title: Herceptin-platinum(II) binding complexes: novel cancer-cell-specific agents.
abstract: We report a new series of Herceptin-platinum(II) binding complexes, Her-nLPt(II) (Her denotes Herceptin; L denotes diamino ligands and L=L1-L4; n=1, 5, or 10). Solution chemistry studies have shown that these complexes are stable under physiological conditions (pH 7.4 in PBS). The platinum(II) compound L1Pt(II)Cl(2) inhibits the growth of a panel of human cancer cell lines at sub-micromolar concentrations. Remarkable cancer-cell-specific cytotoxicity was observed with Her-nL1Pt(II) (n=1, 5, 10) toward Her2/neu-overexpressing cancer cells (SK-BR-3 and SK-OV-3) over normal fibroblast cells. Annexin V apoptosis assays in SK-BR-3 and low-Her2/neu-expressing MCF-7 breast cancer cells further confirmed the critical role of Herceptin with this cancer-cell-specific agent. It was also found that the L1Pt(II)Cl(2) complex is an efficient regulator of the apoptotic genes Bcl-2 in the treated SK-BR-3 cells. Also, enhanced regulatory effects were observed in Her-10L1Pt(II). Taken together, this study suggests a new approach for the development of mAb-platinum(II)-based targeting agents for the treatment of human cancers.
authors: Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA. gaojiantamu@yahoo.com
authors: Jian
authors: J
authors: Gao
authors: Ya Guang
authors: YG
authors: Liu
authors: Renbin
authors: R
authors: Liu
authors: Ralph A
authors: RA
authors: Zingaro
mesh_terms: D000911:Antibodies, Monoclonal / Q000737:chemistry* / Q000494:pharmacology*; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D008968:Molecular Conformation; D009944:Organoplatinum Compounds / Q000737:chemistry* / Q000494:pharmacology*; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors; D015203:Reproducibility of Results; D013237:Stereoisomerism; D000068878:Trastuzumab
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents; D009944:Organoplatinum Compounds; D018719:Erb-b2 Receptor Tyrosine Kinases; D000068878:Trastuzumab