Chloroquine specifically enhanced the rate of protein synthesis inhibition by immunotoxin. Depending on its
Pokeweed antiviral protein (PAP) and ricin A chain are potent inhibitors of protein synthesis that inactivate eukaryotic 60S ribosomal subunits. Immunotoxins were prepared by linking monoclonal anti-Thy 1.1 antibodies to PAP and ricin A chain through a disulfide bond. Both the conjugates were shown
Ricin A chain and pokeweed antiviral protein (PAP), two enzymes that inhibit the action of eukaryotic ribosomes, were coupled by cleavable, N-succinimidyl-3-(2-pyridyldithio)propionate, and noncleavable m-maleimidobenzoyl-N-hydroxysuccinimide ester, cross-linking reagents to monoclonal antibodies

In vivo toxicity, pharmacokinetics, and antileukemic activity of TXU (anti-CD7)-pokeweed antiviral protein immunotoxin.

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We evaluated the TXU (anti-CD7)-pokeweed antiviral protein (PAP) immunotoxin in both murine and nonhuman primate models. TXU-PAP caused dose-limiting cardiac toxicity in BALB/c mice. In a SCID mouse model of invariably fatal human T-lineage acute lymphoblastic leukemia (ALL), TXU-PAP therapy
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