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    • 1. 发明申请
    • FORMULATION OF MULTIVALENT ANTIBODY CONSTRUCTS AND USE OF SAME FOR CANCER THERAPY
    • 多发性抗体构建物的配方及其用于癌症治疗的用途
    • WO2006037229A1
    • 2006-04-13
    • PCT/CA2005/001535
    • 2005-10-06
    • BC CANCER AGENCYCHIU, GigiBALLY, Marcel
    • CHIU, GigiBALLY, Marcel
    • A61K39/395G01N33/53A61K47/48A61K9/127
    • G01N33/5011A61K9/1271A61K47/6849A61K47/6867A61K47/6913C07K16/2896C07K16/32G01N33/5047G01N33/6854
    • The invention relates to the formation of multivalent antibody constructs for testing and therapeutic purposes. In one embodiment the constructs consist of antibodies or antibody fragments conjugated to liposomes. The constructs are employed in a cell-based in vitro assay for comparing the therapeutic activity of antibodies or antibody fragments in multivalent form to the same antibodies or fragments in bivalent, free form. The assay is useful for identifying antibodies having potential in vivo activity. Selected antibodies may then be tested in an animal model of a disease state, such as cancer or an autoimmune disorder. Co-delivery of antibodies and chemotherapeutics may also be investigated. In accordance with the invention, a significant enhancement in the activity of antibodies such as trastuzumab and rituximab was observed when these antibodies were presented in the multivalent liposomal form. Key cell survival signaling molecules were down-regulated upon treatment with the multivalent liposomal antibody construct. The invention demonstrates the potential of liposome technology to enhance the therapeutic effect of antibodies via a mechanism that modulates cell survival, likely through clustering of target/antibody complex.
    • 本发明涉及用于测试和治疗目的的多价抗体构建体的形成。 在一个实施方案中,构建体由与脂质体缀合的抗体或抗体片段组成。 将构建体用于基于细胞的体外测定,用于将抗体或多价形式的抗体片段的治疗活性与二价,游离形式的相同抗体或片段进行比较。 该测定可用于鉴定具有潜在的体内活性的抗体。 然后可以在疾病状态的动物模型(例如癌症或自身免疫性疾病)中测试所选择的抗体。 也可以研究抗体和化学治疗剂的共同递送。 根据本发明,当以多价脂质体形式存在这些抗体时,观察到抗体如曲妥珠单抗和利妥昔单抗的活性显着增强。 用多价脂质体抗体构建体治疗时,关键细胞存活信号分子被下调。 本发明证明了脂质体技术通过调节细胞存活的机制来增强抗体的治疗效果,可能通过聚合目标/抗体复合物来增强抗体的治疗效果。
    • 3. 发明申请
    • LIPOSOMES WITH IMPROVED DRUG RETENTION FOR TREATMENT OF CANCER
    • 具有改善药物治疗癌症的药物
    • WO2006037230A1
    • 2006-04-13
    • PCT/CA2005/001536
    • 2005-10-06
    • BC CANCER AGENCYBALLY, MarcelRAMSAY, Euan
    • BALLY, MarcelRAMSAY, Euan
    • A61K47/02
    • A61K9/127A61K31/4745A61K47/02
    • The present invention relates to the use of copper ions to achieve enhanced retention of a therapeutic agent within a liposome. The invention may be employed to more effectively deliver a liposomally encapsulated therapeutic agent to a target site in vitro and in vivo for anti-cancer or other therapy. The liposome may comprise an interior buffer solution containing the therapeutic agent, the solution having a pH less than 6.5 and most preferably approximating pH 3.5. At least some of the copper ions are retained within the interior solution. In a particular embodiment the therapeutic agent may be a chemotherapeutic drug, such as irinotecan. The invention may also comprise an ionophore to facilitate loading of drug into the liposome. In one particular embodiment the combination of the ionophore A23187 and encapsulated divalent copper (Cu2+) resulted in an irinotecan formulation that exhibited surprisingly improved drug retention attributes.
    • 本发明涉及使用铜离子来实现治疗剂在脂质体内的保留。 本发明可用于在体外和体内更有效地将脂质体包封的治疗剂递送至靶位点用于抗癌或其它治疗。 脂质体可以包含含有治疗剂的内部缓冲溶液,该溶液的pH小于6.5,最优选接近pH 3.5。 至少一些铜离子保留在内部溶液中。 在一个具体实施方案中,治疗剂可以是化学治疗药物,例如伊立替康。 本发明还可以包含离子载体以便于将药物负载到脂质体中。 在一个具体实施方案中,离子载体A23187和包封的二价铜(Cu 2+)的组合导致伊立替康制剂显示惊人的改善的药物保留性质。