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dc.contributor.authorPietersz, Geoffrey Aen
dc.contributor.authorWenjun, Len
dc.contributor.authorSutton, V Ren
dc.contributor.authorBurgess, John Ren
dc.contributor.authorMcKenzie, Ian F Cen
dc.contributor.authorZola, Hen
dc.contributor.authorTrapani, Joseph Aen
dc.identifier.citationCancer Immunology, Immunotherapy : Cii; 41(1): 53-60en
dc.description.abstractMouse monoclonal antibodies to CD19 detect an antigenic determinant expressed exclusively on the surface of B lymphocytes, and have previously been shown to be potentially useful therapeutic reagents for human B cell lymphoma. We report the production and characterization of a mouse/human chimeric antibody, cCD19, with potent in vivo antitumour activity. The genes encoding the variable domains for heavy (VH) and light (VL) chains were subcloned into eukaryotic expression vectors containing human constant region genes (IgG1 and kappa), and co-transfected into non-secreting Sp2/0 mouse myeloma cells. Intraperitoneal administration of cCD19 produced inhibition of growth of subcutaneous CD19+ Sultan human B lymphoma tumours in scid/scid mice. When the antibody was administered 18 and 20 days after subcutaneous tumour inoculation, an approximately 30% reduction in tumour size was noted by day 29. cCD19 faithfully mimicked the in vitro binding characteristics of mCD19 as (a) the chimeric antibody was shown by flow cytometry to bind exclusively to cell lines that expressed CD19, (b) cCD19 was able to inhibit the binding of mCD19 on CD19+ cells completely and (c) the affinity of binding of the two antibodies was not significantly different [Ka = (2.03 +/- 1.5) x 10(8)]. In bio-distribution studies, up to 14.8% of the total injected antibody dose per gram of tissue was localized in CD19+ Sultan tumours at 24 h approximately, 14.4% was present in the tumors at 48 h, and about 13.7% at 72 h. These levels were comparable to mCD19 administered in the same fashion. cCD19 conjugated to idarubicin was specifically and strongly cytotoxic to CD19+ cells cultured in vitro, and demonstrated an IC50 of 0.17 microM, similar to that of mCD19 (0.32 microM) and approximately 14-fold greater than the IC50 of free idarubicin. The specific cytotoxic capacity of cCD19 and its likely reduced immunogenicity suggest that it may potentially be of use in the treatment of refractory B cell lymphoma in humans.en
dc.subject.otherAntibodies, Monoclonal.immunologyen
dc.subject.otherAntigen-Antibody Reactionsen
dc.subject.otherAntigens, CD.immunologyen
dc.subject.otherAntigens, CD19en
dc.subject.otherAntigens, Differentiation, B-Lymphocyte.immunologyen
dc.subject.otherIdarubicin.administration & dosageen
dc.subject.otherImmunity, Cellularen
dc.subject.otherImmunoconjugates.administration & dosageen
dc.subject.otherMice, SCIDen
dc.subject.otherRecombinant Fusion Proteinsen
dc.subject.otherTumor Cells, Cultured.immunologyen
dc.titleIn vitro and in vivo antitumor activity of a chimeric anti-CD19 antibody.en
dc.typeJournal Articleen
dc.identifier.journaltitleCancer immunology, immunotherapy : CIIen
dc.identifier.affiliationAustin Research Institute, Austin Hospital, Heidelberg, Victoria, Australiaen
dc.type.austinJournal Articleen
item.openairetypeJournal Article-
item.fulltextNo Fulltext-
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