title: An antibody-toxin conjugate directed against a human mammary cancer antigen.
abstract: A conjugate has been constructed consisting of diphtheria toxin fragment A (DTA) linked to a monoclonal antibody, BLMRL-HMFG-Mc5 (MC5), directed against a mammary cancer antigen. The conjugate retains both binding and DTA enzymatic activity when tested against target MCF-7 cells, although the conjugate binds less well than the unconjugated antibody. The conjugate is toxic to MCF-7 cells. Toxicity is both dose- and time-dependent. Half-maximal toxicity is observed with 2-5 X 10(-8) M conjugate after 5 days of incubation. However, the conjugate need only be in contact with the cells for 1 day in order to effect complete killing by 5 days. The earliest that an effect can be seen on cell growth is 2 days. When tested against WRK-1 rat mammary tumor cells, the conjugate is inactive.
authors.forename: M E
authors.initials: ME
authors.lastname: Monaco
authors.forename: J
authors.initials: J
authors.lastname: Mack
authors.forename: M D
authors.initials: MD
authors.lastname: Dugan
authors.forename: R
authors.initials: R
authors.lastname: Ceriani
mesh_terms: D000906:Antibodies; D000918:Antibody Specificity; D000951:Antigens, Neoplasm / Q000276:immunology*; D001943:Breast Neoplasms / Q000276:immunology*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002850:Chromatography, Gel; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D012276:Ricin; D013997:Time Factors
chemical_list: D000906:Antibodies; D000951:Antigens, Neoplasm; D012276:Ricin